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Synthflow vs Vapi
What each vendor publishes about price, minutes, compliance and integrations, side by side. Checked Oct 26, 2026. We have not tested either product; every fact links back to its source on the vendor page.
The differences in short
- Vapi publishes a monthly price (Free); Synthflow does not.
- They name no industry in common (neither names a specific industry).
- Shared integrations: API.
- Vapi states hipaa; Synthflow does not say so on the pages we checked.
- Synthflow states appointment booking; Vapi does not say so on the pages we checked.
- Synthflow states crm integration; Vapi does not say so on the pages we checked.
- BAA: Vapi say they sign one.
Side by side
| Fact | Synthflow | Vapi |
|---|---|---|
| Type | Voice agent platform | Voice agent platform |
| Starts at | Quote | Free |
| Billing model | Enterprise contract | Pay as you go |
| Per-minute rate | Not published | $0.05 |
| Price per call | Not published | Not published |
| Included on entry plan | Not published | Not published |
| Overage | Not published | Not published |
| Free plan / trial | Not stated | $5 free credits |
| HIPAA | Not stated | BAA available |
| Languages | Not published | Not published |
| Human backup | Transfers to your team | Not stated |
| Spanish / bilingual | Not stated | Not stated |
| After-hours / 24/7 | Not stated | Not stated |
| Appointment booking | Yes (vendor states it) | Not stated |
| CRM integration | Yes (vendor states it) | Not stated |
| Build style | No-code / low-code | Developer / API |
| Telephony included | Yes | Yes |
| Bring your own carrier / SIP | Yes | Yes |
| Choice of LLM | Not published | Yes |
| Choice of voice provider | Not published | Yes |
| Latency (vendor claim) | Sub-100 ms telephony latency | Sub-500ms |
| Concurrency | Custom concurrency planning (enterprise) | 4, 10 or 30 concurrent calls by package; add-ons available |
| Outbound calling | Yes | Yes |
| White label | Yes | Not published |
| Contact-center integrations | Cisco, Avaya, Genesys, RingCentral, Salesforce, HubSpot | Not published |
| Integrations | Cal.com, CRM, Contact-center stack, Webhooks, API, WhatsApp | Twilio, Vonage, Telnyx, SIP, API |
| Industries named | General small business | General small business |
| Contract | Not published | Not published |
| Checked | Oct 26, 2026 | Oct 26, 2026 |
| Website | Visit | Visit |
Summaries
Synthflow: Enterprise voice AI platform for building phone agents with native telephony, SIP and contact-center integrations.
Vapi: Developer platform for voice agents: $0.05/min hosting plus pass-through transcriber, model, voice and telephony.
Keep comparing
Sources: Synthflow listing and Vapi listing, each with the vendor URLs we read. Spotted an error? Send a correction.