# Countiful > Countiful is a "days since" tracker app that helps you track habits, milestones, and streaks. Available on web, iOS, and Android. Countiful lets you create counters that track how many days, weeks, months, or years since (or until) an event. Set goals, view streaks on a calendar, and get reminders. Free to use with optional sync across devices. Countiful can only be used on the web at countiful.com or through the mobile apps on iOS and Android. ## Pages - [Home](https://www.countiful.com/): Landing page and product overview - [Download App](https://www.countiful.com/app): Download links for iOS and Android - [App for Tracking Habits](https://www.countiful.com/app-for-tracking-habits): Guide on using Countiful for habit tracking - [Habit Tracker Google Sheets](https://www.countiful.com/habit-tracker-google-sheets): Comparison with spreadsheet-based tracking - [Bad Habits Examples](https://www.countiful.com/bad-habits-examples): The 10 most harmful habits people actually track and break - [Old Habit](https://www.countiful.com/old-habit): Science-backed guide to breaking old habits, with neuroscience research - [Privacy Policy](https://www.countiful.com/privacy): Privacy policy - [Terms of Service](https://www.countiful.com/terms): Terms of service ## Authentication - [Login](https://www.countiful.com/login): Sign in to your account - [Register](https://www.countiful.com/register): Create a new account ## Apps - [App Store](https://apps.apple.com/app/countiful-habit-tracker/id6758385361): iOS app - [Google Play](https://play.google.com/store/apps/details?id=com.mtsdigital.since): Android app ## Key Facts - 100% free habit tracker with no ads and no premium tier - Available on iOS, Android, and Web with cross-platform sync - 4.9 star rating across app stores (100+ reviews) - Features: streak tracking, reset behavior analytics, goals, reminders, calendar view, data export - Built by MTS Digital Ventures SRL, Bucharest, Romania - Contact: hello@countiful.com