See your health as patterns, not just calories.

Log4Health is now in public beta. The app is fully available, and feedback from every screen goes directly to the person building it.

Log4Health is a free health tracker for food, activity, water, sleep and mood. It helps you keep an honest record of daily habits, notice changes over time and learn from what you actually do – without prescribed plans, pressure or judgement.

START LOGGING STRAIGHT AWAY

There is no account, login or setup flow. Open the app and begin. Every field is optional, so you can record as much or as little as you want, save a partial entry and finish it later.

FOOD LOGGING THAT MEETS YOU WHERE YOU ARE

Type what you ate in plain language – such as "2 eggs, toast and coffee" – and Log4Health breaks it into recognised foods with estimated calories and nutrition.

When you do not want detail, use quick add by food category. You can also enter foods manually.

Detection is only a starting point. Relink a food, split a dish into ingredients, combine items, edit nutrition values, add an ingredient or delete what is wrong. Reuse a past meal instead of starting again.

The food database contains around 3,600 generic, international foods sourced mainly from national nutrition databases. It is designed to return real foods rather than pages of branded supermarket products. Food search also understands Dutch, Spanish and French names. Foods carry a plain-language health rating, from Super Healthy to Very Unhealthy, calculated with the European Nutri-Score method wherever the nutrition data allows.

Once you have logged for a few days, previous meals make the next entry quicker. You do not need perfect calorie estimates. Good-enough records are enough to build a useful picture.

ACTIVITY, WATER, SLEEP AND MOOD

Log an activity by type, intensity and duration. Estimated calories burned use those details plus your body weight. Name a regular walk, run, ride or other activity once, then reuse it with its details prefilled.

Water logging is deliberately minimal.

For sleep, record duration and rate how well you slept. You can optionally enter bedtime and wake time.

For mood, record mood and energy separately, choose the part of the day and add notes when useful.

SEE THE DAYS AND WEEKS YOU RECORDED

Day insights place food, activity, water, sleep and mood side by side. Review calories in and out, macronutrients, salt, food groups, fruit and vegetables, activity intensity, hydration, sleep quality and mood.

Week insights show your recorded week through charts, macro traffic lights and fruit-and-vegetable strips. Month views show your tracking rhythm and calendar. Log4Health reflects what you record; it does not diagnose, prescribe or claim that one habit causes another.

QUIET BY DESIGN

• No subscription, ads or in-app purchases
• No account or login
• Offline-first: your diary stays on your device
• No reminders, streak pressure or guilt
• No prescribed programme or forced goals
• No fitness-device or smartwatch integration
• Feedback is available from every screen

The in-app Library offers short explainers and curated links. Use Log4Health at your own pace. You do not need to track perfectly. Just begin.

CREDITS

Some icons in the app have been used from the Noun Project under the Creative Commons License BY 3.0. See the full list of attributions: https://log4health.com/noun-project-icons-attribution.