Dynamic & Gap Metronome for iOS and Android
The metronome that speeds up with you.
Accel Metronome is a free dynamic and gap-trainer metronome for iOS and Android: it raises the tempo automatically every few bars and mutes whole bars to test your internal clock.
Set a start tempo, a bar count and a step. Accel Metronome climbs to your target on its own, then brings you back down. Add a gap trainer that goes silent for whole bars, and you have a practice partner instead of a click.
On your phone
Three screens. No menus in the way.
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The metronome
Tempo dial, tap tempo, subdivisions and accents. Everything within a thumb.
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Dynamic mode
Start, step, target. Watch the tempo climb bar by bar.
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Gap trainer
Silent bars on the grid. The click comes back exactly on time.
In 30 seconds
See the tempo climb.
The video shows dynamic mode raising the tempo step by step, the gap trainer muting whole bars, and an overview of the other features. It starts muted; turn the sound on in the player controls to hear the click.
Dynamic mode
Increase by 5 BPM every 4 bars.
That is the whole setup. Accel holds each tempo for the bars or minutes you choose, steps up on the bar line, and lands exactly on your target even when the maths does not divide evenly.
Turn on Ramp back down and it returns to the start tempo in the same steps, as one uninterrupted run. Leave the target off and it keeps climbing until you stop.
- Start tempo20–400 BPM
- Hold each tempo for1–64 bars · 5 s–30 min
- Increase by1–50 BPM
Ramp plan
60 → 65 → 70 → … → 120 → … → 65 → 60
Back at 60 BPM
Gap trainer
Two bars on. Two bars off. Were you still on it?
The gap trainer silences whole bars while the clock keeps counting. Nothing sounds in a silent bar, and the click returns exactly on the grid, so the landing tells you the truth about your time.
Pick a fixed pattern, let chance decide, or run a ladder that grows the gap one bar at a time. Save your own presets next to the five built in.
- Fixed1–8 click · 1–8 silent
- Random10–80 % silence · cap on runs
- Laddergaps grow up to 16 bars
Coming up
Silent — hold the tempo
Everything in the box
Built for practice, not for menus.
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Dynamic mode
Start tempo, bar count, step. The tempo climbs on its own, stops at your target and can ramp back down.
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Gap trainer
Whole bars go silent while the clock keeps counting. Fixed, random or ladder patterns, plus five presets.
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Sample-accurate click
Timing runs in the native audio engine, not in the UI. What you see lands exactly on what you hear.
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Tap tempo
Tap the pulse you hear four times and the tempo is set. Doubles as a BPM counter for any song.
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Time signatures
2/4, 3/4, 4/4, 5/4, 6/8, 7/8 and 12/8. Compound meters group the way you feel them.
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Subdivisions and accents
Quarters, eighths, triplets or sixteenths. Accent any pulse in the bar with a tap.
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Plays in the background
Screen off, other app open, still clicking. Pause or stop from the lock screen on Android.
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No account, no tracking
Everything lives on your device. No sign-up, no analytics, no network access.
Sound
Five voices. Pick the one you can stand for an hour.
- ToneA pitched electronic burst. Carries over a loud room.
- ClickA sharp rim click. Cuts through busy practice audio.
- WoodA warm, hollow wooden bar. Rounder and darker.
- MechanicalA pendulum tick, with a bell on the accent.
- BlipA soft marimba blip. The least tiring over long sessions.
Questions
Good to know
What is a dynamic metronome?
A metronome that changes tempo automatically while you play. In Accel you set a start tempo, how long to hold each step (in bars or minutes) and how much to add. The tempo rises on the bar line, stops at your target or keeps going, and can step back down the same way.
What does the gap trainer do?
It mutes whole bars while the beat keeps counting. When the click comes back you hear immediately whether you drifted. Choose a fixed pattern, a random one, or a ladder that lengthens the gaps over time.
Can I tap in a tempo or find the BPM of a song?
Yes. Tap the TAP button in the pulse you want. Its border fills with every tap, and on the fourth Accel sets the tempo; keep tapping to refine it. Tap along to a song and the dial shows its BPM, so it works as a BPM counter too. Taps cover 30 to 400 BPM, and it also works while the click is running.
Does Accel work with the screen off?
Yes. The click keeps running with the screen off or another app in front. On Android a lock-screen notification lets you pause and stop; on iOS it uses background audio.
Which platforms are supported?
iOS 15 and later, and Android 8 (API 26) and later. The app is free of accounts, ads and analytics.
Is there a metronome that speeds up automatically?
Yes. Accel Metronome raises the tempo on its own. Set a start tempo (20 to 400 BPM), how many bars to hold each tempo (1 to 64) and how much to add each time (1 to 50 BPM). The tempo steps up on the bar line and lands exactly on your target, or keeps climbing if you set none. Holding each tempo for a set time (5 seconds to 30 minutes) and ramping back down to the start tempo are part of Accel Pro.
What is a gap click?
A gap click is a metronome that goes silent for whole bars while the count carries on, so you keep time on your own until the click returns. In Accel Metronome this is the gap trainer. The fixed pattern plays 1 to 8 bars of click and then 1 to 8 silent bars, with the presets Warm-up (4 click, 1 silent), Classic (2 click, 2 silent) and Advanced (1 click, 3 silent). Accel Pro adds random gaps (10 to 80 percent silence) and a ladder that grows the gap up to 16 bars.
How do I practice with a tempo ramp?
Pick a start tempo you can play cleanly, a target you are working towards and a small step. For example: start at 60 BPM, add 5 BPM every 4 bars and stop at 120 BPM. Accel Metronome changes the tempo only on the bar line, so every new tempo starts with a fresh bar. When the ramp gets too fast, stop and start again a little lower, or use a smaller step.
Is Accel free?
Yes. Accel Metronome is free to download, needs no account and shows no ads. The free version includes every tempo, time signature, subdivision, accent and sound, background playback, dynamic mode in bars (with or without a target) and the gap trainer’s fixed pattern with three presets. An optional one-time purchase, Accel Pro, unlocks timed steps, ramp back down, the random and ladder gap patterns, and saving your own presets.
Download
Start at 60. See where you end up.
Accel is free, works offline and keeps nothing but your settings on your phone.