Sudoku Journey
Daily Sudoku, a 160-level journey with stars and boosters, and hints that teach.
Calm, useful Android apps.
ZK Lab makes small apps that do one job well: puzzles, a car logbook, a fasting timer and everyday trackers. No accounts. Your data stays on your phone.
Our apps
Two apps are on Google Play today. The rest are in closed testing and coming soon.
CarJot
Log fill-ups, services and MOT dates. Offline, no account, no subscription.
Pause
In testingAn intermittent fasting timer for 16:8 and more, with stages, streaks and a Wear OS tile.
Stillstone
In testingMahjong solitaire with big, clear tiles and a new board every day.
Spent
In testingLog spending in two taps, set a budget and see where your money goes.
Recur
In testingTrack subscriptions and bills, see your monthly spend and never miss a payment.
Ritual
In testingBuild daily habits with streaks, reminders and a widget you can tick from.
Soon
In testingCount down to trips, birthdays and holidays with big, beautiful widgets.
No accounts
Open the app and start. Nothing to sign up for, no password to forget.
On your phone
What you enter is stored on your device, not on our servers. We don't run any.
Fair pricing
The core of every app is free. Where there's something to buy, each app's page says exactly what it is.