Synthflow

Synthflow is an end-to-end Voice AI platform built for enterprise phone call automation, combining in-house telephony, a visual no-code Flow Designer, and a structured deployment framework to help businesses deploy AI voice agents at scale. Rather than relying on third-party carriers, Synthflow runs its own communications infrastructure, giving it direct control over routing, latency, and regional delivery, with sub-100ms latency and 99.99% uptime even through traffic surges. The platform's BELL Framework (Build, Evaluate, Launch, Learn) connects every stage of the agent lifecycle, letting teams design flows visually, automatically test them against KPIs in a Test Center, deploy through Synthflow's own network, and continuously improve based on real-time Auto-QA and monitoring.

Synthflow agents can handle a wide range of inbound and outbound calls, including customer support, appointment booking, lead qualification, claims processing, and after-hours call routing, with built-in sentiment analysis and human handoff when needed. The platform connects to over 200 tools including Salesforce, HubSpot, Zapier, Cal.com, and major CCaaS platforms like Cisco, Avaya, and Genesys, allowing agents to update records and trigger downstream processes during live calls. Synthflow's infrastructure is certified across SOC 2, HIPAA, PCI DSS, GDPR, and ISO 27001, with region-based hosting in both the US and EU.

Founded in 2023 by Hakob Astabatsyan, Albert Astabatsyan, and Sassun Mirzakhan-Saky in Berlin, Germany, Synthflow set out to democratize access to advanced voice AI with a no-code approach similar to what Bubble did for web apps. The company has raised roughly $30 million across seed, Series A ($20M led by Accel in 2025), and other rounds from investors including Atlantic Labs and Singular. Synthflow now powers more than 65 million voice calls monthly across 30+ countries, with named customers including Freshworks, Medbelle, Smartcat, and Hostinger, and holds a 4.5-star rating across more than 1,000 G2 reviews.

Synthflow offers a free build tier where users can design custom call flows, set up voicemail detection, and configure integrations at no upfront cost using industry templates or a from-scratch builder. Once ready to launch, usage switches to a Pay-As-You-Go model based on actual calls and chats conducted. Enterprise contracts start at $30,000 annually, with final pricing scoped around call volume, concurrency, telephony setup (Synthflow Native Telephony, SIP trunking, or approved enterprise telephony), integrations, security review (MSA/DPA support, workspace controls), and launch support including implementation, onboarding, and ongoing optimization.