Synthflow built its reputation as the easiest way to get an AI voice agent live. No code, no API keys, no Twilio configuration -- just a drag-and-drop builder with included telephony. The trade-off was always cost: it was the most expensive voice AI platform per minute of conversation. In 2026 that trade-off changed shape entirely -- the company stopped selling to small businesses at all.
Synthflow Pricing Today (August 2026)
The current synthflow.ai/pricing page publishes a single number: enterprise contracts starting at $30,000 annually -- roughly $2,500/month before any negotiation. Everything else (included minutes, seats, overage rates) is worked out with their sales team and is not public. That means:
- There is no published per-minute rate. Any $0.08–$0.13/min figure you see quoted for Synthflow describes plans that are no longer sold.
- There is no self-serve signup tier. Evaluation runs through sales, not a free trial with a credit card.
- The product itself hasn't vanished. The no-code builder, CRM integrations, white-label features, and sub-accounts still exist -- they are just packaged for enterprise and agency contracts now.
The Old Self-Serve Plans (No Longer Offered)
For the record -- and because thousands of listicles still quote these numbers as current -- here is the tier structure Synthflow sold when we originally reviewed it in early 2026. Treat everything in this section as historical:
- Starter, $29/month: 50 included minutes (~$0.58/min effective), 1 agent, 1 phone number, transcription, Zapier/webhooks.
- Pro, $99/month: 200 minutes (~$0.50/min), 3 agents, voice cloning, CRM integrations, call recording.
- Growth, $449/month: 1,000 minutes (~$0.45/min), 10 agents, A/B prompt testing, team access, white-label options.
- Agency, $899/month: 2,000 minutes (~$0.45/min), 25 agents, full white-labeling, client sub-accounts, API access.
Even then, the premium over developer-oriented platforms was 2–6x per minute -- what you were buying was zero-code deployment speed. Our own deployments on those plans averaged roughly $0.31/min all-inclusive. The A/B testing feature was genuinely valuable: we tested 4 different opening scripts for a dental office and found a 23% difference in appointment booking rate between the best and worst prompts. None of that math applies to a new buyer today, because none of those plans can be purchased.
Alternatives at Self-Serve Budgets: Vapi, Bland, Retell
At 500 minutes per month (a common small business volume), using pricing verified on each vendor's site in August 2026:
- Bland AI (Start plan): $0/month platform fee + 500 min × $0.14/min all-inclusive = ~$70/month. No token charges; LLM, TTS, STT, and telephony bundled.
- Retell AI: ~$0.115/min all-in with GPT-4.1 (voice engine $0.055 + TTS $0.015 + US telephony $0.015 + LLM $0.045) × 500 min = ~$58/month. Premium models cost more per minute.
- Vapi: $0.05/min platform fee ($25) + voice, LLM, and telephony components at cost = typically ~$75–$125/month depending on the stack you assemble.
- Synthflow: enterprise contract, from $30,000/year (~$2,500/month floor).
At 2,000 minutes per month the same platforms land around $230–$500, still an order of magnitude under Synthflow's published floor. See our Synthflow vs Vapi comparison for detailed feature analysis.
When Synthflow Still Makes Sense
- Enterprise call volume with no engineering appetite: If you are deploying voice agents across many locations or brands and want a vendor-managed, no-code platform with SLAs, a $30,000/year contract can be rational -- that budget also buys a lot of agency-built Vapi, so price the comparison.
- Agencies reselling voice AI at scale: The white-label and client sub-account features remain Synthflow's most distinctive capability, and they now live behind the enterprise contract.
- Everyone else: Start with Bland, Retell, or Vapi. The no-code gap has also narrowed -- all three are considerably easier to launch than they were when Synthflow's builder was the only friendly option.
We deploy voice agents across these platforms and the right choice depends on your volume, budget, and technical capability. Explore our voice AI services or get a free consultation.
Frequently Asked Questions
Does Synthflow have a free plan?
No -- and it no longer has a published paid self-serve plan either. With pricing moved to enterprise contracts (from $30,000/year), evaluation runs through their sales team rather than a free tier.
Can I use my own phone number with Synthflow?
Yes. You can port an existing phone number or use Synthflow's included numbers. Porting takes 1-2 weeks and there may be a one-time porting fee depending on your carrier.
Is Synthflow good for outbound calls?
Yes, Synthflow supports both inbound and outbound calling. Outbound is useful for appointment reminders, follow-ups, and outreach campaigns. Be aware of telemarketing regulations (TCPA in the US) -- AI-generated calls have specific compliance requirements.
How does Synthflow voice quality compare to Vapi?
Synthflow uses ElevenLabs voices by default, which sound excellent. Vapi lets you choose your voice provider -- you can use ElevenLabs, Deepgram, or others. If both use ElevenLabs, voice quality is identical. The difference is in latency: Vapi typically has lower response latency (300-500ms) than Synthflow (500-800ms) because of Vapi's optimized streaming pipeline.