Best for
Best for teams who need every meeting written up, summarised and pushed into the tools where the follow-up actually happens.
- Freelancers
- Small and mid-sized
- Enterprise
AI Voice & Speech Comparison
Otter.ai 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 | Otter.ai | Synthflow |
|---|---|---|
| Starting price | lower value Free tier, then from $8.33 / user / month The $8.33 Pro rate is billed annually; paid monthly it is $16.99. Business is $19.99 / user / month billed annually or $30 monthly. The free Basic plan carries 300 transcription minutes a month and 3 lifetime file imports. | 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 Basic plan with 300 monthly transcription minutes | Not stated |
| Commercial use | Not stated | Yes, under an enterprise contract |
| Output | Live transcripts, meeting summaries and action items | Voice and chat agents for inbound and outbound phone calls, including white-labelled agents resold under a partner's brand |
| API | On Enterprise | Yes, a public Platform API, plus an MCP server for MCP-capable clients |
| Languages | One language per conversation; the set includes English (US and UK), Spanish, French and Japanese | Over 30, plus a multilingual mode that switches languages within one call |
| Hosting | Cloud, with desktop apps for Mac and Windows, mobile apps and a Chrome extension | Cloud, with region-based hosting |
| Voice cloning | No, Otter transcribes and summarises speech 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, live transcription and captions during the meeting, either with Otter joining the call or recording from the desktop app without a bot | 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 dubbing or speech-to-speech translation | 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 | Speaker identification, meeting summaries with decisions and action items, AI Chat across past meetings and connected apps, workflow agents for sales and recruiting, and playback speeds from 0.5x to 3x with skip-silence on paid plans | 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 | Enterprise adds SSO and SCIM, admin controls over access policies and sharing, audit logging, and an opt-out from AI model training arranged through an account manager | 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 | Not stated | Email helpdesk |
| Onboarding | Documentation and knowledge base | more entries Documentation and knowledge base, Personal consulting |
| Company size | more entries Freelancers, Small and mid-sized, Enterprise | Enterprise |
| Integrations | more entries Zoom, Microsoft Teams, Google Meet, RingCentral, HubSpot, Salesforce, Microsoft Dynamics, Salesloft, Outreach, Slack, Notion, Asana, ClickUp, Jira, monday.com, Google Calendar, Microsoft Outlook, Google Drive, Dropbox, Microsoft OneDrive, SharePoint, Amazon S3, Snowflake, Zapier | HubSpot, Salesforce, Zapier, Cal.com, GoHighLevel, Twilio, Genesys, Avaya, Five9, Cisco, RingCentral |
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Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.
The short version
Key Differences
- Starting price Otter.ai Free tier, then from $8.33 / user / month Synthflow From $30,000 / year
- Company size Otter.ai Freelancers, Small and mid-sized, Enterprise Synthflow Enterprise
- Hosting Otter.ai Cloud, with desktop apps for Mac and Windows, mobile apps and a Chrome extension Synthflow Cloud, with region-based hosting
- Languages Otter.ai One language per conversation; the set includes English (US and UK), Spanish, French and Japanese Synthflow Over 30, plus a multilingual mode that switches languages within one call
- Output Otter.ai Live transcripts, meeting summaries and action items 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
Otter.ai
Strengths
- Records without a bot in the call from the desktop app
- Summaries and action items sync into CRM, chat and project tools
- MCP server exposes meeting data to Claude and ChatGPT
- Free plan with 300 transcription minutes a month
Limitations
- Transcription only, no text-to-speech or voice cloning
- A small number of languages, and only one per conversation
- Per-meeting length caps on the lower plans: 30 minutes on Basic and 90 on Pro
- API access is reserved for Enterprise
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
Otter.ai
- Basic Free 300 transcription minutes a month, 30 minutes per conversation, 3 lifetime audio or video file imports, and the 25 most recent conversations retained.
- Pro $8.33 Per user per month billed annually, or $16.99 billed monthly. 1,200 in-app recording minutes a month, 10 file imports a month, up to 90 minutes per meeting, unlimited storage and playback speeds from 0.5x to 3x.
- Business $19.99 Per user per month billed annually, or $30 billed monthly. Unlimited meetings and in-app recordings, unlimited file imports, up to 4 hours per meeting, three concurrent meetings and admin features.
- Enterprise Not stated Custom pricing arranged through a demo. Adds SSO and SCIM, audit logging, admin controls, API access, video replay, unlimited custom AI workflows and a HIPAA compliance add-on.
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
Otter.ai
- 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
Otter.ai https://otter.ai · checked against the official source on 2026-09-04
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.