Open Source Android Fitness Trackers

BetterCounter is a simple, open-source Android application designed to track daily habits, recurring activities, and other countable events. It allows users to create counters for behaviors such as exercising, smoking, drinking, or completing personal routines. Each counter increment records its exact date and time, preserving a detailed history of activity. Users can review graphs and calculated statistics to understand how frequently specific events occur. The application also helps track the last time an activity was performed, making it useful for irregular maintenance tasks or personal reminders. Counter data can be exported for external analysis or recordkeeping. BetterCounter prioritizes simplicity and privacy by keeping information on the device without transmitting it to external servers, except through optional Android backup services.

OpenNutriTracker is a free, open-source calorie and nutrition tracking application for Android and iOS. It helps users record food intake, monitor nutritional goals, and understand eating patterns while keeping personal records on their devices. Its food database integrates Open Food Facts, USDA FoodData Central, and German nutritional references. Users can log meals through food searches, barcode scanning, or quick calorie entries. The application calculates personalized calorie and macronutrient targets using body measurements and activity levels. Daily and weekly reports visualize calorie consumption, macronutrients, micronutrients, hydration, and weight changes. Additional tools include reusable recipes, activity tracking, and optional intermittent fasting timers. Encrypted local storage, customizable themes, and data export options support privacy and portability.