The Fastest Text to Speech.
Built for What's Next.

Generate natural-sounding speech with 16 languages, instant voice cloning, and real-time streaming at scale.

Start Building

Contact Sales

Start Building

Contact Sales

Conversational

Customer Support

Assistant

Storytelling

Okay so, Zurich,hear me out. I know it's not the first place people think of for winter, but I think that's actually kind of the point? Like the lake is just - it's just sitting there with snow on the Alps in the background and you're just-you're standing there with a coffee going, ah, how is this real?
English
Daniel
Okay so, Zurich,hear me out. I know it's not the first place people think of for winter, but I think that's actually kind of the point? Like the lake is just - it's just sitting there with snow on the Alps in the background and you're just-you're standing there with a coffee going, ah, how is this real?
English
Daniel

Conversational

Customer Support

Assistant

Voice over

The fastest text to speech teams trust at scale.

Real-time at scale

Sustain 20+ concurrent streams without sacrificing latency or audio quality.

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

Ultra-low latency output

100ms response times so your product never skips a beat- live, in production, at scale.

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.

Get your API key

Book a demo

1
from smallest import TTS
2
 
3
tts = TTS(api_key="your_key")
4
audio = tts.synthesize(
5
text="Hello, this is Lightning.",
6
voice="magnus",
7
sample_rate=44100
8
)
9
audio.save("output.wav") # That's it.

One model.

Every voice use case.

From real-time agents to long-form narration -

Lightning adapts to every context.

Try it out

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.

Try it out

View Docs

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.

Check out Security Docs

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.

Check out Security Docs

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.

Check out Security Docs

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?

Lightning TTS delivers responses in under 100ms -significantly faster than ElevenLabs and Google TTS. It also outperforms GPT-4o mini TTS in listener preference tests, with instant voice cloning unavailable on competitor entry plans.

Is Lightning TTS HIPAA compliant?

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

What makes this the fastest text to speech API?

Lightning is purpose-built for low-latency production workloads. It sustains 20+ concurrent real-time streams at sub-100ms latency with no quality trade-off.

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

Start building

Book a demo