Best for
Best for sales and customer-facing teams who want every call recorded and summarised on a free plan, and the follow-up written back into the CRM once it is worth paying for.
- Freelancers
- Small and mid-sized
- Enterprise
AI Voice & Speech Comparison
Fathom vs. Synthflow
At a glance
At a glance
Best for
Best for contact centres and outsourcers that want phone agents built, branded and launched under one contract.
- Enterprise
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | Fathom | Synthflow |
|---|---|---|
| Starting price | lower value Free plan; Premium $20 / user / month Premium is $16 per user per month billed annually. For teams, Team is $19 per user per month ($15 annually) and Business $34 ($25 annually), both with a two-user minimum. Enterprise is quoted. | From $30,000 / year Enterprise contracts start there and are scoped around call volume, concurrency, telephony setup, integrations, security needs and launch support. No self-serve tier is published. |
| Free trial | Free plan with unlimited recordings, transcription and AI summaries | Not stated |
| Commercial use | Not stated | Yes, under an enterprise contract |
| Output | Transcripts, AI meeting summaries, action items and follow-up emails | Voice and chat agents for inbound and outbound phone calls, including white-labelled agents resold under a partner's brand |
| API | Yes, a public REST API with webhooks and SDKs, plus an MCP server | Yes, a public Platform API, plus an MCP server for MCP-capable clients |
| Languages | Transcripts in 38 languages; summaries auto-translated into six | Over 30, plus a multilingual mode that switches languages within one call |
| Hosting | Cloud, with a desktop app for bot-free capture | Cloud, with region-based hosting |
| Voice cloning | No, Fathom records, transcribes and summarises meetings and does not synthesise or clone voices | Cloning happens in ElevenLabs, not in Synthflow. The voice selector offers Synthflow's own TTS with twelve built-in voices and the ElevenLabs models from Turbo v2 and Flash v2.5 up to v3; a cloned or provider-specific voice is added through Imported > Import Voice by pasting the provider voice ID, or by connecting your own ElevenLabs API key so that account's custom voices appear in the selector. The vendor warns that a synthesiser model your own ElevenLabs plan lacks can mean lower quality or higher latency on your key |
| Real-time use | Yes in the new experience, which shows a live summary that updates as the meeting runs; in the previous experience summaries and transcripts are generated once the recording has been processed | Yes, live inbound and outbound calls, with IVR handling for outbound agents, voicemail and silence handling, in-call SMS and WhatsApp messaging, and WhatsApp Business calling. The vendor states 99.99% uptime on its own telephony infrastructure |
| Speech-to-speech and dubbing | No speech-to-speech or dubbing; the translation covers written summaries only | Not documented. The voice documentation covers text-to-speech for live agents, with a speaker and a synthesis model chosen per agent, and carries no speech-to-speech conversion and no dubbing |
| Editing and controls | Chronological and enhanced summaries, advanced summaries from over fifteen templates including BANT and Sandler, AI action items and follow-up emails, clips and playlists, Ask Fathom chat over a single call or the whole account, keyword and AI search alerts, custom summary templates and a custom bot name | Flow Designer, a node-based canvas with conversation, message, branch, jump and custom action nodes, or a simpler prompt builder, plus a multi-agent system for several flows behind one agent, voice model and pacing settings, manual testing, automated simulations and custom evaluations that score calls against business goals |
| Consent and trust | A choice of bot or bot-free capture, a custom bot name and the option to disable the in-meeting banner on paid plans; Enterprise adds SSO, Okta SCIM provisioning, organisation-wide security controls, custom data retention policies and a signed HIPAA BAA | SOC 2, HIPAA, PCI DSS, GDPR and ISO 27001, with encryption, audit logs and region-based hosting. Per-agent controls decide whether recordings and transcripts are kept at all, cap retention at 30 days, and redact personal data from transcripts, webhook payloads and logs |
| MCP-ready | Yes | Yes |
| Deployment | Cloud (SaaS), Browser-based | Cloud (SaaS), Browser-based |
| Support | Email helpdesk | Email helpdesk |
| Onboarding | Documentation and knowledge base, Guided onboarding | Documentation and knowledge base, Personal consulting |
| Company size | more entries Freelancers, Small and mid-sized, Enterprise | Enterprise |
| Integrations | Zoom, Google Meet, Microsoft Teams, HubSpot, Salesforce, Slack, Asana, Zapier, Make, ChatGPT, Claude | HubSpot, Salesforce, Zapier, Cal.com, GoHighLevel, Twilio, Genesys, Avaya, Five9, Cisco, RingCentral |
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The short version
Key Differences
- Starting price Fathom Free plan; Premium $20 / user / month Synthflow From $30,000 / year
- Company size Fathom Freelancers, Small and mid-sized, Enterprise Synthflow Enterprise
- Hosting Fathom Cloud, with a desktop app for bot-free capture Synthflow Cloud, with region-based hosting
- Languages Fathom Transcripts in 38 languages; summaries auto-translated into six Synthflow Over 30, plus a multilingual mode that switches languages within one call
- Output Fathom Transcripts, AI meeting summaries, action items and follow-up emails Synthflow Voice and chat agents for inbound and outbound phone calls, including white-labelled agents resold under a partner's brand
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
Fathom
Strengths
- Free plan carries unlimited recordings, transcription and AI summaries
- Records without a bot in the call from the desktop app, or with one
- Transcripts in 38 languages
- Documented REST API with webhooks, SDKs and an MCP server
Limitations
- Transcription and summarisation only, with no voice synthesis, cloning or dubbing
- Summary translation covers six languages against the 38 it transcribes
- Team and Business plans carry a two-user minimum
- CRM field sync, coaching metrics and custom summaries start on the Business plan
Synthflow
Strengths
- No-code Flow Designer with a multi-agent system, so a non-developer can build and change call flows
- Connects to existing telephony and contact centre stacks over SIP, including Genesys, Avaya, Five9, Cisco and RingCentral
- White-labelled deployments for partners reselling voice agents under their own brand
- SOC 2, HIPAA, PCI DSS, GDPR and ISO 27001, with agent-level retention and PII redaction controls
Limitations
- No self-serve or trial tier is published; the only listed plan is an enterprise contract from $30,000 per year
- Pricing is scoped by sales, so the cost of a given call volume is not knowable from the website
- Latency figures differ between the vendor's own pages, so the published number is not a specification to rely on
- A cloned voice has to be created in a separate ElevenLabs account and imported, so it means a second subscription alongside Synthflow
Plans
Pricing
Fathom
- Free $0 Unlimited recordings and transcriptions, bot-free or bot capture, instant AI summaries, clips, playlists and search across calls.
- Premium $20 Per user per month, $16 billed annually. Adds advanced call summaries, AI action items, the conversational meeting assistant and a custom meeting bot.
- Team $19 Per user per month, $15 billed annually, two-user minimum. Adds global search across calls, team playlists and collaboration with comments, folders and keyword alerts.
- Business $34 Per user per month, $25 billed annually, two-user minimum. Adds CRM field sync, deal view, coaching metrics and AI scorecards and custom summaries.
- Enterprise Not stated Quoted. Adds the Launch Assist onboarding programme, organisation-wide security controls, SSO and SCIM provisioning, custom data retention and a dedicated success manager.
Synthflow
- Enterprise $30,000 Per year, the stated starting point. Scoped around call volume, concurrency, telephony setup, integrations and security needs, and covers implementation, onboarding, testing, training, launch support and ongoing optimisation, with SLA and support terms set in the contract.
What users say
Review Scores · opens after launch
Fathom
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.
Synthflow
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.
Where this comes from
Where this comes from
Fathom https://fathom.video · checked against the official source on 2026-09-16
Synthflow https://synthflow.ai · checked against the official source on 2026-09-13
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.