Side-by-side comparison to help you choose the right tool for your business
Our Verdict: Synthflow for fast no-code deployment, Vapi for developer-controlled customization
Synthflow lets non-technical teams deploy AI phone agents in under an hour with its visual builder and pre-built templates. Vapi gives developers complete control over conversation logic, voice selection, and LLM orchestration via API. If your business needs a receptionist or appointment setter today, Synthflow ships faster. If you're building voice AI into a product or need complex multi-agent routing, Vapi's flexibility is essential.
Small businesses and agencies that need voice AI without developers
$29/mo (Starter, 50 min) / $99/mo (Pro, 250 min) / $449/mo (Growth, 1,000 min) / Custom (Agency)
beginner
1-3 days
Developers building custom voice AI products and complex call flows
$0.05/min (platform) + voice provider + LLM costs (typically $0.10-0.18/min total)
advanced
5-14 days
| Feature | Synthflow | Vapi |
|---|---|---|
| No-code builder | Yes (visual flow builder) | No (API-first) |
| Voice provider options | Built-in only | 10+ providers (choose per agent) |
| LLM flexibility | Pre-configured options | Any LLM with API access |
| Call transfer | Yes | Yes (warm + cold transfer) |
| CRM integration | Native (HubSpot, GHL, Salesforce) | Via webhooks/API |
| White-label | Yes (agency plans) | Yes (custom branding) |
| Real-time monitoring | Dashboard only | Server-side events + webhooks |
| Multi-agent routing | Basic | Full programmable routing |
Pre-built dental receptionist template handles appointment scheduling, insurance questions, and call routing. Office manager deploys it in 45 minutes.
API-first design integrates cleanly into existing product architecture. Server-side events feed conversation data into the product's analytics pipeline.
White-label agency plan lets the agency manage all clients from one dashboard. No developer needed to spin up new agents per client.
Programmable routing handles claim type detection, agent escalation, and fraud flag logic that Synthflow's visual builder can't express.
We implement both options. Tell us your use case and we'll recommend the right fit — then set it up for you.
Synthflow: $0.08-0.13/min all-in (depends on plan tier). Vapi: $0.05/min platform + $0.03-0.08/min voice (ElevenLabs) + $0.01-0.03/min LLM = $0.09-0.16/min total. Synthflow is simpler to predict; Vapi is cheaper at high volume if you optimize component choices.
Yes, but expect significant rebuild effort. Conversation logic, phone numbers, and CRM integrations all need to be recreated. The prompts and business rules transfer conceptually but not as code. Plan for 2-3 weeks of migration for a complex agent.
Vapi, because you choose the voice provider and LLM independently and can optimize for speed. Vapi with Deepgram STT + GPT-4o-mini + PlayHT voice achieves sub-1-second latency. Synthflow's latency is typically 1-2 seconds and less tunable.
Not for basic agents. The visual builder handles receptionist, appointment setter, and lead qualifier use cases without code. For custom integrations, webhooks, or complex conditional logic, you'll want a developer — at which point Vapi might be a better investment.