Synthflow
6.6/10Synthflow is an enterprise platform for AI voice agents that answer and place phone calls for contact centers, BPOs and multi-location brands.
Data last updated November 2026 · Our methodology
Overview
Synthflow is a Berlin-based platform for building AI voice agents that handle inbound and outbound phone calls. Agents can route calls, book appointments, detect voicemail, send SMS follow-ups, and update CRM records during the conversation. When a call needs a person, the agent transfers it with the full transcript. Agents are built in a no-code visual builder and draw on a knowledge base of your documents and websites. They call your systems through actions, webhooks and an API. Chat agents for websites and apps are available, and SMS and WhatsApp agents are offered in US workspaces. Synthflow connects natively to Zoom Phone, Five9, RingCentral, 8x8, Twilio, Telnyx, Vonage and Freshcaller, and to Salesforce, HubSpot, Zendesk and Freshworks. Genesys and other SIP systems connect through an enterprise setup. The vendor reports SOC 2 Type II, ISO 27001, ISO 42001 and PCI DSS compliance, and offers a HIPAA BAA, a GDPR DPA, and a choice of US or EU data region. Named customers include Batteries Plus, Thryv, Yardi and YMCA. Synthflow once sold self-serve monthly plans with included minutes. Now it sells only annual enterprise contracts, with no free plan or trial and no public price. A competitor's review dated September 2026 puts the minimum contract at about 30,000 USD a year. The main limitation is that the platform is now out of reach for small businesses and solo agencies. Users on Trustpilot also report slow support and billing problems after cancelling.
Our Rating
Who Synthflow is best for
Best software for Customer Support TeamsGood fit
It is built to answer and resolve routine support calls, hand off to people with context, and plug into contact-center phone systems.
It is sold only as an annual enterprise contract and includes SSO, compliance certifications, data-region choice and forward-deployed engineers.
A HIPAA BAA and a HIPAA setting are available, and BioReference is listed as a customer.
Less suited
White-label branding for BPOs and software platforms is included, but the high contract minimum and reported white-label support issues shrink the fit for small agencies.
- Real Estate6/10
Yardi and Aareon are named customers, and appointment booking and lead calls fit property workflows.
There is no self-serve plan or trial anymore, and a reported minimum of about 30,000 USD a year puts it out of reach for most small firms.
Pros & Cons
Pros
- Native connectors for Zoom Phone, Five9, RingCentral, 8x8, Twilio and other phone systems let companies keep their existing numbers and carrier.
- Its compliance coverage is broad: SOC 2 Type II, ISO 27001, ISO 42001, PCI DSS, a HIPAA BAA, and a choice of US or EU data region.
- The no-code builder lets non-developers set up call flows, as G2 and Trustpilot reviewers note.
- Its references show large rollouts, such as Batteries Plus across 700+ US locations after a five-week pilot.
- The vendor claims replies within 500 ms, and some reviewers praise its voice quality and low latency.
- Call, API and webhook logs, CSV export and PCAP SIP traces help with troubleshooting.
Cons
- There is no public price, trial or self-serve plan. A competitor review reports a minimum of about 30,000 USD a year.
- Trustpilot reviewers in 2025 and 2026 report slow or missing support replies.
- Several users say they kept being billed after cancelling.
- Some users report reliability problems, including dropped calls, outages, hallucinations and failing webhook or SMS integrations.
- Phone calls come first: SMS and WhatsApp agents are limited to US workspaces.
- No on-premises or private deployment option is documented.
Key Features
Synthflow Pricing
Enterprise
- MSA and DPA support
- Custom concurrency planning
- White-label branding for BPOs and software platforms
- SSO via Okta, Microsoft Entra ID, Google SAML and Auth0
- CRM, calendar and other integrations scoped in the contract
- Launch support from forward-deployed engineers where included
- Native telephony, SIP trunking or approved enterprise telephony
- Annual enterprise agreement only, no free plan, trial or per-minute rate
Frequently Asked Questions
No. The pricing page says every new deployment starts on an annual enterprise agreement, with no free plan, no trial and no per-minute rate.
Synthflow does not publish prices. You get a quote based on your call volume, phone system, integrations and security needs. A competitor review dated September 2026 reported a minimum of about 30,000 USD a year.
It connects natively to Zoom Phone, Five9, RingCentral, 8x8, Twilio, Telnyx, Vonage and Freshcaller. Genesys Cloud and other SIP systems connect through an enterprise setup. Business integrations include Salesforce, HubSpot, Zendesk and Freshworks, plus APIs and webhooks, and the vendor cites more than 200 integrations.
Synthflow offers a HIPAA business associate agreement, though the HIPAA setting is off by default and must be turned on. A GDPR data processing agreement is also available. The company is SOC 2 Type II audited and lists ISO 27001, ISO 42001 and PCI DSS compliance.
You choose a US or EU workspace when you set it up, and data is stored and processed in that region. Connected providers may process some requests elsewhere. Hosting runs on AWS, Google Cloud and Microsoft Azure.
Yes. SSO is available on Enterprise plans through Okta, Microsoft Entra ID, Google SAML and Auth0, and admins can require two-factor authentication for all members.
Yes, within limits. Chat agents can run on websites and apps, and SMS and WhatsApp agents are offered in US workspaces. Phone calls remain the main focus.
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