Synthflow AI, a Berlin-based startup building enterprise-grade voice agents, has raised $20 million in Series A funding. Accel led the round, with follow-on participation from Atlantic Labs and Singular. The investment brings Synthflow’s total funding to $30 million since launching in 2023. The funds will go toward expanding the team, opening a U.S. office, and deepening its voice AI capabilities.
Co-founder and CEO Hakob Astabatsyan said businesses are now more open to AI-led communication, and Synthflow’s aim is to make that shift easier. The startup has already processed over 45 million calls for more than 1,000 enterprise customers. Its voice agents automate tasks like scheduling, lead qualification, and customer support, all without code.
A No-Code Voice Platform for Real Conversations
Synthflow AI’s platform helps companies automate phone calls using voice agents that sound natural and respond in real time. It was built to remove technical hurdles, letting non-developers launch custom voice assistants through a no-code dashboard. Enterprises use Synthflow for a wide range of tasks. These include answering customer questions, booking appointments, transferring calls, and sharing real-time information.
The voice agents are fully white-labeled, so businesses can customize the experience. The founders, Hakob, Albert Astabatsyan (CPO), and Sassun Mirzakhan-Saky (CTO), began exploring voice bots in 2023 after experimenting with ChatGPT’s API. They discovered that building a human-like voice AI with fast response times and interruption handling was far harder than expected.
“We fell in love with this problem,” Hakob said. “From that point on, we decided to focus only on voice.” Synthflow voice agents are HIPAA and GDPR compliant and integrate with over 200 platforms like Salesforce, Twilio, and HubSpot. Accel partner Luca Bocchio called the technology “timely,” noting that voice AI is finally reaching affordability and reliability levels that make large-scale deployment practical.
Rising Demand, Measurable Growth, and Global Plans
Synthflow’s monthly call volume grew from just one million to five million within a year. The company reports a 90% enterprise customer retention rate, a sign that users see lasting value. Accel’s Bocchio said the team stood out early with its focus on enterprise-grade tech and deep CRM integrations. That focus helped Synthflow grow quickly despite competition from larger rivals like Sierra and Bland AI. The voice AI market is booming, projected to hit nearly $50 billion globally by 2031. But with that growth comes pressure.
Startups need to balance innovation with data privacy, latency, and the need for seamless user experiences. Hakob said the new funds will support U.S. expansion and faster platform development. The exact location for their U.S. office is still undecided. “We’re in a post-product-market-fit stage,” he said. “Now we know who our customers are and where we want to go.”
Synthflow Pushes Voice AI from Novelty to Necessity
As AI voice agents move from being experimental tools to essential services, Synthflow is well-positioned to shape that shift. Its platform’s simplicity and reliability make it appealing to both tech-savvy and non-technical teams. The company plans to continue improving latency and real-time capabilities, key challenges in voice AI.
It’s also betting on expansion across industries, from contact centers to healthcare and education. Accel’s Bocchio believes voice agents are finally ready to deliver real ROI. “The infrastructure is here,” he said. “Synthflow’s timing and execution are right.” With strong investor support and a clear roadmap, Synthflow is looking to turn AI phone agents into the new normal.
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