Synthflow review
★ 4.3/5AI voice platform
Enterprise-ready, no-code AI voice agent platform for automating inbound and outbound phone conversations at scale. Positions as an end-to-end Voice AI platform with in-house telephony, a visual flow designer, and 200+ integrations across CRM, calendar, and helpdesk tools.
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Best for No-code voice phone agents. Synthflow starts $0.00/mo base (Pay As You Go); pay per min on a per-minute usage, no flat fee model. No monthly subscription on the entry plan, you pay per minute and the price is the SUM of stacked components, not a single rate. A typical minute runs voice engine $0.09 plus an LLM ($0.02 to $0.05) plus telephony ($0.00 with BYO Twilio to $0.02 on Synthflow-managed Twilio), landing roughly $0.15 to $0.24/min all-in, plus $1.50/mo per phone number. Concurrency beyond the included 5 calls costs $20/unit/month, so a small operation running a few thousand minutes can land in the low hundreds per month before any add-ons.
Spec
The gotcha
The advertised per-minute rate ($0.09 voice engine) is NOT your real cost, because LLM and telephony minutes stack on top, so budget $0.15 to $0.24/min all-in. Optional add-ons like Performance Routing and Global Low Latency Edge each add $0.04/min, quietly pushing the rate higher. White-label is a $2,000/month standalone add-on (only included inside Enterprise), and in-house native telephony is Enterprise-only.
Decode the real cost →Best for
- You want to build and deploy AI phone agents that handle real inbound and outbound calls, booking appointments, qualifying leads, and answering support questions, without writing code, ideally with white-label rebilling for agency clients.
source: synthflow.ai/pricing →
Synthflow pricing tiers
Prices move. Cells flagged verify link to the live vendor page.
| tier | monthly | annual | included | unit |
|---|---|---|---|---|
| Pay As You Go | $0 base + usageverify | n/a | Unlimited agents and API integrations, 5 concurrent calls (expandable at $20/call/mo), text channels (API, Widget, SMS, WhatsApp), ticket support, no guaranteed SLA | per minute (usage-based) |
| Enterprise | Custom (contact sales)verify | n/a | Built for 10,000+ minutes/month. Unlimited concurrent calls, 99.99% SLA, dedicated Slack support with a Solution Architect, white-label and reseller toolkit included | custom negotiated |
// pools and per-unit rates are volatile · cells flagged verify link to the live vendor page
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Questions
How much does Synthflow cost?
Synthflow starts $0.00/mo base (Pay As You Go); pay per min. No monthly subscription on the entry plan, you pay per minute and the price is the SUM of stacked components, not a single rate. A typical minute runs voice engine $0.09 plus an LLM ($0.02 to $0.05) plus telephony ($0.00 with BYO Twilio to $0.02 on Synthflow-managed Twilio), landing roughly $0.15 to $0.24/min all-in, plus $1.50/mo per phone number. Concurrency beyond the included 5 calls costs $20/unit/month, so a small operation running a few thousand minutes can land in the low hundreds per month before any add-ons.
Can you self-host Synthflow?
No, Synthflow is cloud-only.
Does Synthflow support MCP?
Synthflow supports MCP as Server, so it works with assistants like Claude and ChatGPT.
What's the catch with Synthflow's pricing?
The advertised per-minute rate ($0.09 voice engine) is NOT your real cost, because LLM and telephony minutes stack on top, so budget $0.15 to $0.24/min all-in. Optional add-ons like Performance Routing and Global Low Latency Edge each add $0.04/min, quietly pushing the rate higher. White-label is a $2,000/month standalone add-on (only included inside Enterprise), and in-house native telephony is Enterprise-only.