Major takeaways
Who should pick Synthflow over ElevenLabs? Operations teams that need a visual builder for appointment booking, lead qualification, or reminder calls without writing code.
Who should pick ElevenLabs over Synthflow? Developers building custom voice products who need API-first control, advanced voice cloning, and flexible model integration.
How do their pricing models differ? Synthflow charges per minute with bundled telephony; ElevenLabs bills separately for platform access, voice generation, and telephony through third-party providers.
If you care about X, pick Y
| If you care about | Pick | Why |
|---|---|---|
| No-code visual builder | Synthflow | Drag-and-drop flow builder; no coding required for agent creation |
| Developer API control | ElevenLabs | API-first architecture with granular control over voice, latency, and model selection |
| Pricing transparency | Synthflow | Published per-minute rates include telephony; ElevenLabs requires separate calculation of voice generation, API calls, and carrier costs |
| Voice and model choice | ElevenLabs | 32+ voices, custom voice cloning, bring-your-own LLM support; Synthflow uses vendor-selected models |
| Outbound campaign tooling | Synthflow | Built-in campaign scheduler and list management; ElevenLabs requires external orchestration |
| Enterprise compliance documentation | ElevenLabs | SOC 2 Type II and GDPR published; Synthflow compliance statements not publicly detailed |
How we evaluated
We reviewed vendor documentation, pricing pages, and public review coverage on G2, Trustpilot, and TrustRadius for both platforms. Evaluation criteria included build experience (no-code vs API), telephony integration, LLM and voice flexibility, published pricing, compliance certifications, and user-reported strengths and gaps. No test calls were placed; all performance claims are attributed to vendor statements or third-party sources. Last updated: November 2026.
What each platform does
ElevenLabs
ElevenLabs is a voice AI platform built for developers and enterprises that need high-quality voice synthesis and conversational agents. Users build agents via API or a low-code interface, choosing from 32+ voices or creating custom clones.
The platform supports inbound and outbound calls through third-party telephony providers like Twilio or Vonage. ElevenLabs states it serves over 1 million users globally and has raised $80M in funding. Source: ElevenLabs
Synthflow
Synthflow is a no-code AI voice agent builder designed for operations teams automating appointment booking, lead qualification, and customer support. Users create agents in a visual flow builder without coding, connecting to calendars, CRMs, and phone numbers. The platform bundles telephony and reportedly supports 30+ languages.
Synthflow states it serves small and mid-market businesses across healthcare, real estate, and professional services. Source: Synthflow
Feature comparison
| Capability | ElevenLabs | Synthflow |
|---|---|---|
| Build model | API-first, low-code interface | No-code visual flow builder |
| Inbound calls | ✓ via third-party telephony | ✓ bundled telephony |
| Outbound calls / campaigns | ✓ via API orchestration | ✓ built-in campaign scheduler |
| Telephony | Bring-your-own (Twilio, Vonage, etc.) | Bundled phone numbers and carrier |
| LLM choice | Bring-your-own or vendor-hosted | Vendor-selected models |
| Voice / TTS provider and cloning | 32+ voices, custom cloning, API control | Vendor-selected voices, limited cloning |
| Languages | 29 languages (vendor claim) | 30+ languages (vendor claim) |
| Interruption handling | Configurable turn-taking, low latency | Basic interruption support |
| Warm transfer / human handoff | ✓ via API logic | ✓ built-in transfer rules |
| Function calling / tool use | ✓ API webhooks, CRM lookups | ✓ calendar, CRM integrations |
| CRM and calendar integrations | API-based, custom builds | Native Calendly, HubSpot, Salesforce |
| Call recording and analytics | ✓ via third-party storage | ✓ built-in dashboard |
| Compliance statements | SOC 2 Type II, GDPR | Not publicly detailed |
| Concurrency limits | Not publicly listed | Not publicly listed |
Pricing and cost per minute
ElevenLabs pricing
ElevenLabs charges separately for platform access, voice generation, and telephony. The Free tier includes 10,000 characters per month of voice generation. The Starter plan costs $5 per month for 30,000 characters. The Creator plan costs $22 per month for 100,000 characters.
The Pro plan costs $99 per month for 500,000 characters. Enterprise pricing is custom. Voice generation is billed per character; conversational AI usage is billed per minute of audio processed. Telephony costs are separate and depend on the third-party provider (Twilio, Vonage). Source: ElevenLabs Pricing
| Tier | Monthly cost | Voice characters | Conversational AI minutes | Telephony |
|---|---|---|---|---|
| Free | $0 | 10,000 | Limited | Separate (BYOC) |
| Starter | $5 | 30,000 | Pay-per-use | Separate (BYOC) |
| Creator | $22 | 100,000 | Pay-per-use | Separate (BYOC) |
| Pro | $99 | 500,000 | Pay-per-use | Separate (BYOC) |
| Enterprise | Custom | Custom | Custom | Separate (BYOC) |
Synthflow pricing
Synthflow charges per minute with bundled telephony. The Starter plan reportedly costs $29 per month for 100 minutes. The Professional plan reportedly costs $99 per month for 500 minutes. The Business plan reportedly costs $499 per month for 3,000 minutes. Enterprise pricing is custom.
Per-minute rates include phone numbers, carrier costs, and LLM inference. Overage is billed at the plan's per-minute rate. Source: third-party estimates; Synthflow does not publish a public pricing page
| Tier | Monthly cost | Included minutes | Per-minute rate (estimated) | Telephony |
|---|---|---|---|---|
| Starter | $29 | 100 | ~$0.29 | Bundled |
| Professional | $99 | 500 | ~$0.20 | Bundled |
| Business | $499 | 3,000 | ~$0.17 | Bundled |
| Enterprise | Custom | Custom | Custom | Bundled |
What a month of calls might cost
To estimate monthly spend, calculate: (average call length in minutes) × (calls per month) × (all-in per-minute rate) + platform fees + telephony overages.
For ElevenLabs, the all-in per-minute rate includes voice generation (billed per character, roughly 150–200 characters per minute of speech), conversational AI processing (vendor-quoted per-minute rate, not publicly listed), and telephony (Twilio inbound: ~$0.0085/min, outbound: ~$0.013/min). A worked example with illustrative assumptions: 200 calls per month, 3 minutes average, Creator plan ($22/month), voice generation at 600 characters per call (120,000 total, within the 100,000 included tier, so $0 overage), conversational AI at an assumed $0.10/min (not published, replace with vendor quote), Twilio inbound at $0.0085/min. Total: $22 (platform) + $60 (conversational AI: 600 min × $0.10) + $5.10 (telephony: 600 min × $0.0085) = $87.10. Replace all assumptions with your actual vendor quotes and call volumes.
For Synthflow, the all-in per-minute rate is bundled. Same illustrative assumptions: 200 calls, 3 minutes average (600 minutes total), Professional plan ($99/month, 500 included minutes). Overage: 100 minutes × $0.20 = $20. Total: $99 + $20 = $119. Adjust for your actual call volume and plan tier.
What users say
ElevenLabs user feedback
Public review coverage for ElevenLabs was limited at the time of writing. Developer-focused voice platforms often have thin G2 coverage.
Available feedback highlights voice quality and API flexibility as strengths, with some users noting the complexity of calculating all-in costs when combining voice generation, conversational AI, and third-party telephony.
Synthflow user feedback
Public review volume for Synthflow is limited; the recurring themes below are drawn from the available G2 / Trustpilot / TrustRadius coverage. Users reportedly cite the no-code builder as a key advantage for non-technical teams.
Some reviewers note limited documentation for advanced use cases and unclear pricing details on the public website.
Strengths and gaps
What ElevenLabs does well
Voice quality and cloning. 32+ voices and custom cloning reportedly deliver natural-sounding speech; users building customer-facing products cite this as a differentiator.
API control. Developers can configure latency, interruption handling, and model selection at a granular level.
Model flexibility. Bring-your-own LLM support allows teams to use proprietary models or fine-tuned versions.
Enterprise compliance. SOC 2 Type II and GDPR certifications are published and accessible to procurement teams.
Where ElevenLabs has gaps
Pricing complexity. Separate billing for platform access, voice generation, conversational AI, and telephony makes cost estimation difficult for buyers without technical finance support.
Telephony dependency. Users must integrate and manage third-party carriers (Twilio, Vonage), adding setup time and vendor coordination.
No built-in campaign tools. Outbound calling requires external orchestration; teams running high-volume campaigns need additional tooling.
What Synthflow does well
No-code builder. Visual flow creation allows operations teams to deploy agents without developer resources.
Bundled telephony. Phone numbers and carrier costs are included in per-minute pricing, which simplifies procurement.
Campaign scheduler. Built-in outbound list management and scheduling reduce the need for external tools.
Native integrations. Pre-built connectors to Calendly, HubSpot, and Salesforce speed up deployment for common use cases.
Where Synthflow has gaps
Limited model choice. Users cannot bring their own LLM or select alternative voice providers; customization is constrained to vendor-selected options.
Compliance documentation. SOC 2, HIPAA, and GDPR certifications are not publicly listed; procurement teams must request documentation directly.
Pricing opacity. No public pricing page; third-party estimates suggest per-minute rates, but buyers must contact sales for accurate quotes.
Developer control. API access is limited compared to ElevenLabs; teams building custom voice products may find the platform restrictive.
Which use cases fit each
| Use case | Stronger fit | Why |
|---|---|---|
| Inbound lead qualification | Synthflow | No-code builder and bundled telephony reduce setup time for operations teams |
| Appointment booking | Synthflow | Native calendar integrations and visual flow builder simplify scheduling workflows |
| After-hours reception | Either | Both support inbound call handling; choice depends on build preference (no-code vs API) |
| Outbound reminders | Synthflow | Built-in campaign scheduler and list management suit high-volume reminder workflows |
| Outbound sales calling | Either | Synthflow offers campaign tools; ElevenLabs offers voice quality and customization for scripted calls |
| Customer support deflection | ElevenLabs | API control and model flexibility allow teams to build complex support flows with custom logic |
| Contact centre overflow | ElevenLabs | Enterprise compliance and bring-your-own telephony fit large-scale contact centre infrastructure |
| Developer building voice product | ElevenLabs | API-first architecture and voice cloning support custom product development |
Pick ElevenLabs if you...
- Need API-first control over voice, latency, and model selection for a custom product.
- Require SOC 2 Type II or GDPR compliance documentation for enterprise procurement.
- Want to bring your own LLM or use advanced voice cloning for brand-specific audio.
- Have developer resources to integrate third-party telephony and orchestrate outbound campaigns.
Pick Synthflow if you...
- Need a no-code builder to deploy agents without writing code or hiring developers.
- Want bundled telephony and transparent per-minute pricing without managing separate carriers.
- Run high-volume outbound campaigns (reminders, confirmations) and need built-in scheduling.
- Prioritize speed to deployment over API flexibility and model customization.
Note: if the calls you're automating are inbound sales conversations that need to sit alongside an outbound AI SDR in one platform, teams in that position typically also evaluate 11x's Julian.
Verdict
ElevenLabs is the stronger fit for developers and enterprises building custom voice products. API control, voice cloning, and bring-your-own LLM support give technical teams the flexibility to optimize latency, brand voice, and conversational logic. Published SOC 2 Type II and GDPR certifications make procurement straightforward for compliance-sensitive buyers.
The trade-off is pricing complexity: separating platform fees, voice generation, conversational AI, and telephony requires finance coordination and vendor-specific quotes to calculate all-in costs.
Synthflow is the better starting point for operations teams automating appointment booking, lead qualification, or reminder calls without developer resources. The no-code builder and bundled telephony reduce setup time and vendor coordination. Built-in campaign scheduling suits high-volume outbound workflows.
The gaps are model flexibility and compliance transparency: teams that need custom LLMs, advanced voice cloning, or published certifications will find Synthflow restrictive.
Practical next steps: build the same short test flow (e.g., inbound appointment booking with calendar integration) on both platforms. For ElevenLabs, request a vendor quote for conversational AI per-minute rates and calculate all-in costs including Twilio or Vonage telephony. For Synthflow, request pricing documentation and confirm compliance certifications if required. Test call quality, interruption handling, and transfer logic with real scenarios before committing to a contract.
FAQ
Is Synthflow cheaper than ElevenLabs?
Synthflow's bundled per-minute pricing (estimated $0.17–$0.29/min depending on tier) is simpler to calculate than ElevenLabs' separate charges for platform access, voice generation, and telephony. For low-volume use cases (under 500 minutes per month), ElevenLabs' lower platform fees may result in lower total costs. For high-volume campaigns, Synthflow's bundled model may reduce vendor coordination overhead. Request vendor quotes for your specific call volume to compare accurately.
Which is easier to build with if I can't code?
Synthflow is easier for non-technical users. The visual flow builder allows operations teams to create agents by dragging and dropping nodes for call routing, calendar booking, and CRM updates. ElevenLabs requires API integration or low-code configuration, which typically needs developer support for setup and customization.
Can I bring my own phone numbers or carrier to each?
ElevenLabs requires bring-your-own telephony through third-party providers like Twilio or Vonage. Users integrate their existing carrier and phone numbers via API. Synthflow bundles phone numbers and carrier costs in per-minute pricing; bring-your-own carrier is not documented as a supported option. Teams with existing telephony infrastructure should confirm carrier flexibility with each vendor before committing.
Which handles outbound calling campaigns better?
Synthflow includes built-in campaign scheduling and list management, which suits teams running high-volume outbound reminders, confirmations, or follow-ups. ElevenLabs requires external orchestration (e.g., custom scripts, workflow tools) to manage outbound campaigns. For teams with developer resources building custom campaign logic, ElevenLabs offers more control. For operations teams deploying pre-built workflows, Synthflow reduces setup time.
Are Synthflow and ElevenLabs HIPAA compliant?
ElevenLabs publishes SOC 2 Type II and GDPR compliance statements but does not list HIPAA certification on its public documentation. Synthflow does not publish compliance certifications on its website. Healthcare teams should request Business Associate Agreements (BAAs) and compliance documentation directly from each vendor. Compliance depends on how the platform is deployed, not just vendor certifications; consult legal counsel before processing protected health information.
Can either transfer a call to a human?
Both platforms support warm transfer to human agents. ElevenLabs allows custom transfer logic via API webhooks, which lets teams route calls based on intent, sentiment, or escalation triggers. Synthflow includes built-in transfer rules in the visual builder, allowing users to configure handoff conditions without coding. Test transfer latency and reliability with real scenarios before deploying in production.
What do users complain about most?
For ElevenLabs, available feedback notes pricing complexity and the need to coordinate multiple vendors (platform, telephony, storage) as friction points. For Synthflow, reviewers cite limited documentation for advanced use cases and unclear public pricing as recurring concerns. Both platforms have thin public review coverage compared to established contact centre or sales engagement tools.
How does 11x's Julian compare to Synthflow and ElevenLabs?
Julian is 11x's AI phone agent for inbound speed-to-lead and qualification, sold as part of the 11x platform alongside Alice (outbound AI SDR). It's a packaged sales agent rather than a general-purpose voice-building platform. Teams building custom voice products for customer support, appointment booking, or non-sales use cases typically compare Synthflow and ElevenLabs more directly. Julian fits revenue teams that need inbound voice automation integrated with outbound prospecting in one system.
Which platform has better voice quality?
ElevenLabs reportedly offers 32+ voices and custom cloning, which users building customer-facing products cite as a differentiator. Synthflow uses vendor-selected voices with limited cloning options. Teams that need brand-specific audio or high-fidelity voice synthesis typically prefer ElevenLabs. Test both platforms with your actual scripts and use cases to compare voice quality directly.
Can I use my own LLM with either platform?
ElevenLabs supports bring-your-own LLM, which allows teams to use proprietary models or fine-tuned versions. Synthflow uses vendor-selected models; bring-your-own LLM is not documented as a supported option. Teams that need custom language models or fine-tuned conversational logic should confirm LLM flexibility with each vendor before committing.
