# Best Voice AI for Developers (2026)

> The best Voice AI platforms for developers: LiveKit Agents leads, for custom pipeline control for engineering teams. Verified pricing and per-use-case verdicts.

For developers, **LiveKit Agents** is our pick (from $0.01/min): For engineering teams needing custom pipeline control, LiveKit Agents wins decisively. Custom pipeline control for engineering teams. Below is the full ranking and the tradeoffs, or read [how we score](https://www.versusref.com/methodology/).

## What matters for custom pipeline control

Weight ×5 = decisive, ×1 = relevant.

| Fact | Weight | LiveKit Agents | Vapi | ElevenLabs Agents | Vocode | Hume EVI |
| --- | --- | --- | --- | --- | --- | --- |
| Bring-your-own LLM | ×5 | ✓  Yes (Jul 15) | ✓  Yes (Jul 15) | n/a | ✓  Yes (Jul 15) | ✓  Yes (Jul 30) |
| API-first (full lifecycle via API) | ×5 | ✓  Yes (Jul 15) | ✓  Yes (Jul 15) | ✓  Yes (Jul 15) | ✓  Yes (Jul 15) | ✓  Yes (Jul 30) |
| Median e2e latency | ×4 | n/a | ~600 ms (Jul 15) | ~75 ms (Jul 15) | n/a | ~300 ms (Jul 30) |
| Bring-your-own TTS voice | ×4 | ✓  Yes (Jul 15) | ✓  Yes (Jul 15) | n/a | ✓  Yes (Jul 15) | ✓  Yes (Jul 30) |
| Native SIP trunking | ×3 | ✓  Yes (Jul 15) | ✓  Yes (Jul 15) | n/a | ✓  Yes (Jul 15) | n/a |
| Simulation/testing suite for agents | ×3 | n/a | ✓  Yes (Jul 15) | n/a | n/a | n/a |

- ×5 **Bring-your-own LLM:** Model choice is the first thing engineering teams customize.
- ×5 **API-first (full lifecycle via API):** The full agent lifecycle has to be scriptable, not dashboard-bound.
- ×4 **Median e2e latency:** Voice-to-voice latency is the ceiling on conversation quality.
- ×4 **Bring-your-own TTS voice:** Swapping TTS vendors is a routine cost/quality lever.
- ×3 **Native SIP trunking:** Native SIP avoids a second telephony vendor in the stack.
- ×3 **Simulation/testing suite for agents:** Simulation tooling gates safe iteration in production.

## The ranking, tool by tool

| Rank | Tool | Verdict | Score | Price |
| --- | --- | --- | --- | --- |
| 1 | [LiveKit Agents](https://www.versusref.com/voice-ai/tools/livekit-agents/) (OSS) | For engineering teams needing custom pipeline control, LiveKit Agents wins decisively. | 5.5 of 8 points · 4 matchups | From $0.01/min |
| 2 | [Vapi](https://www.versusref.com/voice-ai/tools/vapi/) | Both tools support bring-your-own LLM and a full API-first lifecycle, so those critical capabilities are matched. | 16 of 32 points · 16 matchups | From $0.05/min |
| 3 | [ElevenLabs Agents](https://www.versusref.com/voice-ai/tools/elevenlabs-agents/) | For engineering teams building custom pipelines, bring-your-own LLM support and API-first control are the deciding factors. | 8 of 16 points · 8 matchups | From $0.05/min |
| 4 | [Vocode](https://www.versusref.com/voice-ai/tools/vocode/) (OSS) | Both tools are API-first, support BYO LLM and BYO voice, and offer native SIP trunking, making them closely matched for engineering pipeline control. | 3 of 6 points · 3 matchups | See pricing |
| 5 | [Hume EVI](https://www.versusref.com/voice-ai/tools/hume-evi/) | For engineering teams building custom pipelines, the two most critical capabilities are bring-your-own LLM and full API-first control. | 2 of 4 points · 2 matchups | From $0.07/min |
| 6 | [Parloa](https://www.versusref.com/voice-ai/tools/parloa/) | For engineering teams building custom pipelines, the ability to swap in your own LLM and voice model are critical control points. | 2 of 4 points · 2 matchups | See pricing |
| 7 | [Level AI](https://www.versusref.com/voice-ai/tools/level-ai/) | For engineering teams building custom pipelines, simulation and testing capabilities are critical infrastructure. | 1 of 2 points · 1 matchup | See pricing |
| 8 | [Patter](https://www.versusref.com/voice-ai/tools/patter/) (OSS) | For engineering teams building custom pipelines, the ability to bring your own LLM and full API-first control are the deciding factors, and both Patter and Pipecat deliver on both counts. | 1 of 2 points · 1 matchup | See pricing |
| 9 | [Salient](https://www.versusref.com/voice-ai/tools/salient/) | For engineering teams building custom pipelines, API-first access is the foundation that everything else rests on. | 1 of 2 points · 1 matchup | See pricing |
| 10 | [Sierra](https://www.versusref.com/voice-ai/tools/sierra/) | For engineering teams building custom pipelines, iteration speed depends heavily on a simulation and testing suite. | 1 of 2 points · 1 matchup | See pricing |
| 11 | [Telnyx Voice AI Agents](https://www.versusref.com/voice-ai/tools/telnyx-voice-ai/) | For engineering teams building custom pipelines, the ability to plug in your own LLM and drive every lifecycle step through an API are the deciding factors. | 1 of 2 points · 1 matchup | From $0.05/min |
| 12 | [Bland AI](https://www.versusref.com/voice-ai/tools/bland/) | Both tools are API-first, but Bland AI adds native SIP trunking, a $0/mo platform fee (versus Voiceflow's estimated $60/mo), a 99.9% uptime SLA on all plans, and telephony at $0.00/min passthrough. | 7 of 18 points · 9 matchups | From $0.14/min |
| 13 | [Retell AI](https://www.versusref.com/voice-ai/tools/retell/) | For engineering teams needing custom pipeline control, Retell AI offers native SIP trunking, DTMF/IVR navigation, bring-your-own LLM, bring-your-own TTS voice, and a $0/mo platform fee with no annual contract required. | 7 of 20 points · 10 matchups | From $0.07/min |
| 14 | [Dasha](https://www.versusref.com/voice-ai/tools/dasha/) | Both tools are API-first and support full lifecycle management via API. | 2 of 8 points · 4 matchups | From $0.08/min |
| 15 | [Thoughtly](https://www.versusref.com/voice-ai/tools/thoughtly/) | For engineering teams needing custom pipeline control, API-first access is decisive. | 2 of 8 points · 4 matchups | From $500/mo |
| 16 | [Avoca](https://www.versusref.com/voice-ai/tools/avoca/) | AI workforce platform for the home-services trades (voice, chat, outbound, and call coaching). | 1 of 4 points · 2 matchups | See pricing |
| 17 | [Cresta](https://www.versusref.com/voice-ai/tools/cresta/) | Generative AI platform unifying autonomous AI Agent, Agent Assist, and Conversation Intelligence for enterprise contact centers. | 1 of 4 points · 2 matchups | See pricing |
| 18 | [PolyAI](https://www.versusref.com/voice-ai/tools/polyai/) | For engineering teams wanting custom pipeline control, the ability to drive every step via API and to manage latency are the deciding factors. | 1 of 4 points · 2 matchups | See pricing |
| 19 | [Smith.ai](https://www.versusref.com/voice-ai/tools/smith-ai/) | Human+AI hybrid receptionist platform with per-call bundle pricing; 500+ live agent network, law-firm-heavy customer base. | 1 of 4 points · 2 matchups | From $150/mo |
| 20 | [STELLA Automotive AI](https://www.versusref.com/voice-ai/tools/stella-automotive/) | Dealership-focused conversational AI platform with certified DMS integrations (CDK, Reynolds, Tekion) and dealer/industry investors incl. Reynolds & Reynolds board representation. | 1 of 4 points · 2 matchups | See pricing |
| 21 | [Toma](https://www.versusref.com/voice-ai/tools/toma/) | "AI Coworkers for the Automotive Enterprise" - dealership call automation with production safeguards, YC/a16z-backed. | 1 of 4 points · 2 matchups | See pricing |
| 22 | [Abby Connect](https://www.versusref.com/voice-ai/tools/abby-connect/) | Legacy virtual-receptionist provider (est. 2005) adding a lower-cost AI tier with built-in human backup; minute-bundle pricing on both lines. | 0.5 of 2 points · 1 matchup | From $99/mo |
| 23 | [Alex (fka Apriora)](https://www.versusref.com/voice-ai/tools/alex/) | 'Interview everyone. Hire the best.' - autonomous AI interviewer (voice + video) for high-volume hiring, operated by Apriora Inc. dba Alex. | 0.5 of 2 points · 1 matchup | See pricing |
| 24 | [Arini](https://www.versusref.com/voice-ai/tools/arini/) | The AI front desk for dental groups and DSOs - zero missed calls, 24/7. | 0.5 of 2 points · 1 matchup | See pricing |
| 25 | [ASAPP](https://www.versusref.com/voice-ai/tools/asapp/) | Generative AI CX platform whose GenerativeAgent overlays existing CCaaS stacks to automate voice and messaging interactions. | 0.5 of 2 points · 1 matchup | See pricing |
| 26 | [Assort Health](https://www.versusref.com/voice-ai/tools/assort-health/) | Specialty-specific AI agents for the full patient journey (access, intake, referrals, outreach). | 0.5 of 2 points · 1 matchup | See pricing |
| 27 | [Brooke.ai](https://www.versusref.com/voice-ai/tools/brooke-ai/) | OEM-channel digital voice assistant for fixed ops - a sub-brand of Proactive Dealer Solutions (Better Car People), sold through programs like Stellantis MarketCenter rather than as a standalone startup. | 0.5 of 2 points · 1 matchup | See pricing |
| 28 | [ConverzAI](https://www.versusref.com/voice-ai/tools/converzai/) | 'World's Leading Automation for Staffing Firms' - agentic virtual recruiters covering the pipeline from sourcing to placement, staffing-agency (not corporate HR) focus. | 0.5 of 2 points · 1 matchup | See pricing |
| 29 | [Deepgram Voice Agent API](https://www.versusref.com/voice-ai/tools/deepgram-voice-agent-api/) | Unified STT + LLM orchestration + TTS voice-agent pipeline at a flat all-in rate ($4.50/hr), with BYO-LLM/TTS discounts and enterprise deployment options. | 0.5 of 2 points · 1 matchup | From $0.07/min |
| 30 | [Dentina](https://www.versusref.com/voice-ai/tools/dentina/) | The AI dental receptionist built by a dentist - 24/7 inbound/outbound calls with real-time PMS write-back. | 0.5 of 2 points · 1 matchup | From $299/mo |
| 31 | [Dialzara](https://www.versusref.com/voice-ai/tools/dialzara/) | Lowest-entry-price SMB AI receptionist with minute-bundle pricing and SMS/chatbot/outbound add-ons. | 0.5 of 2 points · 1 matchup | From $0.48/min |
| 32 | [Goodcall](https://www.versusref.com/voice-ai/tools/goodcall/) | Agentic voice AI for SMB service businesses; unusual per-unique-customer metering with unlimited minutes ('born at Google'). | 0.5 of 2 points · 1 matchup | From $79/mo |
| 33 | [Hello Patient](https://www.versusref.com/voice-ai/tools/hello-patient/) | Conversational AI for healthcare's 'front door' - voice, SMS, and chat patient communication. | 0.5 of 2 points · 1 matchup | See pricing |
| 34 | [Kore.ai](https://www.versusref.com/voice-ai/tools/kore-ai/) | Enterprise agentic AI platform (Artemis) with voice AI agents for contact-center self-service at Global 2000 scale. | 0.5 of 2 points · 1 matchup | See pricing |
| 35 | [Loman AI](https://www.versusref.com/voice-ai/tools/loman/) | Restaurant voice AI with deep POS order-writing (Toast/Square/Clover/Olo etc.) - orders and payments, not just reservations and FAQs. | 0.5 of 2 points · 1 matchup | See pricing |
| 36 | [Netic](https://www.versusref.com/voice-ai/tools/netic/) | Autonomous AI revenue engine for essential home services. | 0.5 of 2 points · 1 matchup | See pricing |
| 37 | [Numa](https://www.versusref.com/voice-ai/tools/numa/) | AI operating system for the AI-native dealership - voice AI plus agentic follow-up (Heat Case, Opportunity, Service Advisor agents) for franchise dealers and multi-rooftop groups. | 0.5 of 2 points · 1 matchup | See pricing |
| 38 | [Replicant](https://www.versusref.com/voice-ai/tools/replicant/) | Voice-native contact-center automation with deterministic reasoning for business rules and 1B+ minutes of production conversation data. | 0.5 of 2 points · 1 matchup | See pricing |
| 39 | [Sameday](https://www.versusref.com/voice-ai/tools/sameday/) | Trades-focused AI sales agent - sells and books jobs (claims 92%+ booking rate, voice cloning of your staff) rather than just taking messages. | 0.5 of 2 points · 1 matchup | From $449/mo |
| 40 | [Slang AI](https://www.versusref.com/voice-ai/tools/slang-ai/) | Hospitality-native voice AI ('Superhost') priced per location - reservation-system depth and guest recognition rather than generic receptionist features. | 0.5 of 2 points · 1 matchup | From $399/mo |
| 41 | [Upfirst](https://www.versusref.com/voice-ai/tools/upfirst/) | Per-call-bundle AI receptionist with 35+ languages and declining overage rates up to 600 calls/mo. | 0.5 of 2 points · 1 matchup | From $24.95/mo |
| 42 | [Zoom Virtual Agent Receptionist](https://www.versusref.com/voice-ai/tools/zoom-virtual-agent-receptionist/) | Big-tech price anchor for the receptionist segment: standalone AI receptionist at $29.99/mo (100 min), launched 2026-07-09; also bundled free with Zoom Phone. | 0.5 of 2 points · 1 matchup | From $29.99/mo |
| 43 | [Phonely](https://www.versusref.com/voice-ai/tools/phonely/) | For engineering teams building custom voice pipelines, API completeness and low-level infrastructure control are the deciding factors. | 2 of 10 points · 5 matchups | From $0.05/min |
| 44 | [Pipecat](https://www.versusref.com/voice-ai/tools/pipecat/) (OSS) | Open-source Python framework for real-time voice and multimodal conversational agents, maintained by Daily, with Pipecat Cloud as the managed production runtime. | 1 of 6 points · 3 matchups | From $0.01/min |
| 45 | [Millis AI](https://www.versusref.com/voice-ai/tools/millis/) | Both tools are API-first and support BYO voice, but Millis AI adds bring-your-own LLM support (b03a3392), giving engineering teams direct control over the model layer, a key requirement for custom pipelines. | 1 of 8 points · 4 matchups | From $0.02/min |
| 46 | [OpenAI Realtime API](https://www.versusref.com/voice-ai/tools/openai-realtime-api/) | Both tools are API-first and neither supports bring-your-own LLM, so those critical pipeline-control factors cancel out. | 1 of 8 points · 4 matchups | See pricing |
| 47 | [Voiceflow](https://www.versusref.com/voice-ai/tools/voiceflow/) | Both tools are API-first and offer no-code builders, but Voiceflow adds capabilities specifically useful for engineering teams building custom pipelines: bring-your-own LLM support lets teams plug in their own models, a simulation and testing suite enables pipeline validation, and white-label sub-accounts support multi-tenant architectures. | 1 of 8 points · 4 matchups | From $0.05/min |
| 48 | [Cognigy (NiCE)](https://www.versusref.com/voice-ai/tools/cognigy/) | Agentic AI platform for CX (Cognigy.AI + Voice Gateway); Forrester Wave 2026 Leader, sold standalone and inside NiCE CXone Mpower. | 0.5 of 4 points · 2 matchups | See pricing |
| 49 | [Rosie](https://www.versusref.com/voice-ai/tools/rosie/) | Self-serve SMB AI answering service with bundled-minute pricing and bilingual EN/ES on every plan. | 0.5 of 4 points · 2 matchups | From $49/mo |
| 50 | [Decagon](https://www.versusref.com/voice-ai/tools/decagon/) | AI concierge platform - voice/chat/email agents driven by natural-language Agent Operating Procedures (AOPs). | 0 of 2 points · 1 matchup | See pricing |
| 51 | [Dograh](https://www.versusref.com/voice-ai/tools/dograh/) (OSS) | Self-hostable open-source voice agent platform ('OSS alternative to Vapi & Retell') with a no-code workflow builder and air-gapped on-prem deployment for regulated industries. | 0 of 2 points · 1 matchup | See pricing |
| 52 | [Domu](https://www.versusref.com/voice-ai/tools/domu/) | YC S24 collections-automation platform for financial institutions across the Americas - 'compliance is not a checkbox, it is the architecture'. | 0 of 2 points · 1 matchup | See pricing |
| 53 | [Google Gemini Live API](https://www.versusref.com/voice-ai/tools/gemini-live-api/) | Native-audio speech-to-speech model API (Gemini Live) with barge-in, affective dialog, and tool use over a stateful WebSocket. | 0 of 2 points · 1 matchup | From $0.02/min |
| 54 | [Observe.AI](https://www.versusref.com/voice-ai/tools/observe-ai/) | Contact-center AI platform expanding from conversation intelligence into autonomous VoiceAI agents (inbound and outbound) with copilots for frontline teams. | 0 of 2 points · 1 matchup | See pricing |
| 55 | [Omilia](https://www.versusref.com/voice-ai/tools/omilia/) | Conversational AI platform for contact-center voice/IVR automation, with native 'Lexis' voice synthesis and agentic voice/chat agents. | 0 of 2 points · 1 matchup | See pricing |
| 56 | [Ringly.io](https://www.versusref.com/voice-ai/tools/ringly/) | Ecommerce phone agents. | 0 of 8 points · 4 matchups | From $0.29/min |
| 57 | [Twilio ConversationRelay](https://www.versusref.com/voice-ai/tools/twilio-conversationrelay/) | Carrier-grade voice harness for BYO-LLM agents inside Twilio Programmable Voice. | 0 of 4 points · 2 matchups | From $0.07/min |
| 58 | [Ultravox](https://www.versusref.com/voice-ai/tools/ultravox/) | Realtime speech model + platform. | 0 of 8 points · 4 matchups | From $0.05/min |

### 1. LiveKit Agents

For engineering teams needing custom pipeline control, LiveKit Agents wins decisively. [Full LiveKit Agents vs Vapi verdict](https://www.versusref.com/voice-ai/livekit-agents-vs-vapi/)

For engineering teams needing custom pipeline control, LiveKit Agents is API-first and passes through LLM and TTS costs at cost, giving engineers direct control over every component without markup or abstraction layers. [Full LiveKit Agents vs Retell AI verdict](https://www.versusref.com/voice-ai/livekit-agents-vs-retell/)

For engineering teams needing custom pipeline control, LiveKit Agents supports bring-your-own LLM and passes through LLM and TTS costs at cost, giving engineers full control over model selection and cost transparency. [Full LiveKit Agents vs Bland AI verdict](https://www.versusref.com/voice-ai/bland-vs-livekit-agents/)

### 2. Vapi

Both tools support bring-your-own LLM and a full API-first lifecycle, so those critical capabilities are matched. [Full Vapi vs Twilio ConversationRelay verdict](https://www.versusref.com/voice-ai/twilio-conversationrelay-vs-vapi/)

Both platforms support bring-your-own LLM and are fully API-first, so those critical capabilities are matched. [Full Vapi vs Hume EVI verdict](https://www.versusref.com/voice-ai/hume-evi-vs-vapi/)

Both platforms support bring-your-own LLM and bring-your-own TTS voice, so engineering teams get full model flexibility either way. [Full Vapi vs Dograh verdict](https://www.versusref.com/voice-ai/dograh-vs-vapi/)

For engineering teams building custom pipelines, the ability to swap in your own LLM and TTS voice are deciding factors. [Full Vapi vs OpenAI Realtime API verdict](https://www.versusref.com/voice-ai/openai-realtime-api-vs-vapi/)

For engineering teams needing custom pipeline control, Vapi's API-first architecture, native SIP trunking, DTMF/IVR support, bring-your-own LLM, bring-your-own TTS, and LLM/TTS cost passthrough at cost give it a more complete low-level control surface. [Full Vapi vs Voiceflow verdict](https://www.versusref.com/voice-ai/vapi-vs-voiceflow/)

For engineering teams needing custom pipeline control, Vapi wins on several developer-facing dimensions. [Full Vapi vs Ultravox verdict](https://www.versusref.com/voice-ai/ultravox-vs-vapi/)

For engineering teams needing custom pipeline control, Vapi is clearly superior. [Full Vapi vs Thoughtly verdict](https://www.versusref.com/voice-ai/thoughtly-vs-vapi/)

For engineering teams needing custom pipeline control, Vapi wins on multiple technical dimensions. [Full Vapi vs Ringly.io verdict](https://www.versusref.com/voice-ai/ringly-vs-vapi/)

For engineering teams needing custom pipeline control, Vapi edges ahead on two key dimensions. [Full Vapi vs Phonely verdict](https://www.versusref.com/voice-ai/phonely-vs-vapi/)

Both tools are API-first with BYO-LLM and BYO-voice support, so core pipeline flexibility is equal. [Full Vapi vs Millis AI verdict](https://www.versusref.com/voice-ai/millis-vs-vapi/)

Both tools are API-first (facts aa673710 and 96c19528), but Vapi offers bring-your-own LLM (ec06e84f), bring-your-own TTS voice (137a4d00), and LLM/TTS cost passthrough (2549ab71), giving engineering teams direct control over every pipeline component. [Full Vapi vs Dasha verdict](https://www.versusref.com/voice-ai/dasha-vs-vapi/)

Both tools are API-first and support BYO-LLM and BYO-voice, but Vapi passes LLM and TTS costs through at cost while Retell bundles them into a fixed rate, giving engineering teams more granular cost control and flexibility. [Full Vapi vs Retell AI verdict](https://www.versusref.com/voice-ai/retell-vs-vapi/)

### 3. ElevenLabs Agents

For engineering teams building custom pipelines, bring-your-own LLM support and API-first control are the deciding factors. [Full ElevenLabs Agents vs OpenAI Realtime API verdict](https://www.versusref.com/voice-ai/elevenlabs-agents-vs-openai-realtime-api/)

Both tools are API-first, but ElevenLabs Agents adds a no-code agent builder (b5a43883) while Ultravox does not (9049ca31), giving engineering teams more flexibility to prototype alongside custom pipeline work. [Full ElevenLabs Agents vs Ultravox verdict](https://www.versusref.com/voice-ai/elevenlabs-agents-vs-ultravox/)

ElevenLabs Agents is API-first, giving engineering teams full programmatic control over the agent lifecycle, while Thoughtly is explicitly not API-first. [Full ElevenLabs Agents vs Thoughtly verdict](https://www.versusref.com/voice-ai/elevenlabs-agents-vs-thoughtly/)

Engineering teams building custom pipelines need API-first access, low latency, bring-your-own-LLM flexibility, and low iteration cost. [Full ElevenLabs Agents vs Ringly.io verdict](https://www.versusref.com/voice-ai/elevenlabs-agents-vs-ringly/)

Both tools offer API-first access, but ElevenLabs Agents has a 75 ms median e2e latency (fact 13b82148) which is critical for engineering teams building custom pipelines where responsiveness matters. [Full ElevenLabs Agents vs Phonely verdict](https://www.versusref.com/voice-ai/elevenlabs-agents-vs-phonely/)

Both tools offer API-first design and no-code builders. [Full ElevenLabs Agents vs Millis AI verdict](https://www.versusref.com/voice-ai/elevenlabs-agents-vs-millis/)

### 4. Vocode

Both tools are API-first, support BYO LLM and BYO voice, and offer native SIP trunking, making them closely matched for engineering pipeline control. [Full Vocode vs Vapi verdict](https://www.versusref.com/voice-ai/vapi-vs-vocode/)

For engineering teams needing custom pipeline control, code-level flexibility and open architecture matter most. [Full Vocode vs Retell AI verdict](https://www.versusref.com/voice-ai/retell-vs-vocode/)

For engineering teams needing custom pipeline control, the key differentiator is how much the platform stays out of the way. [Full Vocode vs Bland AI verdict](https://www.versusref.com/voice-ai/bland-vs-vocode/)

### 5. Hume EVI

For engineering teams building custom pipelines, the two most critical capabilities are bring-your-own LLM and full API-first control. [Full Hume EVI vs OpenAI Realtime API verdict](https://www.versusref.com/voice-ai/hume-evi-vs-openai-realtime-api/)

### 6. Parloa

For engineering teams building custom pipelines, the ability to swap in your own LLM and voice model are critical control points. [Full Parloa vs PolyAI verdict](https://www.versusref.com/voice-ai/parloa-vs-polyai/)

For engineering teams building custom pipelines, the ability to swap in your own LLM is the most critical control point. [Full Parloa vs Cognigy (NiCE) verdict](https://www.versusref.com/voice-ai/cognigy-vs-parloa/)

### 7. Level AI

For engineering teams building custom pipelines, simulation and testing capabilities are critical infrastructure. [Full Level AI vs Observe.AI verdict](https://www.versusref.com/voice-ai/level-ai-vs-observe-ai/)

### 8. Patter

For engineering teams building custom pipelines, the ability to bring your own LLM and full API-first control are the deciding factors, and both Patter and Pipecat deliver on both counts. [Full Patter vs Pipecat verdict](https://www.versusref.com/voice-ai/patter-vs-pipecat/)

### 9. Salient

For engineering teams building custom pipelines, API-first access is the foundation that everything else rests on. [Full Salient vs Domu verdict](https://www.versusref.com/voice-ai/domu-vs-salient/)

### 10. Sierra

For engineering teams building custom pipelines, iteration speed depends heavily on a simulation and testing suite. [Full Sierra vs Decagon verdict](https://www.versusref.com/voice-ai/decagon-vs-sierra/)

### 11. Telnyx Voice AI Agents

For engineering teams building custom pipelines, the ability to plug in your own LLM and drive every lifecycle step through an API are the deciding factors. [Full Telnyx Voice AI Agents vs Twilio ConversationRelay verdict](https://www.versusref.com/voice-ai/telnyx-voice-ai-vs-twilio-conversationrelay/)

### 12. Bland AI

Both tools are API-first, but Bland AI adds native SIP trunking, a $0/mo platform fee (versus Voiceflow's estimated $60/mo), a 99.9% uptime SLA on all plans, and telephony at $0.00/min passthrough. [Full Bland AI vs Voiceflow verdict](https://www.versusref.com/voice-ai/bland-vs-voiceflow/)

Both tools are API-first and self-serve, but Bland AI adds a no-code agent builder (fact 2618ade6) while Ultravox does not (fact 9049ca31), giving engineering teams more flexibility to prototype and iterate pipelines without extra tooling. [Full Bland AI vs Ultravox verdict](https://www.versusref.com/voice-ai/bland-vs-ultravox/)

For engineering teams needing custom pipeline control, Bland AI is API-first (fact 0f83100c), meaning the full lifecycle can be managed programmatically, while Thoughtly is explicitly not API-first (fact 13145dd8). [Full Bland AI vs Thoughtly verdict](https://www.versusref.com/voice-ai/bland-vs-thoughtly/)

Bland AI offers an API-first platform with a no-code builder, native outbound campaigns, DTMF/IVR navigation, barge-in handling, bring-your-own TTS voice, and a $0/mo platform fee compared to Ringly.io's $349/mo. [Full Bland AI vs Ringly.io verdict](https://www.versusref.com/voice-ai/bland-vs-ringly/)

Bland AI is explicitly API-first, covering the full lifecycle with native Twilio and SIP trunk integrations, giving engineering teams granular pipeline control. [Full Bland AI vs Phonely verdict](https://www.versusref.com/voice-ai/bland-vs-phonely/)

### 13. Retell AI

For engineering teams needing custom pipeline control, Retell AI offers native SIP trunking, DTMF/IVR navigation, bring-your-own LLM, bring-your-own TTS voice, and a $0/mo platform fee with no annual contract required. [Full Retell AI vs Voiceflow verdict](https://www.versusref.com/voice-ai/retell-vs-voiceflow/)

For custom pipeline control by engineering teams, Retell AI supports bring-your-own LLM, giving teams direct model control, while Ultravox does not. [Full Retell AI vs Ultravox verdict](https://www.versusref.com/voice-ai/retell-vs-ultravox/)

For engineering teams needing custom pipeline control, Retell AI offers bring-your-own LLM, bring-your-own TTS voice, a full API-first lifecycle, a no-code builder alongside code access, native SIP trunking, DTMF/IVR navigation, and a $0/mo platform fee with $0.07/min base pricing. [Full Retell AI vs Ringly.io verdict](https://www.versusref.com/voice-ai/retell-vs-ringly/)

For engineering teams needing custom pipeline control, Retell AI offers a bring-your-own LLM option, letting teams plug in their own model and fully control the inference pipeline. [Full Retell AI vs Phonely verdict](https://www.versusref.com/voice-ai/phonely-vs-retell/)

Both tools are API-first and support BYO LLM and BYO TTS voice, so core pipeline flexibility is comparable. [Full Retell AI vs Millis AI verdict](https://www.versusref.com/voice-ai/millis-vs-retell/)

Both tools are API-first and support full lifecycle control. [Full Retell AI vs Dasha verdict](https://www.versusref.com/voice-ai/dasha-vs-retell/)

### 14. Dasha

Both tools are API-first and support full lifecycle management via API. [Full Dasha vs ElevenLabs Agents verdict](https://www.versusref.com/voice-ai/dasha-vs-elevenlabs-agents/)

Both tools are API-first and support full lifecycle control via API. [Full Dasha vs Bland AI verdict](https://www.versusref.com/voice-ai/bland-vs-dasha/)

### 15. Thoughtly

For engineering teams needing custom pipeline control, API-first access is decisive. [Full Thoughtly vs Retell AI verdict](https://www.versusref.com/voice-ai/retell-vs-thoughtly/)

### 16. Avoca

AI workforce platform for the home-services trades (voice, chat, outbound, and call coaching). No won verdicts for this use case yet; it ranks on ties and near-misses.

### 17. Cresta

Generative AI platform unifying autonomous AI Agent, Agent Assist, and Conversation Intelligence for enterprise contact centers. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 18. PolyAI

For engineering teams wanting custom pipeline control, the ability to drive every step via API and to manage latency are the deciding factors. [Full PolyAI vs Omilia verdict](https://www.versusref.com/voice-ai/omilia-vs-polyai/)

### 19. Smith.ai

Human+AI hybrid receptionist platform with per-call bundle pricing; 500+ live agent network, law-firm-heavy customer base. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 20. STELLA Automotive AI

Dealership-focused conversational AI platform with certified DMS integrations (CDK, Reynolds, Tekion) and dealer/industry investors incl. Reynolds & Reynolds board representation. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 21. Toma

"AI Coworkers for the Automotive Enterprise" - dealership call automation with production safeguards, YC/a16z-backed. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 22. Abby Connect

Legacy virtual-receptionist provider (est. 2005) adding a lower-cost AI tier with built-in human backup; minute-bundle pricing on both lines. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 23. Alex (fka Apriora)

'Interview everyone. Hire the best.' - autonomous AI interviewer (voice + video) for high-volume hiring, operated by Apriora Inc. dba Alex. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 24. Arini

The AI front desk for dental groups and DSOs - zero missed calls, 24/7. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 25. ASAPP

Generative AI CX platform whose GenerativeAgent overlays existing CCaaS stacks to automate voice and messaging interactions. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 26. Assort Health

Specialty-specific AI agents for the full patient journey (access, intake, referrals, outreach). No won verdicts for this use case yet; it ranks on ties and near-misses.

### 27. Brooke.ai

OEM-channel digital voice assistant for fixed ops - a sub-brand of Proactive Dealer Solutions (Better Car People), sold through programs like Stellantis MarketCenter rather than as a standalone startup. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 28. ConverzAI

'World's Leading Automation for Staffing Firms' - agentic virtual recruiters covering the pipeline from sourcing to placement, staffing-agency (not corporate HR) focus. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 29. Deepgram Voice Agent API

Unified STT + LLM orchestration + TTS voice-agent pipeline at a flat all-in rate ($4.50/hr), with BYO-LLM/TTS discounts and enterprise deployment options. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 30. Dentina

The AI dental receptionist built by a dentist - 24/7 inbound/outbound calls with real-time PMS write-back. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 31. Dialzara

Lowest-entry-price SMB AI receptionist with minute-bundle pricing and SMS/chatbot/outbound add-ons. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 32. Goodcall

Agentic voice AI for SMB service businesses; unusual per-unique-customer metering with unlimited minutes ('born at Google'). No won verdicts for this use case yet; it ranks on ties and near-misses.

### 33. Hello Patient

Conversational AI for healthcare's 'front door' - voice, SMS, and chat patient communication. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 34. Kore.ai

Enterprise agentic AI platform (Artemis) with voice AI agents for contact-center self-service at Global 2000 scale. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 35. Loman AI

Restaurant voice AI with deep POS order-writing (Toast/Square/Clover/Olo etc.) - orders and payments, not just reservations and FAQs. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 36. Netic

Autonomous AI revenue engine for essential home services. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 37. Numa

AI operating system for the AI-native dealership - voice AI plus agentic follow-up (Heat Case, Opportunity, Service Advisor agents) for franchise dealers and multi-rooftop groups. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 38. Replicant

Voice-native contact-center automation with deterministic reasoning for business rules and 1B+ minutes of production conversation data. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 39. Sameday

Trades-focused AI sales agent - sells and books jobs (claims 92%+ booking rate, voice cloning of your staff) rather than just taking messages. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 40. Slang AI

Hospitality-native voice AI ('Superhost') priced per location - reservation-system depth and guest recognition rather than generic receptionist features. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 41. Upfirst

Per-call-bundle AI receptionist with 35+ languages and declining overage rates up to 600 calls/mo. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 42. Zoom Virtual Agent Receptionist

Big-tech price anchor for the receptionist segment: standalone AI receptionist at $29.99/mo (100 min), launched 2026-07-09; also bundled free with Zoom Phone. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 43. Phonely

For engineering teams building custom voice pipelines, API completeness and low-level infrastructure control are the deciding factors. [Full Phonely vs Rosie verdict](https://www.versusref.com/voice-ai/phonely-vs-rosie/)

### 44. Pipecat

Open-source Python framework for real-time voice and multimodal conversational agents, maintained by Daily, with Pipecat Cloud as the managed production runtime. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 45. Millis AI

Both tools are API-first and support BYO voice, but Millis AI adds bring-your-own LLM support (b03a3392), giving engineering teams direct control over the model layer, a key requirement for custom pipelines. [Full Millis AI vs Bland AI verdict](https://www.versusref.com/voice-ai/bland-vs-millis/)

### 46. OpenAI Realtime API

Both tools are API-first and neither supports bring-your-own LLM, so those critical pipeline-control factors cancel out. [Full OpenAI Realtime API vs Google Gemini Live API verdict](https://www.versusref.com/voice-ai/gemini-live-api-vs-openai-realtime-api/)

### 47. Voiceflow

Both tools are API-first and offer no-code builders, but Voiceflow adds capabilities specifically useful for engineering teams building custom pipelines: bring-your-own LLM support lets teams plug in their own models, a simulation and testing suite enables pipeline validation, and white-label sub-accounts support multi-tenant architectures. [Full Voiceflow vs ElevenLabs Agents verdict](https://www.versusref.com/voice-ai/elevenlabs-agents-vs-voiceflow/)

### 48. Cognigy (NiCE)

Agentic AI platform for CX (Cognigy.AI + Voice Gateway); Forrester Wave 2026 Leader, sold standalone and inside NiCE CXone Mpower. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 49. Rosie

Self-serve SMB AI answering service with bundled-minute pricing and bilingual EN/ES on every plan. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 50. Decagon

AI concierge platform - voice/chat/email agents driven by natural-language Agent Operating Procedures (AOPs). No won verdicts for this use case yet; it ranks on ties and near-misses.

### 51. Dograh

Self-hostable open-source voice agent platform ('OSS alternative to Vapi & Retell') with a no-code workflow builder and air-gapped on-prem deployment for regulated industries. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 52. Domu

YC S24 collections-automation platform for financial institutions across the Americas - 'compliance is not a checkbox, it is the architecture'. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 53. Google Gemini Live API

Native-audio speech-to-speech model API (Gemini Live) with barge-in, affective dialog, and tool use over a stateful WebSocket. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 54. Observe.AI

Contact-center AI platform expanding from conversation intelligence into autonomous VoiceAI agents (inbound and outbound) with copilots for frontline teams. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 55. Omilia

Conversational AI platform for contact-center voice/IVR automation, with native 'Lexis' voice synthesis and agentic voice/chat agents. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 56. Ringly.io

Ecommerce phone agents. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 57. Twilio ConversationRelay

Carrier-grade voice harness for BYO-LLM agents inside Twilio Programmable Voice. No won verdicts for this use case yet; it ranks on ties and near-misses.

### 58. Ultravox

Realtime speech model + platform. No won verdicts for this use case yet; it ranks on ties and near-misses.

Source: https://www.versusref.com/voice-ai/best/developer/