Synthflow vs Vapi: voice AI agent pricing compared
Updated 2026-11-10 · listed A to Z, not ranked
Synthflow is a voice AI agent platform for phone calls. It no longer lists self-serve plans: its pricing page describes an annual agreement sized to your call volume and setup.
Vapi is a platform for building voice AI agents. A call’s cost is Vapi’s own hosting fee plus the providers you pick for transcription, the language model and the voice, which Vapi passes through at cost, plus telephony if you use an outside carrier.
Listed A to Z, from synthflow.ai and vapi.ai. Every figure below is quoted from those pages.
- Main price table
- Contract, Free plan or trial, Per-minute rate, What the agreement covers
- Free option
- Free plan or trial: None
- Published prices
- An annual enterprise agreement scoped to call volume, telephony and integrations. No free plan or per-minute rate.
- Main price table
- Vapi hosting, Transcriber, model, voice, Vapi telephony / SIP, WebSockets, Daily WebRTC, Twilio inbound / outbound (charged by the carrier), Vonage / Telnyx (charged by the carrier)
- Free option
- Vapi telephony / SIP, WebSockets, Daily WebRTC: Free
- Published prices
- $0.05 per minute Vapi hosting, provider costs passed through at cost, Core $29 and Pro $999 packages, concurrency and add-ons.
How we checked: Prices quoted from each official pricing page: Synthflow checked Nov 10, 2026, Vapi checked Nov 10, 2026. Taxes, usage overages and promotions can change what you pay; confirm with each provider before you buy.
How they compare
- Main price table. Synthflow lists 4 entries (Contract, Free plan or trial, Per-minute rate, What the agreement covers); Vapi lists 5 (Vapi hosting, Transcriber, model, voice, Vapi telephony / SIP, WebSockets, Daily WebRTC, Twilio inbound / outbound (charged by the carrier), Vonage / Telnyx (charged by the carrier)).
- Free option. Synthflow: Free plan or trial: None. Vapi: Vapi telephony / SIP, WebSockets, Daily WebRTC: Free.
- How prices are quoted. Synthflow: “How Synthflow is priced”. Vapi: “What a minute is made of”.
Synthflow plans and prices
| Item | What the pricing page says |
|---|---|
| Contract | Annual enterprise agreement, scoped to call volume, phone system, integrations, security needs and launch support |
| Free plan or trial | None |
| Per-minute rate | None published |
| What the agreement covers | Call volume and concurrency, telephony (native or SIP), integrations, security and procurement review, support terms and launch support |
From synthflow.ai, checked Nov 10, 2026. Full breakdown: Synthflow pricing.
Vapi plans and prices
| Line | Price on vapi.ai/pricing |
|---|---|
| Vapi hosting | $0.05 per minute (prepaid) |
| Transcriber, model, voice | Passed through at the provider’s cost, no markup |
| Vapi telephony / SIP, WebSockets, Daily WebRTC | Free |
| Twilio inbound / outbound (charged by the carrier) | $0.008 / $0.014 per minute |
| Vonage / Telnyx (charged by the carrier) | $0.00814 / $0.0055 per minute |
New accounts get $5 in free credits. Vapi’s calculator shows ranges for one example setup: Deepgram transcriber $0.0095–$0.0099, OpenAI model $0.0077–$0.0452 and ElevenLabs voice $0.0146–$0.0238 per minute; its 1,000-minute example totals $82–$129 a month (Nov 3, 2026).
| Package | Price | Concurrent calls | Included |
|---|---|---|---|
| Usage only | Pay per minute | 4 | 2 organizations, 1 Vapi phone number, 14 days data retention |
| Core | $29 / month | 10 | 5 Vapi numbers, 30 days retention, ZDR, 2 business day email SLA |
| Pro | 10% of the Vapi hosting fee, $999 / month minimum | 30 | 10 numbers, 180 days retention, Slack support, 99% uptime SLA |
| Premier | Contact sales | Custom | 99.9% uptime SLA, SSO, dedicated SIP available |
Add-ons seen Nov 1, 2026: extra concurrent lines $10 per line per month, extra organizations $20 each per month, HIPAA $2,000 per month.
From vapi.ai, checked Nov 10, 2026. Full breakdown: Vapi pricing.
FAQ
How much does Synthflow cost?
An annual enterprise agreement scoped to call volume, telephony and integrations. No free plan or per-minute rate. (checked Nov 10, 2026).
How much does Vapi cost?
$0.05 per minute Vapi hosting, provider costs passed through at cost, Core $29 and Pro $999 packages, concurrency and add-ons. (checked Nov 10, 2026).
Do Synthflow and Vapi have a free option?
Synthflow: Free plan or trial: None. Vapi: Vapi telephony / SIP, WebSockets, Daily WebRTC: Free.
Which is better, Synthflow or Vapi?
We do not pick a winner. The two price and package their products differently; the tables above quote each official pricing page so you can match a plan to your own usage.
Where do these prices come from?
Each vendor's own pricing page: synthflow.ai (checked Nov 10, 2026) and vapi.ai (checked Nov 10, 2026). Prices change; confirm on the vendor's page before you buy.
Sources (official pages, read 2026-11-10)
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