Try the format
Open the file.
Find the words.
Listen to the example below, or open a recording of your own. Words highlight as they play. Click any word to jump to that moment, including words in an overlapping reply.
Bring your own recording
Drop an .opus or .ogg file here. Local files stay in your browser.
Example meeting
Saturday repair café: the rain plan
Reading Saturday repair café: the rain plan…
File details Reading…
A fictional planning call voiced with ElevenLabs v3, with a separate audio track for each speaker. Cassini processed those tracks into the recording and word-timed transcript above. Four brief replies overlap the main speaker. Download source tracks (.mkv) ↓ How it was made →
The same format, set to music
A song can carry its lyrics, too.
Try the karaoke view of Tom Lehrer’s Element Song, with words highlighted as it plays.
Open the karaoke demo →Make it your own
Build a reader like this one.
The standalone browser reader is CC0 and uses standard web APIs with no runtime dependencies. The transcript interface shown here is Cassini’s own component, licensed under AGPL-3.0.
Read a file in code →