Metronome apps have turned into subscriptions with ads between your scales. Baton goes the other way: everything a musician needs to practise is free, and one small purchase — once, ever — unlocks the extras. That's the whole business model.

Baton is engineered for a steady, even click — the beat is scheduled on the audio clock itself, not a timer that wanders when your phone gets busy. The pendulum you see follows the sound you hear.
Tempo from 20 to 400. A giant tap-tempo pad that reads your drumming and settles on the number you meant. Two taps from launch, you're practising.

Eighths, triplets, sixteenths, swing, offbeats — the practice tools other metronomes lock away are simply free here, in every time signature from 1/4 to 16/16.
Tap any beat dot to cycle it: accented, normal, ghosted, or silent. Build the bar your piece actually needs — a 7/8 with a ghosted four and a silent seven is two taps away.

Warm mahogany wood by default; ivory, brass, velvet, neon, graphite and glacier behind the one-time unlock. Every skin restyles the whole face — and your TV, when you cast.
Click packs to match: classic and beep free, woodblock, sticks, cowbell, clave, hi-hat and marimba in Pro. Accent and beat are separately voiced in every pack, so the downbeat always reads.

The speed trainer ramps the tempo a few BPM every few bars — set it from 80 to 160 and chase it. The gap trainer mutes whole bars while the visuals keep moving: hold the time yourself, then check back in.
Polyrhythms click three against four (or any pair up to twelve) with the counter-voice on its own sound, so your ear learns to hold both.

Save any face setup as a song — tempo, meter, subdivision, accents — name it, order it, and load it back with one tap. Fifty songs, on the device, yours.

Glacier and ivory are full daylight skins for sunlit rehearsal rooms and music stands by the window — same face, nothing squints.
Baton casts to your TV — a big pulse and beat count the whole band can follow — or to a speaker, clicking through the PA at rehearsal. The click plays while Baton is on screen, and keeps going on your TV or speaker when you cast; your phone stays the remote.
The free tier is a complete metronome, not a demo. Pro adds the trainers, the setlist, six skins and six click packs — one purchase, once, priced in your local currency on Google Play. No subscription, yours for good. The only time Baton touches the network is Google Play's billing for that one purchase, and casting to your TV or speaker.