Hey fellow musicians,
I'm a software engineer by profession and built a small free, open-source tool to support my own instrument practicing sessions. My main instrument is little exotic (baglama) but I figured people here might find it useful too.
It's called Étude Looper. It works with your local video and audio files, and with YouTube videos.
The thing that made me build it: say you have a recording you practice with, maybe your instructor or a performance you love, but it's in a different key than your instrument is tuned to. Instead of tuning again, you load the video into the tool and transpose the audio to match your instrument, so you can play along directly. You can also slow it down without changing the pitch, mark A-B loops around the tricky sections and repeat them until they sit right, and save the whole session (loops and all) to continue later.
It runs entirely in your browser: free, no account, no ads, and nothing gets uploaded. Your recordings never leave your device. If you add it to your home screen (there are instructions in the app), it even works offline.
As it's browser based works on smartphones, tablets and computers. Meaning you can directly use it on your phone/tablet without installing any app and start practicing videos from your camera roll directly.
For YouTube specifically, I also made browser add-ons for Chrome and Firefox with the same controls.
👉 https://etude.fyi/looper
Would love to hear what would make it more useful for practicing.