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.

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

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

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?
    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.

The last TTS model you'll need

Instant access

$10 free credits

SOC 2 Compliant