The Text to Speech API Built for Production

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

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

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

from smallest import TTS

tts = TTS(api_key="your_key")
audio = tts.synthesize(
    text="Hello, this is Lightning.",
    voice="magnus",
    sample_rate=44100
)
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.

Voice Agents

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

Gaming

Dynamic character voices with emotional range.

Audiobooks

Long-form narration with natural prosody and pacing.

Create high-quality

voice clones for production use

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

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.

The last TTS model you'll need

Instant access

$10 free credits

SOC 2 Compliant