Ultravox Review
Realtime speech model + platform
Among the 23 voice ai tools we track, Ultravox has the 7th-cheapest per-minute rate - a fit for cost-sensitive, high-volume work.
From $0.05/min
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What we know about Ultravox
This is our verified profile of Ultravox, a voice ai platform - realtime speech model + platform. Every fact about Ultravox below carries the source it came from and the day we checked it.
On pricing, Ultravox starts at $0.05 per minute for its entry tier. That is the sticker rate: real production cost usually runs higher once you add a language model, a voice provider, and telephony minutes, and we model Ultravox closer to 0.055-0.055 USD/min all-in.
New Ultravox accounts get 30 minutes free, then $0.05/min to test with before a card is required, which is enough to run a handful of real calls and judge latency and voice quality for your own script rather than a demo.
On capabilities, Ultravox covers native sip trunking, bring-your-own tts voice, native outbound campaigns, warm transfer to human, built-in knowledge base, and dtmf / ivr navigation, and does not offer annual contract required for best pricing?, bring-your-own llm, and interruption handling (barge-in). Each of those is verified against Ultravox's own docs or dashboard, not marketing copy.
On performance, Ultravox reports 5 calls concurrent calls on the base plan. Latency figures are vendor claims until we measure them ourselves, and they are labeled that way on the Ultravox fact sheet, so treat them as a starting point rather than a guarantee.
Placed against the 23 voice ai tools we track, Ultravox's strongest showing is the 7th-cheapest per-minute rate, while it trails at 9th on base concurrency - a spread worth weighing against your own priorities.
In total we track 23 verified facts for Ultravox today, each linking the primary source it came from so you can check our work - and vendor claims we have not measured ourselves are labeled as such on the Ultravox fact sheet below.
Reviewed by vsref Editorialfacts verified Jul 15, 2026Methodology →
Ultravox pricing
≈ $0.055 per minute all-in (est.), verified Jul 15, 2026 (source).
| Monthly volume | All-in monthly bill |
|---|---|
| 1K min/moSolo builder | $55 |
| 10K min/moAgency | $550 |
| 100K min/moCall center | $5,500 |
All-in monthly: platform fee + per-minute + telephony. Assumes GPT-4o class model, ElevenLabs voice. How we compute costs →
Fact sheet
Every row independently verifiedConsidering a switch? Best Ultravox alternatives →
TTS in this stack
Ultravox lets you bring your own text-to-speech voice, so the voice engine is a separate pricing and quality decision. Compare the engines builders plug in most: ElevenLabs, Cartesia, OpenAI TTS, or the full text-to-speech comparison →
STT in this stack
A voice agent hears through its speech-to-text engine, and transcription accuracy and streaming latency are priced per audio minute. Compare the engines builders pair with Ultravox: Deepgram, AssemblyAI, GPT-4o Transcribe, or the full speech-to-text comparison →
Avatar video in this stack
A voice agent's conversational interface can get a face too: AI avatar video platforms ship the same live, interactive avatar mode as a layer on top of a voice stack. Compare the avatar platforms builders pair with Ultravox: HeyGen, Synthesia, Hedra, or the full avatar-video comparison →