One click changes the pitch, key, speed and volume of whatever’s playing — transpose a song to your range, slow a part down to learn it, or speed up a lecture. Processed on your device.
Capo splices a real audio engine into the page and gives you direct control — no downloads, no re-encoding, no waiting.
Transpose a whole performance up or down by twelve semitones, in single steps — capo a song to sing along, or drop it to match the instrument in your hands. No warble, no chipmunk.
| Range | −12 … +12 st |
| Step | 1 st · fine ±50 ¢ |
| In settings | up to ±48 st |
From a quarter-speed practice tempo up to triple-time, the pitch stays exactly where you put it. Learn a lick by ear, or get through a lecture in half the time.
| Range | 0.25× … 3× |
| Step | 0.05× |
| In settings | up to 8× |
Fig. 1 — the popup, mid-practice: +2 st · 0.92× · 185% · loop 0:41.8 → 1:45.6
Some videos are just mixed quiet. Push playback well past the browser’s 100% ceiling — up to 300% — without touching the page’s own player.
| Ceiling | 300% |
| Scope | per-tab |
| In settings | up to 600% |
Set an A–B loop on the tricky four bars and let them repeat while you work them out — hands free, as many passes as it takes.
| Marks | A → B |
| Precision | 0.1 s |
| Repeats | until you stop it |
Capo processes audio right inside the page. There’s no server in the loop, no account to create, and no record of what you play. The only thing it ever stores is your settings — locally.
Being able to change pitch and speed independently is such a basic need — and still I couldn’t find it anywhere. This is pretty much the best one right now. I’m surprised it isn’t popular.
Simple, useful, works exactly as expected. One of the few extensions I use every day.
I can finally match songs to my vocal range without distortion. Surprisingly accurate pitch control.
Exactly what I didn’t know I needed. Works on both Chrome and Firefox flawlessly.
Perfect for learning songs — it lets me slow down the music, loop tricky parts, and practice lyrics at my own pace.
This has quietly become one of the most useful extensions in my browser.
Simple, useful, works exactly as expected. One of the few extensions I use every day.
I can finally match songs to my vocal range without distortion. Surprisingly accurate pitch control.
Exactly what I didn’t know I needed. Works on both Chrome and Firefox flawlessly.
Perfect for learning songs — it lets me slow down the music, loop tricky parts, and practice lyrics at my own pace.
This has quietly become one of the most useful extensions in my browser.
Very handy for A–B repeat. I’m using it to memorize songs stanza by stanza.
Absolute gem of an extension. Lightweight, fast, and the pitch changes sound natural.
Part of my daily workflow now, and the developers keep improving it with new features and fixes. Highly recommended.
I’m a music lover, and this extension is amazing. It makes listening to and practicing music so much more enjoyable.
Very handy for A–B repeat. I’m using it to memorize songs stanza by stanza.
Absolute gem of an extension. Lightweight, fast, and the pitch changes sound natural.
Part of my daily workflow now, and the developers keep improving it with new features and fixes. Highly recommended.
I’m a music lover, and this extension is amazing. It makes listening to and practicing music so much more enjoyable.
Pro unlocks the workspace — a side panel that stays with your tab and turns any player on the web into a practice studio.
Fig. 2 — the workspace mid-session: −2 st · 85% · vocal 45% · loop 0:18.5 → 0:24.0
Your shift spelled as an interval — and how long the track runs at your tempo.
A precision dial with ±50 ¢ fine-tune, varispeed, and a preserve-voice toggle.
Reshape the voice, add a room — or duck the lead vocal and play with the band.
Carve space for your instrument with filters drawn over the live spectrum.
Practice notes saved with the track, right where you left them.
Markers, clips and the loop on one overview — plus a loupe for exact loop points.
Pin the intro, verse and solo — then jump, loop or clip any section in a tap.
Saved sections with their own speed, pitch and repeats — chain them into a routine.
Every subscription starts with a 7-day free trial — or pay once and keep Pro for good.
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Capo
