GrooveLock: a free metronome with every pro feature

GrooveLock is a free online metronome with sample-accurate timing. No ads, no paywall, no account: everything stays on your device.

• Tempo from a dial, tap tempo or the keyboard
• Any time signature, subdivisions, swing and per-beat accents
• Choice of click sounds
• Count-in bars before the music starts
• Polyrhythms (3 against 4, 5 against 4 and more) with their own sound
• Speed trainer that raises the tempo every few bars or seconds, then holds, starts over or goes back down and up again; gap trainer and random mute
• Headphone delay calibration, so the screen stays in sync with Bluetooth audio
• Practice timer
• Song parts: verse, chorus and bridge with their own tempo and time signature (for example 4/4, then 7/8), played in order, also parts that alternate bars like 5/8 + 7/8; repeat the whole song
• Songs and setlists, with export and import
• Dark and light theme, or follow the system; reduced visual effects on request
• Installable as an app from the browser; works offline

Works in the browser on phones, tablets and computers. iOS and Android apps are coming.