rat.audio is a free text-to-speech studio made by Virat Kaukuntla. Paste a script, choose a voice profile, and it reads the script aloud with Kokoro-82M, an open 82-million-parameter voice model that runs right in your browser on WebGPU. There is no server and no API key, and your script never leaves your device. It is 100% free, forever: the first generation needs no account, and after that a free Google sign-in keeps it unlimited. Audio starts playing after the first sentence, and the full track downloads as a WAV file. It is in public beta.

What it does

Five studio voices, including Deep Male Narrator and Rocco Spinelli, a swaggering cowboy
A Voice Lab to mix up to three of Kokoro's 28 voices, tune pitch and pace, save them and share them by link
Record your voice (beta): it measures your pitch, tone and pace on your device and builds the closest matching voice
A free connector (MCP) so ChatGPT and Claude can narrate scripts and design voices for you
Runs on WebGPU with a WebAssembly fallback, at roughly an eighth of a second per word on a recent Mac
Streams each finished sentence to the browser so playback starts before the whole script is done
Joins segments with natural pauses for sentences and paragraphs, and exports a 24 kHz WAV
Live pipeline console, waveform view, word counter and adjustable pace