How to Slow Down Music on iPhone & Android
You don't need an app. loope runs in mobile Safari and Chrome — load a song, drag the speed slider, practice on the couch.
Why a Browser Works on Mobile Now
Modern mobile browsers (Safari iOS 14+, Chrome Android recent) support WebAssembly, the Web Audio API, and File System Access — all the pieces loope needs. That means a full audio practice tool runs in a tab without an app store install, without permissions, without signup. The tradeoff: you can't record live audio as easily as a native app, and very long sessions can hit memory limits on older phones. For practice purposes (loading one song, slowing it, looping it), neither is a real problem.
Step 1: Open loope in Your Mobile Browser
Navigate to loope.studio in Safari (iOS) or Chrome (Android). Add it to your home screen if you use it often — iOS lets you 'Add to Home Screen' from the share menu, Chrome from the main menu. This gives you an app-like icon that launches loope directly. loope is a PWA, so it caches assets after first load. On subsequent visits, it works even if your connection is spotty.
Step 2: Load an Audio File
Tap the upload area. Your phone's file picker opens. On iOS, you can pick from Files (which includes iCloud Drive, Dropbox, Google Drive), the Music app (for non-DRM files you own), or Voice Memos. On Android, you get Files, Google Drive, and whatever other file providers you have installed. You can't directly import from Apple Music or Spotify (those are DRM-protected streams, not files you own). For songs you want to practice with, use files you've legally acquired — purchased downloads, exports from YouTube-to-MP3 for public domain material, your own recordings.
Open loope on your phoneStep 3: Use Sliders with Your Thumbs
loope's sliders are touch-friendly — big enough to grab accurately on a phone. The Speed slider works the same as on desktop: slide left to slow down, right to speed up. Pitch and Fine Tune work the same way. The Play button is thumb-sized. The waveform responds to taps for setting A/B loop points. It all behaves like you'd expect on a native app.
Step 4: Practice Comfortably
Set your speed, set your loop, lean back, and play along. A phone is a totally valid practice surface — especially for informal practice, couch jamming, or when you don't want to boot up a laptop. If you need the audio to keep playing while you switch tabs or lock the screen, use the 'Export' feature to save the processed version and play it back in your phone's normal music app, which handles background audio better than a web page.
Try it now in Loope
Drop a track. Slow it down. Loop the tricky part. Change the key. All in your browser — no upload, no signup.
Open LoopeFrequently Asked Questions
Mostly yes. Anything running iOS 14+ or Android 8+ with an updated browser should work. Older devices may hit memory limits on long files. Very old browsers (pre-2020) without WASM support won't work at all.
On desktop, the browser keeps the page alive. On mobile, if the browser puts the tab to sleep, your position may reset. For longer practice sessions on mobile, export the slowed-down version and play it in your regular music app.
About the same as any audio app. The WASM audio processing is efficient; browser overhead is the main battery cost. Expect 1–2 hours of continuous practice on a typical phone before noticeable battery impact.
Yes. The browser plays audio through whatever output device the OS has selected — Bluetooth speakers, AirPods, wired headphones all work. Audio latency may be slightly higher over Bluetooth, which isn't noticeable for practice playback.
No, and probably not in the near term. The browser version does everything a native app would, and 'add to home screen' gives it an app-like launcher. Skipping the app store keeps development simple and updates instant.