Vapi review: the AI phone agent platform for developers who want every knob
Answer in brief: Vapi is the best AI phone agent platform for engineering teams that want full control. You pick the transcriber, LLM, voice and carrier, and Vapi passes provider costs through with no markup on top of a $0.05/minute hosting fee. Vapi's own estimate for 1,000 minutes is about $82–$129/month. The catch: you manage several cost lines, and HIPAA is a $2,000/month add-on.
Top pick for developer control. You get unlimited agents, simulations, monitoring, config-as-code and multi-agent Squads, all wired into the carrier you choose.
Independent research from Vapi's pricing page and docs, read November 9, 2026. We did not test Vapi hands-on. Latency figures are Vapi's claims.
Inbound, outbound and in-app voice
Vapi is a developer platform for voice agents. They can answer phone lines, place outbound calls or run inside your app over WebSockets or WebRTC. Squads let several specialized agents hand a call between them. Built-in testing, call simulation, monitoring, a CLI and config-as-code fit normal engineering workflows.
Latency and voice: tune it yourself
Vapi's docs claim sub-600ms responses and natural turn-taking. Because you choose every component, you set the trade-off between speed, quality and cost. Supported providers include Deepgram and Gladia for transcription, OpenAI, Anthropic and Google for models, and ElevenLabs for voice. Example ranges from Vapi's pricing page: Deepgram $0.0095–$0.0099/min, OpenAI $0.0077–$0.0452/min, ElevenLabs $0.0146–$0.0238/min. Comparing model hosts for speed? See Best inference providers.
Telephony: bring any carrier
Vapi telephony/SIP, WebSockets and Daily WebRTC transport are free. Third-party carriers are priced per minute: Twilio inbound $0.008 and outbound $0.014, Vonage $0.00814, Telnyx $0.0055. Premier adds a dedicated SIP setup.
Who Vapi fits
- Engineering teams building voice AI into their own products.
- Teams that want to swap models and voices as better ones arrive.
- Builders comfortable managing several invoices and provider accounts.
Strengths
- No markup on model and voice costs.
- Unlimited agents on every plan.
- Free native SIP and WebRTC transport.
- A deep developer toolkit: simulations, monitoring, Squads, CLI.
Honest drawbacks
- Several separate cost lines make the total harder to forecast.
- The free tier gives only 4 concurrent calls, 14-day retention and Discord support.
- HIPAA is $2,000/month. Pro is 10% of hosting with a $999/month minimum.
- Extra concurrency is $10 per line per month.
Pricing
| Plan | Price | Numbers | Concurrent calls |
|---|---|---|---|
| Free | $5 credits | 1 | 4 |
| Core | $29/mo | 5 | 10 |
| Pro | 10% of hosting, $999/mo minimum, 99% uptime SLA | 10 | 30 |
| Premier | Custom, 99.9% SLA | Custom | Custom |
All usage carries the $0.05/min hosting fee plus provider costs.
Best alternatives
- Retell AI: a similar build-it-yourself platform with one itemized price list and 20 concurrent calls included.
- Bland AI: one bundled per-minute rate covering the LLM, transcription and voice.
- PolyAI: an audio-native model API at 2¢ a minute for teams with their own voice stack.
Vapi FAQ
How much does Vapi cost?
A $0.05/min hosting fee plus provider costs at no markup. Vapi estimates $82–$129/month for 1,000 minutes.
Does Vapi support Twilio?
Yes. Twilio, Vonage and Telnyx are supported, and Vapi's own telephony/SIP is free.
Is Vapi HIPAA compliant?
HIPAA is available as a $2,000/month add-on.
Sources
- Vapi pricing
- Vapi docs: introduction
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