Audio Intelligence

Audio in.
Any language out.

Transcribe, translate, and synthesize speech — all in a single tool. Built for people who work with audio every day.

Start for free See pricing

$19/month · 40 hours included · Cancel any time

Three ways to work with audio

Whether you're listening, speaking, or translating — Stellato handles the whole pipeline.

STT

Speech to Text

Upload any audio or video file and get a clean, accurate transcript. Supports 90+ languages via Groq's Whisper engine.

MP3, MP4, WAV, M4A, WEBM
90+ languages
Client-side compression before upload

TTS

Text to Speech

Paste any text and generate natural-sounding audio. Ideal for voiceovers, accessibility, and content in multiple languages.

Natural-sounding voices
Multiple language outputs
Downloadable MP3

Coming soon

STS

Speech to Speech

The complete pipeline in one pass — upload audio in any language, receive synthesized speech in another. Transcribe + translate + re-synthesize, automatically.

Full pipeline in one request
AI-powered translation included
Consistent voice + tone output

How speech-to-speech works

Three AI models. One pipeline. No stitching required.

Step 1

Upload Audio

Drop in any audio or video file. Your browser compresses it before it ever leaves your device.

Step 2

Transcribe + Translate

Groq's Whisper API converts speech to text. OpenAI translates to your target language.

Step 3

Synthesize Audio

Inworld AI synthesizes natural-sounding speech in the target language. Download and done.

Built for serious audio workflows

Most users stay under 15 hours a month. Power users get 40 — and instant top-ups when they need more.

90+

Languages supported

AI models in the pipeline

$19

Flat monthly price

Audio in. Any language out.