The Text to Speech API
Built for Production
Convert text to speech in under 200ms. with 16 languages, and instant voice cloning
Start Building
Contact Sales
Conversational
Customer Support
Assistant
Storytelling
Conversational
Customer Support
Assistant
Voice over
The voice api
teams trust at scale.
Production-ready audio quality
Broadcast-grade output for podcasts, audiobooks, and game characters
Multilingual and adaptive
15 languages. Automatic detection. Seamless code-mixing mid-sentence.
Instant cloning in seconds
Clone any voice in under 10 seconds. no professional equipment required
Real-time at scale
Maintain 20+ concurrent streams with 100ms latency
Your first voice agent in just 5 lines of code
Your first voice agent in just 5 lines of code
WebSocket · SSE · HTTP streaming or batch, your choice.
WebSocket · SSE · HTTP streaming or batch, your choice.
One model.
Every voice use case.
From real-time agents to long-form narration -
Lightning adapts to every context.
Voice Agents
Conversational AI that sounds like a real person not a script reader.
Gaming
Dynamic character voices with emotional range.
Gaming
Dynamic character voices with emotional range.
Audiobooks
Long-form narration with natural prosody and pacing.
Audiobooks
Long-form narration with natural prosody and pacing.
Create high-quality
voice clones for production use
Create high-quality
voice clones that sound real
Create high-qualityvoice
clones for production use
Upload a sample. Get a production-ready voice clone in under 10 seconds.
Upload a sample. Get a production-ready voice clone in under 10 seconds.
Cloned Voice
High-fidelity voice replication
Lauren
Original Voice
Cloned sample of Lauren
Audiobook Character
Name 1
Name 2
Lauren
Original Voice
Cloned sample of Lauren
Audiobook Character
Cloned Voice
High-fidelity voice replication
Your data, secure with Enterprise Security
Your data is secured by top SOC 2 Type 2, HIPAA, and PCI compliance standards, both in the cloud and on-premises.
We comply with HIPAA to protect your health information.
Smallest.ai has undergone SOC 2 Type II attestation and undergoes annual audits.
Strict internal audit processes for data management.
Infrastructure that meets ISO standards
Your data, secure with Enterprise Security
Your data is secured by top SOC 2 Type 2, HIPAA, and PCI compliance standards, both in the cloud and on-premises.
We comply with HIPAA to protect your health information.
Smallest.ai has undergone SOC 2 Type II attestation and undergoes annual audits.
Strict internal audit processes for data management.
Infrastructure that meets ISO standards
Your data, secure with Enterprise Security
Your data is secured by top SOC 2 Type 2, HIPAA, and PCI compliance standards, both in the cloud and on-premises.
We comply with HIPAA to protect your health information.
Smallest.ai has undergone SOC 2 Type II attestation and undergoes annual audits.
Strict internal audit processes for data management.
Infrastructure that meets ISO standards
Common questions about TTS API
How does Lightning compare to ElevenLabs and Google TTS?
A: Lightning TTS is preferred by 76% of listeners over GPT-4o mini TTS in blind tests. It offers lower latency than ElevenLabs and higher audio quality than Google TTS, with instant voice cloning that neither competitor offers on entry plans.
Is Lightning TTS HIPAA compliant?
Yes. Lightning TTS is HIPAA, SOC 2 Type II, PCI DSS, and GDPR compliant.
What industries and use cases is Lightning built for?
Customer service, voice agents, audiobooks, gaming, accessibility tools, podcasts, e-learning, and any app that needs real-time AI text to speech at scale.
How quickly can I integrate the API?
Most developers generate their first audio in under 5 minutes. The API supports Python and JavaScript SDKs, plus direct cURL.
What languages are supported?
16 languages including English, Hindi, Spanish, French, German, Japanese, Korean, Portuguese, Arabic, and more.
How does voice cloning work?
Upload a short audio clip (as little as 10 seconds), and Lightning TTS replicates the voice characteristics instantly. No fine-tuning or long training jobs required.
Is there a text to speech free plan?
Yes. Lightning TTS offers a free tier so developers can build and test before committing. No credit card required to start.
Common questions about TTS API
How does Lightning compare to ElevenLabs and Google TTS?
A: Lightning TTS is preferred by 76% of listeners over GPT-4o mini TTS in blind tests. It offers lower latency than ElevenLabs and higher audio quality than Google TTS, with instant voice cloning that neither competitor offers on entry plans.
Is Lightning TTS HIPAA compliant?
Yes. Lightning TTS is HIPAA, SOC 2 Type II, PCI DSS, and GDPR compliant.
What industries and use cases is Lightning built for?
Customer service, voice agents, audiobooks, gaming, accessibility tools, podcasts, e-learning, and any app that needs real-time AI text to speech at scale.
How quickly can I integrate the API?
Most developers generate their first audio in under 5 minutes. The API supports Python and JavaScript SDKs, plus direct cURL.
What languages are supported?
16 languages including English, Hindi, Spanish, French, German, Japanese, Korean, Portuguese, Arabic, and more.
How does voice cloning work?
Upload a short audio clip (as little as 10 seconds), and Lightning TTS replicates the voice characteristics instantly. No fine-tuning or long training jobs required.
Is there a text to speech free plan?
Yes. Lightning TTS offers a free tier so developers can build and test before committing. No credit card required to start.
The last TTS
model you'll need
Instant access
Instant access
$10 free credits
$10 free credits
SOC 2 Compliant
SOC 2 Compliant