Natural and expressive speech synthesis

API

Empowering Voices, Simplifying AI Integration

API Console
Bring your service and content to life with Supertone API.
API Console
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Trusted by industry leaders

Why Supertone API?

Realistic and controllable speech synthesis

Supertone API doesn't just read sentences — it understands context and delivers emotion.

01

Emotionally rich speech

With our proven natural language-based speech synthesis, dozens of native speakers praised it as “more human than a real human.”
Experience voices that express a wide range of emotions and intonations with over 50 available styles.
02

Fully adjustable voice

Pitch, intonation, even speaking speed—the same sentence can sound completely different depending on the context. Create the perfect voice for ads, games, video narration, and more.
03

One voice, multilingual delivery

Supports Korean, English, and Japanese. You can synthesize speech in multiple languages while maintaining the character’s identity. It’s built for scalability in global content and multilingual services.

Endless possibilities of AI voices

Discover versatile use cases powered by Supertone API’s diverse voices.

AI Character Chatbot

Create immersive, interactive characters using AI voices that understand emotions and respond in real time.

Miya

“Wanna talk with me?”

Audiobook Production

Enhance the quality of audiobooks and educational content with a soothing voice that stays pleasant even over long listening sessions.

Jiho

“That night, something strange happened in the village.”

Announcements & AI Newsreader

Deliver public info, corporate content, or news clearly and reliably with a crisp, trustworthy AI voice.

Hannah

“We will now begin the announcement.”

Multilingual Content Dubbing

Express Korean, English, and Japanese naturally with a single voice — for more efficient and consistent global content production.

Andy

“Hello. 안녕하세요. こんにちは.”

Supertone Voice AI — now available via API

Text-to-speech is just the beginning. More features are coming to the API.

Voice Cloning

Upload a voice sample of around 10 seconds and replicate it as an AI voice. You can now instantly call your cloned voice — registered via Supertone Play — directly through the API.
※ Voice cloning is currently available only via Supertone Play. The API supports playback of previously registered voices only.
Preview in
Play

Voice Conversion

Instantly transform a voice into a different tone or style. Perfect for games, animation, and content dubbing across various genres.
Preview in
Shift

Voice Separation

Separate the speaker’s voice, background sounds, and sound effects from a single audio source. Ideal for post-production and content editing workflows.
Preview in
Clear

Get Started with Supertone API

Quickstart with docs
Want to integrate without consultation? Start quickly with our console and guide.
Quickstart Guide
Need more support?
For advanced needs like custom voices or SLA discussions, contact our team to find the best integration path.
Contact Us

Pricing

Effective from April 17, 2025.
Effective from April 17, 2025.

View Open Promotion Benefits

Read

Grand Opening Unlimited Promotion – Until April 16, 2025!
Exclusive Benefits
Get 2 weeks of free trial, then standard fees apply.
• Unlimited voice cloning
• Unlimited usage
• Full access to over 150 premium voices
← Swipe to compare plans →
Free
Get started right now!
$0
Get Started
~5 min/mo
Maximum monthly usage
Supertonic ~5 min
Sona ~5 min
   
3,000 Credits · no card required
  • Full Voice Access
  • Unlimited Voice Cloning
    (Script Reading Required)
  • Unlimited Downloads
  • Commercial Use with 'Supertone' Attribution
  • Up to 20 API requests / min.
Starter
Create 1 short-form video every day!
$2.99 /mo
Subscribe
~30 min/mo
Maximum monthly usage
Supertonic ~30 min
Sona ~30 min
   
20,000 Credits · resets monthly
  • Everything in Free, plus
  • Voice Cloning via Audio File Upload
  • Unlimited Desktop
    (Supertonic, first month)
  • Unlimited Commercial Use
Creator Recommended
Loved by short & long-form creators!
$14.99 /mo
Subscribe
~300 min/mo
Maximum monthly usage
Supertonic ~300 min
Sona ~150 min
   
100,000 Credits · resets monthly
  • Everything in Starter, plus
  • AI Dubbing
  • Word & Line Spacing Control
  • Up to 30 API requests / min.
Pro
Recommended for professional creators!
$79.99 /mo
Subscribe
Unlimited
Maximum monthly usage
Supertonic /Desktop Unlimited
Supertonic /Web ~1600 min
Sona ~800 min
500,000 Credits · resets monthly
  • Everything in Creator, plus
  • Unlimited Desktop forever
    (Supertonic, Supertonic 3)
  • Up to 60 API requests / min.

Enterprise

Custom solutions for large-scale businesses. Volume-based pricing, dedicated support, and flexible API limits tailored to your needs.

  • Custom credits & pricing
  • Flexible API rate limits
  • Dedicated account manager
  • Priority support
Contact Sales

Frequently Asked Questions

Credits are reset every month and do not roll over to the next month. New credits are issued for your plan at the start of each billing cycle.
When your credits are used up, voice generation is temporarily paused. There are no automatic overage charges, and you can resume use once your credits are refilled in the next billing cycle. You can also upgrade your plan to receive additional credits immediately.
Supertonic is Supertone's lightweight, high-efficiency model — with the same credits, it can generate about 2× the audio compared to Sona. Sona delivers the highest-quality expressiveness but consumes 2× the credits of Supertonic. Choose the one that fits your needs.
When using the Supertonic model in the Desktop app, you can generate audio without consuming credits. This applies to the first month only for Starter and Creator, while Pro subscribers can enjoy it throughout their entire subscription period. Sona 2 still consumes credits in the Desktop app.

Customer Support

Check out the Quickstart guide to get started right away.
Quickstart Guide
If you have any questions, feel free to contact our support team.
Customer Support
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Company  Supertone Inc.
CEO  Hoon Heo
Business Address  #101, 19th Floor, 427, Teheran-ro, Gangnam-gu, Seoul, Republic of Korea
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