“Indistinguishable from a human voice”: Berlin-based Synthflow AI raises €17.2 million for its AI voice agent

German startup Synthflow AI, a voice AI platform for automated phone calls, today announced a €17.2 million Series A investment round to drive the next wave of enterprise adoption for AI voice agents.

The round is led by Accel, with participation from existing investors Atlantic Labs and Singular. This follows the company’s Seed round last year, bringing the total funding to €25.8 million. The new capital will support global expansion, including the opening of a new office in the US, and accelerate development of its best-in-class voice AI agent platform.

Hakob Astabatsyan, Co-founder and CEO of Synthflow AI, said: “Businesses and their customers are becoming increasingly comfortable communicating with AI agents. Our mission at Synthflow AI is to make high-quality, low-cost AI voice agents more accessible to improve customer services everywhere.

“The BPO and contact centre market represents a massive opportunity for us, and we’re already experiencing significant growth in this sector thanks to the simplicity of our no-code platform and the reliability and quality of our AI voice agents. This funding will help us accelerate this growth and scale our product so that we can continue pioneering Voice AI technology globally.”

Founded in 2023 by serial entrepreneurs Albert Astabatsyan, Hakob Astabatsyan, and Sassun Mirzakhan-Saky, Synthflow AI looks to democratise access to advanced voice AI with a no-code platform that lets enterprises create, deploy and scale natural-sounding, cost-effective voice agents tailored to their business needs.

Designed for non-technical users, Synthflow AI’s white-label voice agents reprotedly require zero code, are highly customisable, and can handle tasks like simple inquiries to complex workflows including customer support, appointment scheduling, inbound lead qualification, AI-to-human call transfers, and collecting and sharing real-time information at scale.

With over 200 integrations across calendars, CRMs and telephony systems, Synthflow AI says it can be implemented rapidly and cost-effectively, “a contrast to the typical six-month onboarding required by legacy vendors.“

Synthflow AI’s AI Voice OS is built to be indistinguishable from a human voice. It can handle complex, high-value use cases with no human intervention. Since its Seed round, Synthflow AI has expanded its R&D team to further boost product performance and has scaled to integrate with business process outsourcing (BPO) providers and contact centres worldwide.

Luca Bocchio, Partner at Accel, added: “Voice AI is at a real inflexion point, voice agents have been improving rapidly and have never been more cost-effective to deploy. The Synthflow AI team is seising the moment from legacy players by making this technology more accessible. The market opportunity for deploying voice agents in traditional customer support use cases is vast and, as infrastructure continues to evolve and AI capabilities improve further, new emerging use cases in areas such as healthcare, financial services, education and more will continue to open up.

“Hakob and the team’s technical expertise and momentum so far have been impressive. We’re delighted to be investing in their vision and joining the journey ahead.”

Recent breakthroughs have made it viable for enterprises to deploy AI voice agents at scale across a wide range of use cases. From customer service to appointment scheduling and lead qualification, these agents have the potential to transform global operations, delivering exceptional support at a fraction of the cost.

For contact centres and BPO companies that dominate the €137 billion US customer service market, this shift presents a major growth opportunity, driven by always-on voice agents that deliver natural conversations.

Synthflow argues that until now, deploying this technology while standing out in an increasingly crowded space has been a challenge, demanding deep AI expertise, specialised teams, inflated budgets, and drawn-out onboarding.

Synthflow AI agents have delivered measurable impact:

• Over 5 million hours of contact centre operations saved
• 35% more calls answered compared to non-AI operators
• 45 million calls handled with a 99.9% uptime

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