OuteTTS vs Retell AI

Side-by-side comparison of features, pricing, and ratings

Analysis generated Live tool data as of 2026-11-08
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OuteTTS or Retell AI: which should you choose?

DimensionOuteTTSRetell AI
PricingFrom $10/10 creditsFree plan · paid plans on request
Best forDevelopers shipping voice agents or IVR who need cloning without a training run, Indie teams who prefer per-second credits over a recurring monthly subscriptionSupport teams handling high inbound volume with nuanced multi-turn conversations, Sales teams running outbound qualification, batch dialling and pacing campaigns
Standout featuresOne-shot voice cloning from a 5-10 second audio sample, no fine-tuning · Text-to-speech generation across 20+ languages · Streaming TTS endpoint for real-time playbackAI voice agents for inbound and outbound phone calls · Drag-and-drop call flow canvas with functions, transfers and DTMF · Proprietary turn-taking model at roughly 600ms latency
Viability score52/10089/100
APIYesYes

OuteTTS is the stronger pick for developers shipping voice agents or ivr who need cloning without a training run; Retell AI fits better for support teams handling high inbound volume with nuanced multi-turn conversations.

Built from live tool data, last verified 2026-11-08.

OuteTTS
OuteTTS

One-shot voice cloning TTS API with open weights on Hugging Face, billed per second generated.

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Retell AI
Retell AI

Retell AI builds AI voice agents that answer, route and QA real phone calls from $0.07/min.

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Pricing
Paid
Freemium
Plans
Pay-As-You-Go$10/10 credits
Pay as you goFree
EnterpriseCustom
Popularity
6 views
6.9k views
Skill Level
Intermediate
Intermediate
API Available
Platforms
WebAPI
WebAPI
Categories
🎙️ Voice & Speech
☎️ Voice AI Agents & Phone Automation
FeaturesOuteTTSRetell AI
One-shot voice cloning from a 5-10 second audio sample, no fine-tuning
Text-to-speech generation across 20+ languages
Streaming TTS endpoint for real-time playback
Batch generation endpoint for queued jobs
Official Python SDK with sync and async support
Studio no-code browser tool for prototyping and voice previews
Pay-as-you-go credits billed per second of audio, never expiring
Input audio discarded immediately after processing
Voice samples never stored or reused for model training
Session history permanently deletable
Account-scoped API tokens with revocation
Built-in and cloned voice library management
Open weights on Hugging Face: Llama-OuteTTS-1.0-1B updated Sep 8, 2025
GGUF, ONNX, FP8 and EXL2-8bpw builds for GPU, CPU or edge self-hosting
DAC-speech-v1.0-ONNX available for on-device speech decoding
AI voice agents for inbound and outbound phone calls
Drag-and-drop call flow canvas with functions, transfers and DTMF
Proprietary turn-taking model at roughly 600ms latency
Conversation Memory: per-contact brief carried across calls and SMS
Retell Workflows: native CRM and helpdesk automation inside each call
Conductor copilot: simulate scenarios and turn failed calls into regression tests
Conductor observability surfacing on every dashboard page
Batch outbound campaigns with pacing, retries and voicemail handling
IVR navigation that detects menus, presses digits and enters extensions
Agentic human handoff that briefs the rep before connecting
Live call monitoring, listen-in and instant take-over
AI Quality Assurance scoring on up to 100% of calls
Post-call analysis with sentiment scoring and CRM write-back
Model-agnostic LLM and voice selection across GPT, Claude and Gemini
Omnichannel delivery via voice, web and in-app chat, SMS and API
IntegrationsOuteTTSRetell AI
Twilio
Vonage
Telnyx
GoHighLevel
Make
n8n
Zapier
HubSpot
Slack
Google Drive

Frequently Asked Questions

Which is better, OuteTTS or Retell AI?

The best choice between OuteTTS and Retell AI depends on your specific use case — we compare them independently on features, current pricing, integrations, and real-world signals (with an on-demand sentiment scan available for each). See the side-by-side breakdown above to match them to your needs.

What are the main differences between OuteTTS and Retell AI?

The key differences include pricing model, feature set, platform support, and skill level requirements. Review the full comparison on RightAIChoice for a detailed breakdown.

Is there a free version of OuteTTS or Retell AI?

Check the pricing section in the comparison for the latest pricing details on both tools, including free tiers, trial options, and paid plans.

What else are OuteTTS and Retell AI compared with?

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Where can you read more about OuteTTS and Retell AI?

OuteTTS
View OuteTTS reviewOuteTTS alternatives
Retell AI
View Retell AI reviewRetell AI alternatives

Browse these categories

Best AI Voice & Speech toolsBest AI Voice AI Agents & Phone Automation tools
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Analysis generated by our model pipeline from live data: