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Launched 2023 · Verified Oct 29, 2026

Synthflow

Verified Oct 29, 2026 Active
Voice Agents & Phone AIWrite a reviewGermanyEffect43/ 100
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Enterprise platform for building, testing and running AI voice agents that answer and place phone calls over its own telephony.

voice agentsai phone callscall automationivrtelephonyContact sales · from $30000/yr

Listed on EffectHub ·

Web · API

Pricing

Pricing model
Contact sales
Paid options from
$30000/yr
Billing
Yearly

The pricing page lists only an Enterprise tier, with contracts starting at $30,000 a year and final price scoped by call volume, concurrency, telephony, integrations and security needs; no self-serve per-minute plan is published.

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Overview

About Synthflow

Synthflow is a platform for AI voice and chat agents that handle phone work such as customer service, receptionist and answering-service calls, appointment booking and IVR replacement. Agents are designed in a visual Flow Designer, tested with simulated calls in a Test Center, launched over Synthflow's in-house telephony or SIP trunking, and monitored by automatic QA once live. Agents can transfer calls, book meetings, call external APIs, read from a knowledge base and remember contacts. An API and integrations with CRMs and tools like WhatsApp are available. Synthflow was founded in Berlin in 2023 and raised a $20 million Series A in 2025.

Platforms
Web · API
API
Yes
Last verified
Oct 29, 2026

Verified sources

Fact check

Is Synthflow legit?

We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.

TLS certificate
Issued by Google Trust Services, valid until Jan 27, 2027Seen in our own connection to the site on Oct 29, 2026
Last checked
Oct 29, 2026The site answered
On the market since
2023The vendor's own material, read by us
Operated by
Synthflow AI, GermanyOur research, card verified Oct 29, 2026

How we collect these records

Editorial verdict

Pros & cons of Synthflow

high confidence

Synthflow targets companies and BPOs that want to automate a real volume of phone calls with testing and QA around the agents. Small businesses wanting a cheap receptionist bot, or developers wanting pay-per-minute experiments, will find the $30,000 entry point too high.

Pros

  • Own telephony network as well as SIP trunking
  • Built-in simulated-call testing and automatic QA
  • Visual flow builder plus API and CRM integrations
  • Covers both voice and chat agents

Cons

  • No published self-serve plan or per-minute rate
  • Minimum annual contract of $30,000
  • Pricing depends on scoping with sales

Best for

  • Contact centres and BPOs automating inbound call volume
  • Enterprises replacing IVR menus with conversational agents
  • Healthcare, retail and financial services teams booking appointments by phone

Not for

  • Small businesses with low call volume
  • Developers who want to try voice agents on a pay-as-you-go basis

Watch out: Entry is an annual enterprise contract starting at $30,000, and the pricing page shows no self-serve or per-minute option, so third-party reviews quoting cheaper plans are out of date or unverified.

Synthflow head-to-head

Side-by-side fact sheets against the competitors our research or their makers name — pricing, platforms, API and both verdicts on one page.

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