Know what your food is doing for your body.
NutrientOS is a nutrition and fitness tracking app. It tracks calories and macros like any tracker, and then keeps going: micronutrients, food quality, how filling a meal is, your training, sleep, hydration, and recovery — so a day of eating tells you something you can actually use.
Free plan includes full manual tracking, Food Grade, satiety, and micronutrients. Available on iOS, Android, and the web.
See what NutrientOS actually tracks
Real screens from the app. Pick a capability to see the screen that does it.
Calories and macros, with the day already added up
Calories eaten against your target, then protein, carbohydrate, and fat as grams and percentages. Underneath, the day’s best choice and the biggest gap left to close.
What NutrientOS tracks
Macros that fit your goal
Protein, carbohydrate, and fat targets derived from your goal, measurements, and activity, tracked per meal so a shortfall is fixable while the day is still going.
Micronutrients, honestly reported
Vitamins and minerals totalled across the day, with unmeasured values shown as unknown instead of counted as zero.
Food Grade
A quality read on every food, computed from its nutrition and processing level, with the specific reasons behind the grade shown.
Satiety estimates
How filling a food is likely to be, so the same calorie budget can go to meals that actually hold you.
Training and recovery
A training plan, logged sessions, sleep, hydration, and supplements sitting next to your nutrition rather than in three other apps.
Biometrics as trends
Weight and measurements read as a direction over weeks, feeding back into your calorie and macro targets.
Faster logging
Barcode scanning, saved foods, recipes, restaurant menus, and photo-assisted meal logging, because the days you skip are the ones that decide the outcome.
Your whole food diary
Search, barcodes, recipes, and scheduled meals, with per-meal and per-day totals for everything the app tracks.
Tracking that does not stop at the calorie total
A calorie number answers one question. It cannot tell you why you were starving by mid-afternoon, why a month of adherence produced nothing, or whether the diet that looks fine on paper is quietly short on half a dozen nutrients.
All of that is already implied by what you log. NutrientOS keeps it instead of discarding it: what the food contained, how processed it was, how long it is likely to hold you, and what your training and sleep were doing at the same time.
Logging fast enough to keep doing it
Tracking only works if it survives a busy week. NutrientOS covers packaged food with barcode scanning, home cooking with recipes and saved foods, eating out with published restaurant menus, and mixed plates with photo-assisted logging that gives you a draft to correct rather than a blank search box.
Meal scanning is a speed feature, not an oracle. You confirm every item before it reaches your diary, and portion estimates from a photo are approximate by nature.
Honest about what it knows
Unmeasured nutrients are shown as unknown, never as zero — the difference between "nobody measured this" and "this food contains none of it" is the difference between a data gap and a false conclusion.
Food Grade, satiety, and estimated glycemic impact are informational signals computed from nutrition data, each shown with its reasoning. They are not medical advice, not a diagnosis, and not clinically validated. The methodology page sets out exactly how each one is calculated and where it breaks down.
Start tracking
Install NutrientOS on your phone, or open it in your browser.
Creating fitness or nutrition content?
NutrientOS works with micro-creators: complimentary Premium for approved active creators, a personal referral code, and a commission on verified paid referrals.
See creator opportunities