Habit OS — Habit Tracker

A calm habit tracker. Define the smallest version of each habit, log it, watch the streak hold. Offline, free, no account.

Habit OS is a quiet habit tracker built on one idea: you build a habit by showing up, not by being perfect.

Every habit is defined by its minimum action — the smallest version you can still do on a bad day. Log it, and the loop holds.

What's inside: • 15 ready-made habits across morning, evening, exercise, learning, health, environment and quitting — added with one tap • Or build your own: name, minimum action, icon, color, build-or-break type • Log how it felt, mark a day as hard, add a note. Log more than once a day if you want • Habit strength and streak calculated for you, with four clear states • Today view with progress and a 7-day chart • Stats for the last 7 and 30 days: completion rate, perfect days, best streak, habit ranking • Per-habit detail with a monthly heatmap and full log history • Local reminders — several times per habit, on the weekdays you choose • 5 themes, 38 languages, quiet milestone moments along the way

Fully offline. Your data stays on your device. No account, no sign-up, no tracking, no ads, no in-app purchases. Erase everything in one tap whenever you like.