How it works, and where to write.

A run counts consecutive scheduled days. If a rule was due on a day and you marked it broken, the run goes to zero and starts again from the next kept day. There are no freezes, repairs or grace days — that is the point of the app rather than an oversight.

Days a rule was not scheduled for do not break the run. If a rule only runs on Tuesday, Thursday and Saturday, the days between are ignored entirely.

No. Today is not counted as missed until you review it. Kantetsu is retrospective: you look back at a day once it is over. A day you have not logged is simply unreviewed.

Once a rule has been logged, its schedule is locked for the days already behind you, and any change applies from now on. If schedules could be rewritten backwards, every past streak would become editable and the number would stop meaning anything. Rule titles have no effect on the arithmetic and stay editable, so typos are always fixable.

Create an account in the app, then upload from the device that has your history and download onto the other one. Sync is manual and directional — you choose which way it goes, and nothing is merged silently behind you.

No. Archived rules keep everything. You can reveal them at any time to look back at what they recorded.

No. Kantetsu does not nag, and adding reminders would make it a different app. Reviewing yesterday is a habit you keep or do not — which is the thing being measured.

Deleting the app removes everything stored on the device. Account deletion is available in the app and permanently removes your account and everything uploaded with it from the server. See the privacy policy for the full detail.

Yes. Free to download, no subscriptions, no in-app purchases, and no advertising.