Best for
Best for realistic long-form narration, dubbing and voice cloning.
- Freelancers
- Small and mid-sized
- Enterprise
AI Voice & Speech Comparison
ElevenLabs 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 | ElevenLabs | Synthflow |
|---|---|---|
| Starting price | Free tier; Starter from ~$5 / month Commercial rights start with the paid Starter tier. API from around $300 per million characters at low volume. | 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 tier, restricted | Not stated |
| Commercial use | From the paid Starter tier | Yes, under an enterprise contract |
| Output | Realistic narration, voice cloning from a sample of around one minute, 70+ languages, dubbing | Voice and chat agents for inbound and outbound phone calls, including white-labelled agents resold under a partner's brand |
| API | Yes | Yes, a public Platform API, plus an MCP server for MCP-capable clients |
| Hosting | Not stated | Cloud, with region-based hosting |
| Voice cloning | Yes, from a sample of around one minute | 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. Eleven Flash v2.5 is built for real-time use at around 75 ms latency, Eleven v3 Conversational runs at around 280 ms, Scribe v2 Realtime transcribes at around 150 ms, and the ElevenAgents platform runs live voice agents over phone, chat and messaging channels | 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 |
| Languages | 70+ languages on Eleven v3 and Eleven v3 Conversational, 32 on Flash v2.5 and 29 on Multilingual v2; speech to text with Scribe v2 covers 90+ | Over 30 languages are listed in the documentation, plus a multilingual mode that switches between English, Spanish, French, German, Hindi, Russian, Portuguese, Japanese, Italian and Dutch within a single call. Speech recognition runs on Deepgram or Synthflow's own engine, which the vendor recommends for non-English |
| Speech-to-speech and dubbing | Yes, speech-to-speech and dubbing | 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 | Stability set to Creative, Natural or Robust, speed from 0.7x to 1.2x, audio tags such as [whispers] or [excited] to direct delivery, a seed value for repeatable output, and pronunciation set through IPA, phoneme tags or an uploaded pronunciation dictionary | 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 | Professional voice cloning is gated behind technological verification of the speaker, cloning of celebrity and other high-risk voices is blocked, and an AI Speech Classifier tells whether a clip was made with ElevenLabs | 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 | more entries Email helpdesk, Community forum | 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 Twilio, Genesys Cloud, Five9, Vonage, LiveKit, Salesforce, HubSpot, Zendesk, Intercom, Freshdesk, ServiceNow, Jira, Slack, Telegram, Google Calendar, Google Drive, Cal.com, Calendly | HubSpot, Salesforce, Zapier, Cal.com, GoHighLevel, Twilio, Genesys, Avaya, Five9, Cisco, RingCentral |
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The short version
Key Differences
- Starting price ElevenLabs Free tier; Starter from ~$5 / month Synthflow From $30,000 / year
- Company size ElevenLabs Freelancers, Small and mid-sized, Enterprise Synthflow Enterprise
- Support ElevenLabs Email helpdesk, Community forum Synthflow Email helpdesk
- Commercial use ElevenLabs From the paid Starter tier Synthflow Yes, under an enterprise contract
- Output ElevenLabs Realistic narration, voice cloning from a sample of around one minute, 70+ languages, dubbing 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
ElevenLabs
Strengths
- Most realistic voice and cloning
- 70+ languages on the v3 models
- Speech-to-speech and dubbing
- Strong API
Limitations
- Commercial use only from the paid Starter tier
- API pricey at high volume
- Credits are shared across every product and roll over for at most two months
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
ElevenLabs
- Free $0 Restricted, no commercial rights.
- Starter ~$5 Per month. Commercial rights start here.
- API From ~$300 Per million characters at low volume.
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
ElevenLabs
- 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
ElevenLabs https://elevenlabs.io · checked against the official source on 2026-08-21
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.