Synthflow

Overview

Synthflow is a Berlin-based voice AI company, founded in 2023, that sells a no-code platform for building AI agents which handle phone calls. According to the company page and the June 2025 funding release, it was founded by Hakob Astabatsyan, Albert Astabatsyan and Sassun Mirzakhan-Saky, and it targets contact centers, business process outsourcing providers and mid-market companies. The company's website is https://synthflow.ai .

Why this entity matters

Customer service by phone is one of the largest cost centers in many industries, and voice AI is among the fastest-moving applications of generative models. Synthflow is one of the better-funded European startups in this field: Accel led its USD 20 million Series A in 2025, which Synthflow, Startbase and Call Centre Helper all report. For readers tracking where Berlin's AI sector is building products rather than models, Synthflow is an example of an application-layer company that sells reliability, latency and integrations to enterprises.

Company background

Synthflow's company page gives Berlin as its place of founding and 2023 as the founding year. A pre-seed round led by Atlantic Labs is listed on that page, followed by a seed round of USD 7.4 million announced on 27 June 2024, led by Singular with Atlantic Labs and AI investors participating (Synthflow; Startbase). On 25 June 2025 the company announced a USD 20 million Series A led by Accel with Atlantic Labs and Singular, bringing total funding to about USD 30 million (Synthflow; Startbase; Call Centre Helper). The funding release describes a white-label voice agent offering, a proprietary voice operating system and more than 200 integrations, and says the money would support international expansion including a US office. The company reports more than 1,000 customers, 45 million calls handled and 99.9 percent uptime; these are company statements that Startuprad.io has not independently verified. The company page lists about 70 employees, a figure from a single source. Startuprad.io has not independently verified revenue, valuation or customer names.

Role in the ecosystem

Synthflow belongs to the DACH conversational-AI and contact-center-automation segment. Berlin has a dense base of AI application startups and growth-stage investors, and Synthflow's pitch, which is to make AI phone agents reliable enough for regulated or sensitive use cases, fits the demand of European outsourcing providers and mid-sized firms that need GDPR-aware tooling. In the Startuprad.io interview the CEO also stressed that AI should be disclosed as AI and that humans stay involved for complex calls; these are the speaker's views as stated in the interview.

Selected relationships and affiliations

Public sources describe the following relationships. Accel led the 2025 Series A. Singular led the 2024 seed round and participated in the Series A. Atlantic Labs is described as an early backer that led the pre-seed round and took part in later rounds. Accel also has its own entity page in the Startuprad.io ledger. The scope of each investor relationship is as reported in the press and has not been independently detailed for this record.

Startuprad.io relevance

Startuprad.io lists two posts under the Synthflow tag. The December 2025 founder interview with Hakob Astabatsyan, titled around voice AI with memory and the contact-center breakthrough, covers the product, the memory approach for voice agents, visual call flows and the company's view of human-in-the-loop operations. A second post, published a few days later, is an interview with the CEO of the cancer-model startup CanChip about tumor-on-a-chip technology; Synthflow appears there only as a tag and a related-article link, so it is a weak mention rather than substantive coverage. The coverage is below the preferred depth of three articles.

Public source context

This record draws on Synthflow's company page at https://synthflow.ai/company and its Series A announcement at https://synthflow.ai/news/synthflow-raises-20m-series-a , Startbase's report on the 2025 round, Call Centre Helper's report on the round, Synthflow's 2024 seed announcement and Startuprad.io's own archive. Funding amounts and investors are as reported by those outlets. Technical performance claims and customer counts are company statements and have not been independently verified.

Startuprad.io coverage

Tumor on a Chip Explained: The Future of Cancer Drug Testing
Published: 11 December 2025
Last updated: 20 September 2026
Coverage type: Interview
https://www.startuprad.io/post/tumor-on-a-chip-explained-the-future-of-cancer-drug-testing

Synthflow’s Voice AI With Memory: The Contact Center Breakthrough
Published: 06 December 2025
Last updated: 21 September 2026
Coverage type: Interview
https://www.startuprad.io/post/synthflow-voice-ai-with-memory-the-contact-center-breakthrough

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Canonical record: https://www.startuprad.io/entities/synthflow .