Lightning TTS v3

Text to Speech for Audiobooks

100ms latency. Narration That Reads the Room, Not Just the Page.

The morning Maya found the letter, the city was still quiet.
She stood at the window, coffee going cold in her hand, reading the same three lines over and over. Her flight left in four hours. The address on the envelope was her mother's handwriting — her mother, who had been dead for six years.

Record with Ease No Studio Required.

On-demand generation

Turn any script into broadcast-ready audio instantly. No takes, no retakes, no editing.

Reach New Audiences

One manuscript, 15 editions, zero re-recording.

Instant cloning in seconds

Clone any voice in under 10 seconds. No professional equipment required

Production speed

Generate a full-length audiobook in a fraction of the time it takes to record.

Built for every audiobook format.

One model. Every publishing context.

Emotional range

Expressive narration that shifts register across joy, grief, suspense, and calm

Character differentiation

Multiple distinct voice profiles from a single model

Multilingual narration

One manuscript. 15 language editions. Generated from a single narrator voice.

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

Richard
Original Voice

Cloned sample of Richard
Audiobook Narrator

Common questions about Lightning TTS

Will the narration sound natural across a full-length book?

Yes. Lightning V3.1 maintains consistent voice, tone, and expressiveness across hours of content-no drift, no variation between sessions.

Can Lightning differentiate between multiple characters?

Yes. Lightning supports multiple distinct voice profiles from a single model -giving each character their own voice without switching models or hiring additional actors.

Can I use my own voice or a specific narrator's voice?

Yes. Upload 15 seconds of audio and get a production-ready clone instantly. Works for author narration, signature narrator voices, or any custom voice.

Which languages are supported for audiobook narration?

Lightning supports 15 languages including English, Spanish, Hindi, French, German, Italian, Portuguese, Tamil, and more. Your cloned narrator voice works natively across all supported languages.

How much does it cost?

You get $10 in free credits when you sign up. After that it's pay-as-you-go. For publishers generating at scale, custom enterprise plans are available.

Can I integrate Lightning into my publishing platform or workflow?

Yes. Lightning is accessible via a simple REST API with Python and Node SDKs. No complex WebSocket integrations required.

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

The last TTS model you'll need

Instant access

$10 free credits

SOC 2 Compliant