# Kada

> Kada is a free, private habit tracker for iPhone (Android in early access). No account, no ads, nothing locked behind a paywall; habit data stays on the device. Forgiving streaks with an earned grace day, Habit Strength based on habit-formation research, Yes/No, Counter and Quantity habits, reminders and widgets. Available in Portuguese, English, Spanish, German, Italian and French.

Every page on this site is also available as markdown: request it with `Accept: text/markdown`. Agents can also use the MCP server at https://kada.day/mcp (tools: get_app_info, search_help, list_articles, get_article, get_changelog).

## App

- [Kada home (English)](https://kada.day/en): what the app does, screenshots, privacy
- [Kada home (Português)](https://kada.day/)
- [Download on the App Store](https://apps.apple.com/us/app/kada-one-habit-a-day/id6792284029)
- [Android early access](https://kada.day/en/android)
- [What's new / changelog](https://kada.day/changelog)

## Help

- [Help center](https://kada.day/help): Answers about Kada: creating habits, streaks and the grace day, skip days, Habit Strength, reminders, widgets, backups, privacy and the tip jar.
- Getting started: [How do I create my first habit?](https://kada.day/help#first-habit), [What’s the difference between Yes/No, Counter and Quantity?](https://kada.day/help#habit-types), [How do I change the language or switch to dark mode?](https://kada.day/help#language-appearance), [Is there an Android version?](https://kada.day/help#android)
- Habits & streaks: [Which schedules can a habit have?](https://kada.day/help#schedules), [I missed a day. Is my streak gone?](https://kada.day/help#grace-day), [What does “Skip” do?](https://kada.day/help#skip-days), [How is Habit Strength calculated?](https://kada.day/help#habit-strength), [Can I log or fix a past day?](https://kada.day/help#edit-past)
- Reminders & notifications: [How do I set up a reminder?](https://kada.day/help#reminder-setup), [My reminders don’t arrive. What can I check?](https://kada.day/help#reminders-not-arriving)
- Widgets: [How do I add the Kada widget?](https://kada.day/help#add-widget), [The widget isn’t updating.](https://kada.day/help#widget-not-updating)
- Data, backup & new phone: [Where is my data stored? Is it synced?](https://kada.day/help#where-data), [How do I back up my data?](https://kada.day/help#export-backup), [How do I move to a new phone?](https://kada.day/help#new-phone)
- Privacy: [Does Kada collect any data?](https://kada.day/help#privacy-collect)
- Tip jar & purchases: [What is “Support Kada”? Does it unlock anything?](https://kada.day/help#tip-jar), [Why is there no “Restore purchases” button?](https://kada.day/help#restore-purchases)
- Troubleshooting: [A habit isn’t showing on Today.](https://kada.day/help#habit-missing-today), [How do I start over?](https://kada.day/help#start-over), [Something is broken. How do I report it?](https://kada.day/help#contact)

## Articles

- [How long does it take to form a habit? Read the curve, not the deadline](https://kada.day/en/articles/how-long-does-it-take-to-form-a-habit): How long does it take to form a habit? A median of 66 days in the key study, from 18 to 254. The curve week by week, and why 21 days is a myth.
- [Missed a day? What a broken streak really does to your habit](https://kada.day/en/articles/missed-a-day-habit-streak): Missed a day and broke your habit streak? What one miss really does, why broken streaks make people quit, and how to restart without going back to day 1.
- [Does habit tracking work? What 138 studies say, and when to stop](https://kada.day/en/articles/does-habit-tracking-work): A meta-analysis of 138 experiments says tracking helps you reach goals, most of all when you write it down. What to track, how to read it, and when to stop.
- [Implementation intentions: how to write if-then plans that actually work](https://kada.day/en/articles/implementation-intentions-if-then-plans): Implementation intentions are if-then plans: “If X happens, I will do Y.” What 642 studies found, how to write good ones, and dozens of real examples.
- [Is there a best time of day to build a habit?](https://kada.day/en/articles/best-time-of-day-to-build-a-habit): Is the best time of day to build a habit the morning? What the one direct study found, why consistency matters more, and how to pick a slot for each habit.
- [How private is your habit tracker? What to check before you log your life](https://kada.day/en/articles/private-habit-tracker): Habit logs reveal sleep, drinking, medication and mood. How to check a habit tracker’s privacy: account, storage, SDKs, privacy label, export and delete.

## Policies

- [Privacy policy](https://kada.day/privacy)
- [Support and contact](https://kada.day/support)

## Optional

- [Full text of the help center and articles](https://kada.day/llms-full.txt)
- [Articles (pt)](https://kada.day/artigos)
- [Articles (es)](https://kada.day/es/articulos)
- [Articles (de)](https://kada.day/de/artikel)
- [Articles (it)](https://kada.day/it/articoli)
- [Articles (fr)](https://kada.day/fr/articles)