Audio Looper & Speed Changer

Verena Zaiser

In-app purchases

About this app

Audio Looper & Speed Changer. Loop it. Slow it down. Nail it.

RepeatLab is the audio looper and speed changer built for musicians. Import your own audio and video files, loop any section of a song, slow down music without changing the pitch, and master difficult riffs, solos and passages one bar at a time.

No ads · No account · 100% offline

PRECISE A-B LOOPING
- Tap to mark the start and end of any tricky section and loop it instantly
- Fine-tune loop points to the millisecond on the interactive waveform
- Multiple named, colour-coded loops per song (Pro), shown on a visual timeline
- Jump between loops from the lock screen, notification or Bluetooth controls

SLOW DOWN MUSIC WITHOUT CHANGING PITCH (Pro)
- Slow songs down to 0.5x or speed up to 2.0x in fine 0.1 steps
- Tempo changes, pitch stays true — no chipmunk effect
- Simple speed multiplier or exact BPM mode (up to 400 BPM)
- Tap Tempo: detect a song's BPM by tapping along

CHANGE THE KEY, NOT THE SPEED (Pro)
- Transpose any song up or down by up to 12 semitones
- Match your instrument's tuning or practise in a comfortable key
- Saved per song and combines freely with speed control

METRONOME THAT FOLLOWS YOUR SONG
- Click at the song's tempo, following every speed change (free)
- Sync the click to the actual beat by tapping along (Pro)
- Time signatures 2/4, 3/4, 4/4, 5/4, 6/8, 7/8 and 12/8 with accent (Pro)
- Subdivisions in quarters, eighths, triplets and sixteenths (Pro)
- Millisecond nudge and independent click volume (Pro)

VIDEO LOOPING
- Import video tutorials or live performances and loop them like audio
- Slow videos down and play along, section by section
- Supports MP4, MOV, M4V, MKV, WEBM and AVI

WAVEFORM WITH ZOOM
- See every beat: played vs. unplayed audio and all loop markers
- Drag to scrub precisely, zoom 0.25x to 5x (Pro) to hit the exact note

EXPORT AND TRIM
- Save any loop as MP3 or lossless WAV — free
- Trim audio, cut songs down to the part you need, share the excerpt

BUILT FOR PRACTICE
- Unlimited songs — always free, batch import included
- MP3, WAV, OGG, FLAC, M4A and AAC support with editable tags
- Full background playback with lock-screen and headphone controls
- Back up your whole library to a single local file (Pro)

PRIVATE AND OFFLINE
- An offline music player by design — your files never leave your device
- No account, no registration, no ads
- Analytics strictly opt-in, GDPR compliant

IN YOUR LANGUAGE
Fully localised in 16 languages, with an in-app language switcher.

PERFECT FOR
Guitarists, bassists, drummers, pianists, singers, DJs and music students — transcribe solos, learn songs by ear, practise with a slowed-down backing track or drill that one bar until it sits.

FREE AND PRO
Free forever: unlimited songs, one loop per song, WAV export, background playback, metronome, tap tempo, no ads.
Pro: unlimited loops, speed and BPM control, pitch and key control, metronome sync with time signatures and subdivisions, waveform zoom and library backup.

Note: RepeatLab plays your own audio and video files from your device. Music from streaming services cannot be used for technical reasons.

Built with its users: vote for features directly in the app. Download RepeatLab and practise smarter.

Ratings and reviews

Look, good app, a bit buggy though. one of the bugs was that after cutting out a loop, if you scroll around the music hand, the app shows that nothing changed but the music shifts, either forwards or backwards. don't know if it only for free or paid versions as well. I'll install it again if the bug is fixed. Let me know.

Paid version might be cool, but it's hard to say. The free version disables zoom and speed change - both of which I need in order to learn parts.

Requires premium to loop more than once. Confusing hard to follow UI.

What’s new

• Change pitch without changing speed — pick a target key from a grid, or fine tune in cents
• Play along to a built-in metronome that syncs to your song
• Import several audio or video files at once
• Move loop start and end freely while paused; smoother loop playback
• Choose what goes into a backup: audio, video, loops and settings
• Bug fixes, improved stability and performance