Compare voice AI for production phone calls.
Use these pages to judge latency, telephony fit, and migration effort first - then see how the economics compare. Category pages explain the technical tradeoffs; competitor pages cover capability, migration paths, and pricing.
Speech-to-text
PyAI Hear vs Deepgram, AssemblyAI, OpenAI, Google, ElevenLabs and Whisper hosts - price, with independent accuracy linked.
CompareStreaming speech-to-text
Realtime ASR on price plus the part that matters live: turn-taking latency.
CompareText-to-speech
PyAI Speak vs ElevenLabs, Cartesia, OpenAI, and Deepgram - latency, cloning, and billing model.
CompareRealtime voice agents
PyAI Omni vs OpenAI Realtime, Vapi, Retell, Bland, and the DIY stack - all-in $/min.
CompareAnswering machine detection
PyAI AMD vs Twilio AMD - who or what answered, the new iPhone/Google screeners legacy AMD calls human, and one line of TwiML to switch.
ComparePricing, all-in
Advertised platform fee vs the real all-in $/min - Omni next to Vapi, Retell, Bland, ElevenLabs, and Synthflow.
CompareCompare the whole minute, not the sticker price.
Advertised rates rarely include everything a call needs. Whoever you pick, add up speech-to-text, the LLM, text-to-speech, telephony, and any platform fee before you compare, and test with recordings of your own calls, not the vendor's demo audio.
Every comparison on these pages shows all-in numbers on that basis, ours and theirs, with sources linked. Where a competitor figure is a vendor self-claim or promotional rate, the page says so. If you find a number that is wrong or stale, tell us and we will fix it.
Competitor pages
PyAI vs Bland AI
Run production phone agents at human conversational pace - ~390 ms median voice-to-voice, in-region - with an OpenAI-compatible migration path you can ship in an afternoon. And the price is the price: $0.05/min all-in (speech + brain + telephony), per second, no platform fee to clear first. Bland advertises from ~$0.09/min, but paid tiers stack platform fees on top, so the all-in lands ~$0.11-$0.14/min. Bland has stronger enterprise proof today; this is the honest builder's path.
ComparePyAI vs Vapi
Run the whole voice agent - STT, reasoning, retrieval, and TTS - on one speech-to-speech model and one socket, with telephony-grade turn-taking instead of cross-vendor hops. Vapi advertises a ~$0.05/min platform fee, but that's only the orchestration layer: add STT, an LLM, TTS, and telephony and the all-in lands ~$0.10-$0.31/min, each billed separately. PyAI is $0.05/min all-in - one key, one bill, no asterisk. Vapi still shines when provider choice is the point.
ComparePyAI vs Retell AI
Ship a production voice agent on one engine with fewer moving parts to tune and babysit - telephony-grade turn-taking out of the box at human conversational pace, then one flat all-in rate so the economics are predictable too. Retell advertises around $0.07/min for the platform, but the all-in - voice infra + TTS + LLM + telephony + add-ons - typically lands ~$0.13-$0.31/min. PyAI is one flat $0.05/min all-in. Retell is great if you want to hand-tune every component; this is for teams who want it to just work and move on.
ComparePyAI vs xAI Voice Agent Builder
Same $0.05/min headline, different job. xAI's Voice Agent Builder is a fast, no-code way to spin up a Grok voice agent; PyAI Omni is built for production phone lines, with the telephony depth, all-in economics, and audit that businesses run on.
ComparePyAI vs ElevenLabs
Produce emotional, directable long-form audio for podcasts, narration, and audiobooks - with commercial rights and Voice Designer included, billed simply by the minute, no credit math. For realtime, Speak streams its first audio byte in ~53 ms warm (in-region) - the same sub-100ms class as ElevenLabs Flash - and a cloned voice in ~32 ms. ElevenLabs owns the creator brand and the naturalness leaderboard; Cast wins on direction and clean long-form economics ($1.20/hr), and Speak wins on predictable per-minute billing.
ComparePyAI vs Deepgram
Transcribe telephony-native 8 kHz call audio with a ~185 ms first partial (in-region, revisable) - the same fast class as Deepgram's published 150-300 ms interim band - then grow into a full phone-agent stack on the same account, with $50 in free credit to start. Drop in via the OpenAI-compatible endpoint and change one line. Deepgram has deep STT credibility and broader language coverage; PyAI gives you a clean, OpenAI-compatible runway from transcription to live agents.
ComparePyAI vs Cartesia
Run phone agents and emotional long-form narration under one bill instead of buying TTS alone. Cartesia is a strong call when raw time-to-first-audio is the only metric; PyAI wins on full-stack agent and Cast economics.
ComparePyAI vs Aircall AI Voice Agent
Pay for AI minutes and outcomes - $0.08/min Agents, $0.01/min managed telephony - instead of per-seat licenses and AI add-ons stacked on a phone plan. Aircall is convenient if you're already standardized on it; PyAI is purpose-built voice AI.
ComparePyAI vs CloudTalk
Buy AI agents as the product - usage-based, developer-first, bring your own number or use managed telephony - not as a feature bundled inside a phone seat. CloudTalk is broader contact-center software; PyAI focuses on the voice AI itself.
ComparePyAI vs Synthflow
Launch no-code with the Agents feature and keep full API control with Omni as you scale - one stack, lower published minute rates. Synthflow can be simpler for nontechnical agency workflows; PyAI grows with you from no-code to API.
ComparePyAI vs AssemblyAI Voice Agent API
Get a bundled realtime agent with grounded turn-taking built in and an OpenAI-compatible alias to drop in - and flat all-in economics at $0.05/min, below the ~$0.075/min bundled rate. AssemblyAI has strong speech credibility; PyAI ships the all-in agent with predictable pricing.
ComparePyAI vs OpenAI Realtime API
Keep the OpenAI-compatible mental model but move to telephony-native turn-taking tuned for 8 kHz phone audio - then get flat, predictable $0.05/min phone-agent billing instead of variable token math. OpenAI is the broad model platform; PyAI is intentionally narrow and tuned for production voice calls.
ComparePyAI vs Twilio Voice AI
Keep Twilio or SIP for the phone rails and drop in one AI voice engine instead of stitching STT, LLM, TTS, turn-taking, and compliance yourself. Twilio stays a powerful carrier; PyAI is the agent that talks on it.
CompareChoose how you want to start.
Use an instant sandbox key for the API, or open Agents Beta and build without code. Sandbox usage never bills. Live keys require available credit.
Agents is live in beta. Sandbox keys have daily limits and never touch billing.