Synthflow vs Vapi
This comparison uses only what each vendor publishes. It does not rank one above the other. The right choice depends on your call volume, whether you want to pick your own models, and how much setup you can take on.
| Synthflow | Vapi | |
|---|---|---|
| Category | Enterprise voice AI | Developer voice platform |
| Pricing | Enterprise contracts start at $30,000/year; final pricing scoped by volume, concurrency and integrations. Self-serve per-minute pricing not shown on pricing page checked. | Usage-based: $0.05/min Vapi hosting fee; STT, LLM, TTS and telephony passed through at cost. Optional success packages: Core $29/mo, Pro 10% of hosting fee ($999/mo minimum). |
| Per minute | not public | $0.05/min hosting (plus pass-through model and telephony costs) |
| Free tier | not public | $5 in free credits |
| Key features | No-code voice agents; native telephony or SIP; CRM/calendar integrations (HubSpot, Salesforce, GoHighLevel, Cal.com); MSA/DPA support | API-first agent builder; bring-your-own STT/LLM/TTS; Twilio, Vonage, Telnyx, SIP and WebRTC transports; HIPAA/BAA add-on |
| Best for | Mid-market and enterprise teams wanting a managed rollout | Developers who want to mix and match model providers |
| Checked | 2026-10-16 | 2026-10-16 |
How to decide
- Estimate your real per-minute cost, including the LLM, voice, transcription and phone line, in the calculator.
- Check whether published rates include model costs or are platform fees only.
- Run the same test script on both free tiers or trials before you commit.