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Voice AI agents7 reviewsprofile updated Oct 8, 2026

Synthflow

Voice AI platform for enterprise phone automation, with no-code agent building and sales-led annual contracts. By Synthflow.

Too few public reviews to rate. We found 7 reviews about the AI itself; a share needs 10 that mention the point. The profile below sets out what Synthflow publishes.

What reviewers say

7 public reviews about the AI, from Trustpilot. Each share counts the reviews that mention the point.

Read with care. About 140 reviews posted in one week of February 2025 were left out: two reviewers in that batch said they were given free minutes for reviewing. The reviews that remain are few and mostly negative.

Does the job

0 of 3too few to rate

Accuracy

0 of 1too few to rate

Handoff to a person

–too few to rate

Cost

0 of 3too few to rate

Setup and upkeep

–too few to rate

Complaints

“The AI agents suffer from severe hallucinations, frequently deviating from their programmed instructions”
Small Business OwnerTrustpilot · May 2026 · 1/5− Job− Accuracy
“I cancelled my subscription over 5 moths ago and continue to get billed each month.”
Tyler C.Trustpilot · Apr 2026 · 1/5− Cost
“the tools you actually need are locked behind their absurdly overpriced enterprise plan.”
Dan M.Trustpilot · Aug 2025 · 1/5− Cost
“The voice is the best I've found, unfortunately the entire rest of the platform is glitchy”
Keith D.Trustpilot · May 2025 · 2/5− Job
“Our bots went down over a week ago and they will not get back to me over me trying to pay them money!”
Michael H.Trustpilot · Mar 2025 · 1/5− Job
“I got charged for the free plan and even after cancelling the subscription I got charged Again.”
NSTrustpilot · Mar 2025 · 1/5− Cost

All 7 coded reviews of Synthflow

What it does

Synthflow builds AI agents that answer and place phone calls, and the same agents run on chat and SMS1. Agents connect to a company's own telephony or any SIP provider1. Synthflow says its forward-deployed engineers help launch agents1.

Channels
Voice, Chat, SMS, WhatsApp
Works with
Telephony and contact center systems Cisco, Avaya, Genesys and RingCentral, any SIP provider, and CRMs such as Salesforce and HubSpot1. Docs cover Genesys Cloud, Five9, Salesforce, HubSpot, GoHighLevel and Freshworks2.

Handing a conversation to a person

As Synthflow documents it. Reviewers' experience of handoffs is in the shares above.

Cold transfer hands the call off over SIP REFER without speaking to the person3. Warm transfer plays either a whisper message or an AI-generated summary of the conversation to the person before connecting, and the person can accept or decline the call3. SIP transfers can attach custom X-headers with data such as a reference ID3. Transfer destinations are chosen by conditions such as "caller asks for billing", with an out-of-hours message when no one is available3.

Controls

Safety and review features, as Synthflow documents them.

  • Changes save to a draft; publishing shows what the draft adds and removes against the live version, and any earlier version can be restored4.
  • The Test Center runs simulated calls with an AI customer and marks each success criterion passed or failed, with up to 25 test cases per suite5.
  • PII redaction removes card numbers, Social Security numbers, names, emails, phone numbers and addresses from transcripts, webhooks and logs; live audio is not affected6.
  • Options to stop saving recordings or transcripts, and to delete transcripts, recordings and caller IDs after 30 days6.
  • Synthflow lists SOC 2, HIPAA, PCI DSS and GDPR, plus audit logs and region-based hosting1.

Setup

Agents can be built for free with templates before launch1. Synthflow says its forward-deployed engineers launch agents in weeks, not months1.

What Synthflow claims

The vendor's own figures. Shown as claims; never used in a result.

  • Synthflow says it has handled more than 500 million customer calls and runs at 99.99% uptime1.
  • Synthflow says its agents give zero off-script or hallucinated responses1.
  • Synthflow says Freshworks automated 65% of routine calls and cut wait times by 75%1.
  • Synthflow says customers see measurable ROI in the first 60 days1.

Not found in public sources

We looked for these and could not find them.

  • Per-minute rate and overage rate
  • Content guardrails or blocked topics beyond following approved knowledge sources

Sources

  1. [1]Synthflow home pageSynthflow · accessed Oct 8, 2026
  2. [2]Documentation indexSynthflow · accessed Oct 8, 2026
  3. [3]Call transfersSynthflow · accessed Oct 8, 2026
  4. [4]Version controlSynthflow · accessed Oct 8, 2026
  5. [5]SimulationsSynthflow · accessed Oct 8, 2026
  6. [6]Security and complianceSynthflow · accessed Oct 8, 2026
  7. [7]PricingSynthflow · accessed Oct 8, 2026
  8. [8]BillingSynthflow · accessed Oct 8, 2026

Billing

Per minute

Sales-led annual contracts that start at $30,000 a year, with final price set by call volume, concurrency, telephony and integrations7. Usage is counted in minutes against a contracted allocation, with overage per extra minute8.

What counts: Minutes used in the contract period count against the allocation; calls after the allocation runs out are billed at a per-minute overage rate that is not published8.

The headline rate may leave out the model, speech and phone-line costs.

How AI support is billed

Reviews found

About the AI
7
Sources
1
Collected
Oct 8, 2026
Where we looked
  • Trustpilot synthflow.ai: pages 1-4, 7 and 9 read (about 120 of 215); 7 qualifying
  • Trustpilot burst of Feb 5-13, 2025 (pages 2-8, about 140 reviews) excluded as incentivized: reviewers wrote 'i will get free mins after review' and 'Makes me put review for free mins'
  • Trustpilot reviews before 2024-10-01 (page 9) out of window
  • Reddit: blocked
  • Hacker News comments: mentions only
  • G2: 403

Also in Voice

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