Synthflow pricing & cost
No-code agencies and white-label resellers building SMB voice agents.
Entry price
Free start, usage-based
AI usage rate
$0.09/min voice engine; $0.15–$0.24/min all-in
Free tier
Yes — free to start, 5 concurrent calls
Billing model
per-minute
Our verdict
The agency/white-label pick — easy to build on and the most generous affiliate, but watch the per-minute add-ons.
Strengths
- No-code builder
- White-label/reseller program
- Strongest recurring affiliate (20% for 15 months)
Watch-outs
- Add-ons +$0.04/min (routing, edge)
- White-label toolkit $2,000/mo
- Enterprise minimum 10,000 min/mo
Who it's for
No-code agencies and white-label resellers building SMB voice agents. Typically a fit for small, mid teams.
Sources
Synthflow alternatives
Free ($0.14/min); Build $299/mo ($0.12/min); Scale $499/mo ($0.11/min)
The 'no surprises' option — its headline rate is roughly the real rate, which is rare; you pay a monthly fee for that predictability.
Cartesia (Line)Free; Pro $5/mo; Startup $49/mo
A strong low-latency voice layer for builders — but the $0.06/min Line figure is before LLM and STT, so model the full stack.
Deepgram (Voice Agent API)$0 PAYG ($200 free credit)
The cost-sensitive, high-volume builder's pick — best free credit in the category, but mind the websocket-time billing.
Dialpad (AI Agents)Phone from $15/user/mo; AI Agents = contact sales
Buy it for the phone system with AI baked in — the autonomous voice-agent product, though, is a contact-sales black box.