Synthflow AI lets you build and deploy voice AI agents with no code — drag-and-drop conversation flows, 20+ languages, and per-minute pricing from $29/mo.
Synthflow AI is a no-code platform for building voice AI agents that handle phone calls — inbound enquiries, lead qualification, appointment booking, after-hours support and outbound campaigns. We picked it because among the wave of "Vapi-but-easier" platforms, Synthflow has done a clean job on the agency-and-SMB use case: a visual flow builder, native support for Twilio numbers and dozens of CRM integrations, and a workspace model that lets agencies manage voice agents for many clients. The trade-off is that voice AI is genuinely expensive to run, and the per-minute meter quickly dwarfs the monthly platform fee on any number that takes real call volume.
You design an agent — a system prompt, a knowledge base, a flow with branching logic, tool calls (calendar booking, CRM update, knowledge lookup) and webhook triggers. You attach a phone number from Twilio (BYO) or buy through Synthflow, set up call routing and go live. The agent handles natural conversation, books on Google Calendar or Calendly, fetches data from HubSpot, Salesforce, GoHighLevel or Zoho, and posts call summaries to Slack or your CRM after each call.
Voice quality uses ElevenLabs, OpenAI, PlayHT and other providers under the hood; you choose per agent. STT, intent classification and tool routing are bundled. There is also an outbound campaigns module for dialler-style use cases, and an Agency workspace model for managing multiple sub-accounts.
Synthflow AI publishes Starter ($29/month, ~50 minutes of voice agent calls), Pro ($450/month for 2,000 minutes), Growth ($900 for 4,000 minutes), and Agency / Enterprise tiers (quoted, with sub-accounts and white-label). Overage is billed per minute and varies by voice provider. Outbound campaigns and white-label features sit on the higher tiers.
The honest cost watch: a phone number that takes 200 calls a month at 4 minutes each is 800 minutes — past Starter, into Pro territory. Agencies with multiple client numbers should price the higher tiers carefully and watch for telephony pass-through costs (Twilio per-minute) on top of Synthflow's platform fee.
| Tool | Strength | Starter price | Best for |
|---|---|---|---|
| Synthflow AI | No-code flow builder, agency model | From $29/mo | SMBs and agencies |
| Vapi | Developer-first voice API | Pay-as-you-go | Engineering-led builds |
| Retell AI | Low-latency voice agents | Pay-as-you-go | Latency-critical workflows |
| Bland AI | Outbound dialler agents | Pay-as-you-go | High-volume outbound |
Verified deal
Build one inbound flow on day one — say, a missed-call recovery agent for a service business. That single agent answers the question "is this worth the money?" within a week.
See the Synthflow AI offerSynthflow AI lets founders deploy a voice agent that screens inbound calls, qualifies leads, and books demos—without hiring a BDR or learning Twilio. The agent routes qualified prospects to Calendly and logs details to Salesforce. Founders iterate on the call script weekly based on transcript analysis.
RevOps teams use Synthflow AI to answer common support questions, triage tickets by urgency, and transfer complex issues to humans. Synthflow integrates with Zendesk or Intercom to auto-log interactions. Call volume drops 30–40%, freeing support staff for high-touch problems.
Agencies build Synthflow AI agents for clients running seasonal campaigns, event registrations, or appointment reminders. Synthflow's webhook and Zapier integrations let agencies resell voice automation without building infrastructure. Clients get a branded phone number and agent; agencies keep margins.
Quarterly access to product leadership.
Bonus credits redeemable on partner tooling.
We re-verify the offer every quarter so it never goes stale.
Hit the button on this page — opens the partner site in a new tab.
Check your investor or accelerator benefits portal for the Synthflow AI partner code. Y Combinator, Sequoia, and most Tier 1 VCs have codes available.
Renewals stay at the same rate — verified by us, not the vendor.
| Feature | Synthflow AI |
|---|---|
| Free trial | 14 days |
| Cheapest paid plan | $0/mo |
| Annual discount | Up to 25% |
| Refund window | 30 days |
| Setup time | < 1 hour |
| Best for | Founders |
“White-label on Scale plan is great for agency resellers”
“Transparent pricing is what Air.ai and others should copy”
“Built a lead qualification agent in one afternoon”
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Free trial available
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Free plan + free trial available
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