Overview
Synthflow is a full-stack voice AI platform that automates phone conversations at scale for tasks like support, scheduling, and lead qualification. It offers a visual flow designer, in-house low-latency telephony, and 200+ integrations with usage-based pricing.
Our take
Synthflow builds voice agents for automated phone calls, priced per minute rather than per seat, which is the right structure for this work. Voice agents have improved to the point where straightforward calls succeed. The design question that matters is what happens when the call is not straightforward, and whether the caller can reach a human quickly.
Worth it if
High-volume, well-defined call handling — appointment confirmation, qualification, routine inbound.
Look elsewhere if
Complex or emotionally sensitive calls, where a bot that will not escalate creates real damage.
✨ Features
Flow Designer
Visually build call logic and voice-agent workflows without code.
In-House Telephony
Proprietary infrastructure delivering sub-100ms latency and 99.99% uptime.
200+ Integrations
Connects to CRMs, calendars, and tools like Salesforce and HubSpot.
Omnichannel Support
Handles voice, chat, SMS, and WhatsApp interactions.
⚖️ Pros & Cons
Pros
Cons
💰 Pricing
Pay As You Go
$0
- Free to start, then usage-based (~$0.15-$0.24/min)
- 5 concurrent calls
- Unlimited agents, API & integrations
- SOC2, GDPR, ISO 27001 compliance
- Bring your own telephony or Synthflow Twilio
Enterprise
Custom
- Contact sales (min. 10,000 minutes/month)
- 99.99% uptime SLA
- Unlimited concurrent calls & custom workflows
- White-label & reseller toolkit
- Dedicated support team and solution architect
Categories
❓ Frequently Asked Questions
Do I need to disclose that the caller is talking to AI?
Increasingly yes, and several jurisdictions now require it for automated calls. Beyond the legal position, undisclosed synthetic voice is the thing people react to most negatively when they discover it. Disclosure costs one sentence at the start and removes an entire category of complaint.
What does per-minute pricing mean for my actual bill?
That cost scales with call duration and volume rather than with team size, which suits variable workloads and makes budgeting harder. Model average handle time times expected volume, and include failed and abandoned calls. A badly designed flow that keeps callers on the line longer costs money as well as goodwill.