A no-shame habit tracker. Miss a day and the chain still holds.
Today
Start with one small thing
One page. One glass of water. One short walk. Pick a starter below, or build your own — we’ll keep the chain for you.
The chain
Last 16 weeks, every habit combined
Inspired by the "don't break the chain" method — the visual habit-tracking calendar popularized by comedian Jerry Seinfeld.
Insights
—30-day completion
0best current chain
0total check-ins
Add a habit
Habit
0current chain
0longest chain
0freezes banked
Tap any day to check in, use a freeze, or leave a note. Arrow keys move around the grid once it's focused.
Day
Habit lab
Small, cited ideas for making a habit actually stick.
The Four Laws
Six ideas worth knowing
Settings
Theme
Comfort
Turns off the ink-in animation, count-up and paper grain — everything becomes instant.
Your data — it lives on this device
Nothing is sent anywhere, ever. Back it up so you never lose it.
Fresh start
Deletes every habit and all history on this device. Can't be undone — back up first.
About
Keystone · CodeByMobile · v1.0.0
About Keystone
A warm, offline habit tracker built on the science of habit formation — by CodeByMobile. Missing a day never zeroes your progress.
Method & sources
Keystone's coaching is drawn from James Clear's Atomic Habits (2018) — identity-based habits, the Two-Minute Rule, habit stacking, "never miss twice," and the Four Laws of behavior change — and BJ Fogg's Tiny Habits (2020) on celebrating right after you act. See the full list any time in Habit lab.
Your privacy
Keystone works entirely on your device. Your habits and check-in history are stored locally and are never sent anywhere — no accounts, no sign-in, no analytics, no tracking. Back up your data any time from Settings → Your data.
Give back
Keystone is free, forever — every feature, no account, no upsell. If it helps you, consider passing it along: share the link with a friend, a student, or a support group. Teachers, counselors and recovery groups are welcome to use it with a whole classroom or group at no cost.
How it was made
Built by hand as a fast, offline web app. AI tools helped with wording, layout drafts and artwork; all code was written, reviewed and is owned by CodeByMobile.