Synthflow
Berlin voice AI agent platform for phone calls, free to build, priced by deployment
Quick Overview
| Company | AgentFlow AI GmbH, trading as Synthflow AI |
|---|---|
| Category | AI Voice & Speech |
| Headquarters | Berlin, Germany |
| EU Presence | EU (Germany) |
| Data Location | EU and US hosting options for deployed agents |
| Open Source | No |
| Compliance | SOC 2, HIPAA, GDPR, PCI DSS, ISO 27001 |
| Pricing | Free to build agents in the platform; deployment billed pay-as-you-go, Enterprise plans from about $30,000/year |
| Free Option | Free to build and test agents; billed only once deployed |
| Replaces | Vapi, Bland AI, Retell AI |
Detailed Review
Synthflow is a Berlin company, legally AgentFlow AI GmbH, selling a no-code platform for building AI voice agents that make and take phone calls: customer service, sales, appointment booking and call routing, aimed at businesses that want to automate a call-centre function without hiring developers.
It has positioned itself for scale rather than experimentation, citing more than 65 million voice calls handled monthly across 30-plus countries, and it sits close to Parloa's enterprise contact-centre market from a smaller, more self-serve starting point.
Building an agent is free: the platform's own FAQ states customers can design a call flow from an industry template or from scratch at no cost, and charges only start once an agent goes live and starts taking real calls.
Published pricing beyond that point is a single Enterprise plan starting at $30,000 a year, customised by call volume, concurrency, telephony setup and integration needs — so the free tier is really a sandbox for evaluating the product before a serious annual commitment.
Certifications run to SOC 2, HIPAA, GDPR, PCI DSS and ISO 27001, with a choice of EU or US hosting for deployed agents, and the German registration sits underneath English-language marketing that talks about US, UK, EU and Canadian operations. The $30,000 floor puts it well above Voicemod's few euros a month or Speechmatics' pay-as-you-go tier, and firmly in the same enterprise bracket as Parloa rather than a self-serve tool for a small business.
What Synthflow does well
- Free to design and test call flows before paying
- Handles 65M+ voice calls monthly across 30+ countries (vendor claim)
- Choice of EU or US hosting for deployed agents
- SOC 2, HIPAA, GDPR, PCI DSS and ISO 27001 certified
- No-code builder with industry call-flow templates
Where Synthflow falls short
- Enterprise plan starts at $30,000/year once agents go live
- No published self-serve pricing beyond the free build stage
- German company marketed mainly around US/UK enterprise use cases
- Overlaps closely with Parloa in the same category
Standout feature. Free to build an agent, then a single Enterprise plan from $30,000 a year once it starts taking real calls.
Pros and Cons
Pros
- Free to design and test call flows before paying
- Handles 65M+ voice calls monthly across 30+ countries (vendor claim)
- Choice of EU or US hosting for deployed agents
- SOC 2, HIPAA, GDPR, PCI DSS and ISO 27001 certified
- No-code builder with industry call-flow templates
Cons
- Enterprise plan starts at $30,000/year once agents go live
- No published self-serve pricing beyond the free build stage
- German company marketed mainly around US/UK enterprise use cases
- Overlaps closely with Parloa in the same category
Alternatives to Synthflow
Frequently Asked Questions
What is Synthflow?
Synthflow is a Berlin company, legally AgentFlow AI GmbH, selling a no-code platform for building AI voice agents that make and take phone calls: customer service, sales, appointment booking and call routing, aimed at businesses that want to automate a call-centre function without hiring developers.
It has positioned itself for scale rather than experimentation, citing more than 65 million voice calls handled monthly across 30-plus countries, and it sits close to Parloa's enterprise contact-centre market from a smaller, more self-serve starting point.
Where is Synthflow based?
Synthflow operates from Berlin, Germany, which places it under EU (Germany). Compliance: SOC 2, HIPAA, GDPR, PCI DSS, ISO 27001.
What does Synthflow cost?
Free to build agents in the platform; deployment billed pay-as-you-go, Enterprise plans from about $30,000/year. Free to build and test agents; billed only once deployed.
Who is Synthflow best for?
Businesses automating phone calls with a no-code voice agent. Free to build an agent, then a single Enterprise plan from $30,000 a year once it starts taking real calls.
What are the drawbacks of Synthflow?
Enterprise plan starts at $30,000/year once agents go live. No published self-serve pricing beyond the free build stage. German company marketed mainly around US/UK enterprise use cases. Overlaps closely with Parloa in the same category.
Is Synthflow a good alternative to Vapi?
Synthflow is built as a European alternative to Vapi: Berlin voice AI agent platform for phone calls, free to build, priced by deployment. It will not be a like-for-like feature match in every respect, so check the review above for where the two genuinely differ before switching.
How does Synthflow compare to other AI Voice & Speech tools?
Synthflow is one of several European AI Voice & Speech tools we cover. It is most often compared with Vapi, Bland AI, Retell AI.