Synthflow is an enterprise Voice AI platform for phone call automation, with enterprise contracts from $30,000 per year. Features, integrations, pros and cons.
Researched and fact-checked by Bartu Cavusoglu · Updated October 26, 2026
Synthflow is a Voice AI platform that builds and runs AI agents for automated phone calls. The company describes it as an end-to-end system with its own telephony, a deployment framework, and tools for building, testing, and monitoring agents. It is aimed at enterprises that handle high call volumes in support, sales, scheduling, and call routing.
Synthflow was founded in Berlin in 2023 and started with voice before adding chat agents. The company reports 70 employees and $30M in total funding, including a $20 million Series A led by Accel in 2025. The website is available in English and German.
Synthflow organizes the agent lifecycle in its BELL Framework. Teams build flows in a visual Flow Designer and connect APIs. Agents are then evaluated with simulated calls in the Test Center, which measure accuracy, response quality, and compliance against KPIs. After launch, Auto-QA and monitoring analyze conversations so insights can feed the next agent version.
Calls run through Synthflow's own telephony network, which the company says delivers sub-100 ms latency. It works alongside an existing SIP or PBX setup, and customers can bring their own carriers or SIP trunks. The FAQ separately cites sub-500ms latency for the full agent experience, so buyers should confirm which figure applies.
The multi-agent system lets teams split complex logic into subflows that act as specialized agents. The AI Sandbox tracks every agent version and supports previewing, comparing, and rolling back changes without downtime. Real-time monitoring shows every call, webhook, and API request, which helps teams debug faster after launch.
Synthflow also supports chat, SMS, and voice from one platform. Its agents follow defined logic and approved knowledge sources to keep answers on script. Certifications listed include SOC 2, HIPAA, PCI DSS, and GDPR, with encryption, audit logs, and region-based hosting. Data fine-tuning on a customer's own calls is described as a coming capability.
Synthflow is an enterprise Voice AI platform for building and running AI agents that handle phone calls. Agents can route calls, book appointments, detect voicemail, and send SMS follow-ups. The platform also supports chat agents and runs on Synthflow's own telephony network.
Synthflow lists one Enterprise tier, with contracts starting at $30,000 annually. Final pricing is scoped around call volume, concurrency, telephony setup, integrations, security needs, and launch support. Interested buyers contact sales for a quote.
The sources do not mention a free plan or free trial. The site directs buyers to request a demo and talk with the sales team about their rollout.
Synthflow lists 200+ integrations. Examples include Salesforce, HubSpot, Zoho, Genesys, Five9, RingCentral, Cisco, Avaya, Twilio, Google Calendar, Zapier, Make, and Zendesk. It also connects to any SIP-based provider.
Synthflow states its infrastructure is certified across SOC 2, HIPAA, PCI DSS, and GDPR. It also lists encryption, audit logs, and region-based hosting. Enterprise contracts include MSA/DPA support and a security review.
Synthflow is built for enterprises with high call volumes, including BPOs, retail, financial services, healthcare, real estate, software, and telecom companies. It also suits software vendors that want to embed white-labeled voice agents.
The published pricing starts at $30,000 per year and is scoped per contract, so Synthflow is positioned for enterprises. Small businesses with low call volume may find the entry cost high and should compare lighter-weight options.
Synthflow was founded in Berlin, Germany, in 2023. The company reports 70 employees and $30M in total funding, including a $20 million Series A led by Accel in 2025.