Runifier

Cadence-synced Apple Music, a high-precision metronome, and voice-coached pace updates — built for runners who train by tempo.

Runifier locks your music to your running rhythm. Set a target cadence, tap Start, and every Apple Music track speeds up or slows down so its beat lands on each step. A high-precision metronome clicks in sync, and a voice coach calls your pace out loud as you go.

KEY FEATURES

• Cadence-synced Apple Music — pick a target BPM (120–200) and Runifier time-stretches each track to match your stride.

• Per-song BPM memory — enter a song's BPM once and it's saved per track, applied automatically the next time it plays.

• Sample-accurate metronome — generated live by AVAudioEngine; never drifts, toggle the click on or off mid-run.

• Pace from Garmin or GPS — listens for Garmin Connect broadcasts during your run and falls back to iPhone GPS + pedometer cadence within five seconds if no watch signal is present.

• Voice pace coach — speaks current and average pace every 500 m, 1 km, 2 km, or 5 km, with automatic audio ducking so the music and metronome step out of the way during each callout.

• Live dashboard — large current pace and target BPM displays, connection status badge (Garmin / iPhone GPS), distance, average pace, and steps per minute.

HOW IT WORKS

1. Choose a target cadence on the dashboard. 175 BPM is a sensible starting point.
2. Queue a playlist or song from your Apple Music library.
3. Tap Start Workout. Music plays at the adjusted tempo, the metronome clicks at your target, and pace tracking begins.
4. The voice coach announces pace at the interval you've set.
5. Drag the BPM slider any time — the music and metronome retune instantly.

WHO IT'S FOR

Cadence-aware runners. Form-focused trainers. Marathoners who train by rhythm. Garmin watch users who want their phone library to keep pace with their wrist. Anyone tired of building "exactly 175 BPM" playlists by hand.

APPLE MUSIC

An Apple Music subscription is required for playback. Tempo adjustment works most reliably on tracks downloaded to your library; streaming-only catalog tracks may not honour playback rate changes. You can enter a Song BPM manually for any track and Runifier remembers it.

PRIVACY

Runifier doesn't send your location, pace, music library, or BPM entries off your device. All BPM data is stored locally. No analytics, no ads, no third-party trackers.