Millis AI Review
Low-latency voice agents
Among the 31 voice ai tools we track, Millis AI has the 1st-widest language coverage and the 6th-cheapest per-minute rate - a fit for multilingual and localization projects and cost-sensitive, high-volume work.
From $0.02/min
If you sign up through links on this page, vsref may earn a commission; programs exist on both sides of most comparisons, and commissions never change verdicts. How we make money
What we know about Millis AI
Millis AI sits in the voice ai category, where it is low-latency voice agents. We keep this Millis AI profile grounded in primary sources, each fact dated to when we last confirmed it.
On pricing, Millis AI starts at $0.02 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 Millis AI closer to 0.06-0.66 USD all-in.
On capabilities, Millis AI covers native sip trunking, bring-your-own llm, bring-your-own tts voice, native outbound campaigns, buy/port numbers in-platform, and interruption handling (barge-in). Each of those is verified against Millis AI's own docs or dashboard, not marketing copy.
On performance, Millis AI reports a median end-to-end latency around 600 ms. Latency figures are vendor claims until we measure them ourselves, and they are labeled that way on the Millis AI fact sheet, so treat them as a starting point rather than a guarantee.
Placed against the 31 voice ai tools we track, Millis AI's strongest showing is the 1st-widest language coverage, while it trails at 12th on latency - a spread worth weighing against your own priorities.
In total we track 18 verified facts for Millis AI 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 Millis AI fact sheet below.
Reviewed by vsref Editorialfacts verified Jul 15, 2026Methodology →
Millis AI pricing
≈ $0.36 per minute all-in (est.), verified Jul 15, 2026 (source).
| Monthly volume | All-in monthly bill |
|---|---|
| 1K min/moSolo builder | $360 |
| 10K min/moAgency | $3,600 |
| 100K min/moCall center | $36,000 |
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 Millis AI alternatives →
TTS in this stack
Millis AI 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 Millis AI: 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 Millis AI: HeyGen, Synthesia, Hedra, or the full avatar-video comparison →