Synthflow
End-to-end voice AI platform for enterprise call automation — $20M Series A (Accel), 1000+ customers, 45M calls handled, 99.9% uptime.
Overview
Synthflow: Enterprise Voice AI for Call Automation
Synthflow is the end-to-end voice AI platform for enterprise-scale phone call automation. Designed for non-technical business users to deploy custom, low-latency AI agents without requiring specialized teams or long onboarding, the platform handles 10M+ voice calls monthly across 30+ countries with 99.9% uptime.
$20M Series A in 2025 led by Accel (with Atlantic Labs and Singular). $30M total raised. 1,000+ customers, 45M+ calls handled to date, particularly strong adoption in BPOs and contact centers seeking scalable automation.
Key Features
- No-code drag-and-drop voice agent builder
- Salesforce CRM and contact-center stack integrations
- Sub-second latency for natural conversation flow
- 99.9% uptime, 10M+ monthly calls in production
- Sales + support agents from one platform
Ideal Use Case
BPOs, contact centers, and enterprise sales/support teams scaling phone-based customer interactions. Particularly strong for organizations where AI handles inbound + outbound at volumes humans can't economically reach.
Why Use Synthflow
Vapi/Retell/Bland target developers building voice agents. PolyAI targets very-large enterprise. Synthflow's wedge: no-code accessibility for mid-market BPOs/contact centers, plus the production-scale numbers (10M monthly calls) that prove it works.
FAQ
What does Synthflow do? Synthflow is an end-to-end voice AI platform that automates enterprise phone calls without requiring code. It handles incoming and outgoing call workflows, customer support interactions, and other voice-based business processes at scale.
Who should use Synthflow? Synthflow is built for enterprises and businesses that need to automate high volumes of phone calls and customer interactions. It's designed for teams looking to reduce manual call handling while maintaining reliability and quality.
How much does Synthflow cost? Synthflow operates on a freemium model with free and paid tiers available. Visit the Synthflow pricing page for current plans and to explore what works best for your use case.
How does Synthflow compare to similar tools? Synthflow competes with other voice AI platforms like PolyAI, Bland AI, and Vapi. It distinguishes itself through enterprise-grade reliability, having handled 45 million calls with 99.9% uptime and serving over 1,000 customers.
tl;dr
Enterprise voice AI for call automation. $20M Series A, 1000+ customers, 45M calls handled. The mid-market voice agent leader.
Related
Looking for more options? Browse the Voice AI directory or read our best AI voice tools listicle. Synthflow is also tracked on Crunchbase.
Why Use Synthflow
Editorial Review
Our take on Synthflow.
Synthflow is a voice AI platform for automating enterprise calls without coding, handling 45M calls across 1000+ customers with 99.9% uptime.
What works
- No-code voice automation; 45M call track record reduces technical risk
- Freemium entry point; pilot without commitment
- 99.9% uptime SLA for production call handling
What doesn't
- Vendor lock-in on voice quality and call infrastructure
- 335 community likes; less battle-tested than category leaders
Synthflow handles end-to-end call automation via no-code voice AI, positioning itself against competitors like PolyAI and Bland AI. The platform serves 1000+ enterprise customers and has processed 45 million calls, backed by Accel's Series A investment. That scale and uptime claim (99.9%) suggest production maturity for customer support and inbound/outbound call workflows where you'd otherwise hire contact center staff or build custom IVR logic.
The no-code angle matters: if your team isn't staffed for speech-to-text, voice synthesis, and call flow orchestration in-house, Synthflow abstracts those layers. Freemium pricing removes friction for pilots. The main trade-off is vendor lock-in on voice quality, latency, and call routing—you're trusting Synthflow's infrastructure for uptime-critical customer interactions. Community rating of 4.82 is solid, though the 335 likes suggest it hasn't yet crossed into tier-one awareness relative to larger platforms.
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