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Lightning TTS v3.1

The Text to Speech API Built for Production

Convert text to speech in under 200ms. with 16 languages, and instant voice cloning

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Trusted by 100+ enterprises

Lightning TTS v3.1

English

Daniel

Generated by Lightning TTS v3.1 44.1 kHz · <100ms

Performance that speaks for itself

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Preferred over leading TTS

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kHz

Studio sample rate

Latency

0.0

Word accuracy

Studio Quality Audio

One Text to Speech API. Every Use Case.

Each card plays a short sample. Hear Lightning in the context that matters to you.

Voice Agents

Conversational AI that sounds like a real person not a script reader.

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Customer Service

Warm IVR greetings that build trust from the first second.

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Audiobooks

Long-form narration with natural prosody and pacing.

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Media

Presenter-quality voice for intros, ads, and full episodes.

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Content

Enhance customer service with AI-powered voice assistance

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Accessibility

Clear, calm screen reader voice at any speed.

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Your first voice agent in just 5 lines of code

WebSocket · SSE · HTTP streaming or batch, your choice.

Get your API key

Book a demo

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from smallest import TTS
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tts = TTS(api_key="your_key")
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audio = tts.synthesize(
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    text="Hello, this is Lightning.",
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    voice="magnus",
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    sample_rate=44100
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)
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audio.save("output.wav") # That's it.

What makes
Lightning v3.1 different

Built for teams that ship voice products

not teams that experiment with them.

Built for teams that ship voice products not teams that

experiment with them.

Broadcast-Quality Audio

44.1 kHz native sample rate. WVMOS score of 5.06 the highest in the Lightning family. sounds like it was recorded in a studio, not synthesized by a machine.

Real-Time, Every Time

<200ms latency at 20 concurrent requests. RTF of 0.3 audio generates 3.3× faster than playback speed. Built for live voice agents, not batch exports.

Voice Cloning

Clone any voice in 5–15 seconds for rapid deployment. Invest 45+ minutes of audio for professional-grade cloning that captures intonation, accent, & emotion.

16 Languages

English, Hindi, Spanish, Tamil, French, German, Arabic, Russian, Italian, Dutch, Polish, Hebrew, Bengali, Gujarati, Kannada, Marathi. Local accents built in, not bolted on.

Lightning v3.1 makes a leap in voice quality

Lightning v3.1 makes
a leap in voice quality

Same text. Two models. Press play on both

the gap is immediately audible.

Same text. Two models. Press play on both the gap is immediately audible.

PREVIOUS VERSION

Lightning v2

24 kHz · Previous generation

ALL NEW

Lightning v3.1

44.1 kHz · Broadcast quality

Common questions about Lightning TTS

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.

How does Lightning compare to ElevenLabs and Google TTS?

Is Lightning TTS HIPAA compliant?

Yes. Lightning TTS is HIPAA, SOC 2 Type II, PCI DSS, and GDPR compliant.

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.

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.

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.

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.

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.

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.

Smallest enhances customer experiences significantly.

Quickly launch voice agents and chat with our sales team to enhance your customer relationships.

Trusted by 100+ Companies

Contact Sales

Fill in the details below and we'll get back to you shortly

Smallest enhances customer experiences significantly.

Quickly launch voice agents and chat with our sales team to enhance your customer relationships.

Trusted by 100+ Companies

Contact Sales

Fill in the details below and we'll get back to you shortly

Smallest enhances customer experiences significantly.

Quickly launch voice agents and chat with our sales team to enhance your customer relationships.

Trusted by 100+ Companies

Contact Sales

Fill in the details below and we'll get back to you shortly

The Text to Speech API Built for Production

Performance that speaks for itself

Performance that speaks for itself

Studio Quality Audio

Your first voice agent in just 5 lines of code

Your first voice agent in just 5 lines of code

What makes Lightning v3.1 different

Lightning v3.1 makes a leap in voice quality

Lightning v3.1 makes a leap in voice quality

Lightning v2

Lightning v2

Lightning v3.1

Lightning v3.1

Common questions about Lightning TTS

Smallest enhances customer experiences significantly.

Contact Sales

Smallest enhances customer experiences significantly.

Contact Sales

Smallest enhances customer experiences significantly.

Contact Sales

What makes
Lightning v3.1 different

Lightning v3.1 makes
a leap in voice quality