Meet Lightning TTS v3
Text to Speech
built for Voice Agents
100ms latency. 15 languages. Built for human conversation.
Start Building
Contact Sales
Conversational
Customer Support
Assistant
Storytelling
Conversational
Customer Support
Assistant
Voice over
The voice infrastructure
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
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.
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.
Media
Presenter-quality voice for intros, ads, and full episodes.
Localisation
Generates native-sounding speech across 15 languages
Accessibility
Generates clear speech optimised for screen readers and assistive tools.
Audio quality that
leads every benchmark.
Audio quality that
leads every benchmark.
Independent benchmarks put Lightning ahead
of every major model on the metrics that matter
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.
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
Common questions about Lightning TTS
How many languages does Lightning V3.1 support?
Lightning V3.1 supports 15 languages, with more being added regularly. Best in class languages include English, Spanish, Hindi and Tamil. We have a strong coverage across Europe with French, German, Italian, Portuguese, Swedish, and Dutch, along with Indic support with Hindi, Tamil, Telugu, Malayalam, Kannada, Marathi, and Gujarati. If your language isn't on the list yet, it likely will be soon.
How many languages does Lightning V3.1 support?
Lightning V3.1 supports 15 languages, with more being added regularly. Best in class languages include English, Spanish, Hindi and Tamil. We have a strong coverage across Europe with French, German, Italian, Portuguese, Swedish, and Dutch, along with Indic support with Hindi, Tamil, Telugu, Malayalam, Kannada, Marathi, and Gujarati. If your language isn't on the list yet, it likely will be soon.
How long does voice cloning take and how much audio do I need?
Under 15 seconds of audio is all it takes. The clone is ready instantly and built to deploy at any scale from day one.
How long does voice cloning take and how much audio do I need?
Under 15 seconds of audio is all it takes. The clone is ready instantly and built to deploy at any scale from day one.
What is the latency and can I use it for real-time applications?
Lightning V3.1 delivers under 100ms time-to-first-audio. It was built specifically for real-time applications, so low latency isn't a trade-off you make. It's the default.
What is the latency and can I use it for real-time applications?
Lightning V3.1 delivers under 100ms time-to-first-audio. It was built specifically for real-time applications, so low latency isn't a trade-off you make. It's the default.
How is usage billed and is there a free tier?
You get $10 in free credits when you sign up, no strings attached. After that it's pay-as-you-go, so you only pay for what you use. For teams that need massive scale or high concurrency, we offer custom enterprise plans. Reach out to sales and we'll build something that works for you.
How is usage billed and is there a free tier?
You get $10 in free credits when you sign up, no strings attached. After that it's pay-as-you-go, so you only pay for what you use. For teams that need massive scale or high concurrency, we offer custom enterprise plans. Reach out to sales and we'll build something that works for you.
What industries and use cases is Lightning built for?
Lightning powers voice agents, IVR systems, audiobook generation, podcast production, gaming dialogue, accessibility tools, and any application where the voice is the product. Our enterprise customers span fintech (payment IVR), healthcare (appointment reminders, clinical agents), insurance (claims processing), travel (booking and support), telecom (digital-first support), and AI voice agent platforms that use Lightning as their TTS layer.
What industries and use cases is Lightning built for?
Lightning powers voice agents, IVR systems, audiobook generation, podcast production, gaming dialogue, accessibility tools, and any application where the voice is the product. Our enterprise customers span fintech (payment IVR), healthcare (appointment reminders, clinical agents), insurance (claims processing), travel (booking and support), telecom (digital-first support), and AI voice agent platforms that use Lightning as their TTS layer.
What audio formats does the API output?
Lightning V3.1 supports PCM, MP3, WAV, and mulaw.
What audio formats does the API output?
Lightning V3.1 supports PCM, MP3, WAV, and mulaw.
Is my data stored or used to train your models?
No, your data is yours. We log interactions for operational purposes only and never use your data to train our models. What you build with Lightning stays between you and your users.
Is my data stored or used to train your models?
No, your data is yours. We log interactions for operational purposes only and never use your data to train our models. What you build with Lightning stays between you and your users.
Can I control emotion, pace, and expressiveness?
Lightning V3.1 voices are designed to be naturally expressive and adapt to the context of what's being said without you having to dial anything in. For teams that want more direct control, V3.2, our instructional model, is coming soon. Stay tuned.
Can I control emotion, pace, and expressiveness?
Lightning V3.1 voices are designed to be naturally expressive and adapt to the context of what's being said without you having to dial anything in. For teams that want more direct control, V3.2, our instructional model, is coming soon. Stay tuned.
What support and SLAs are available for enterprise customers?
Smallest.ai runs at 99.99% uptime for enterprise clients, is SOC 2 aligned, HIPAA compliant, GDPR compliant, and ISO aligned. For dedicated support, SLAs, and on-premise deployment options, reach out to our sales team and we'll set up the right plan for your needs.
What support and SLAs are available for enterprise customers?
Smallest.ai runs at 99.99% uptime for enterprise clients, is SOC 2 aligned, HIPAA compliant, GDPR compliant, and ISO aligned. For dedicated support, SLAs, and on-premise deployment options, reach out to our sales team and we'll set up the right plan for your needs.
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
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
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
Instant access
$10 free credits
$10 free credits
SOC 2 Compliant
SOC 2 Compliant