Find out how many grams fit your calorie target.

It came from a real frustration with other food-logging apps: endless lists to find one food, entries made by other users with wrong macros, the same food duplicated dozens of different ways. There was also no simple way to eat more in one meal than another without doing the math by hand, or to swap a food for a similar one without being stuck eating the same thing over and over. Reversa fixes that: a curated database with no duplicates, a goal you can split across meals however you want, and smart substitutions to vary your plate without missing your target.

Every food in the database has its nutrition values stored per 100 g — or per 100 ml for liquids. You type an amount in grams and the app calculates the calories instantly, or the other way around: you say how many calories you want and see how many grams of that food fit.

You pick a food and Reversa suggests three substitutes on its own, all from the same category and with the closest calorie density. Tap one and the app keeps whatever you had typed and recalculates: ask for 200 kcal and you see how many grams of the new food make up those 200 kcal. Categories are food groups — Meats, Fruits, Cereals, Dairy, Pulses, Seafood, Vegetables, Packaged foods and more.

From three sources. Whole and prepared foods come from the Brazilian TACO table (NEPA/UNICAMP), a public-domain reference. Packaged products with a barcode come from Open Food Facts, the open collaborative database. On top of that we curate entries ourselves, including everything users send in through curation and we approve. That is more than 1,400 foods today, and the base grows with every approved submission.

Yes, and it costs nothing. The app walks you through a short setup that estimates your daily expenditure from sex, weight, height, age and activity level, then adjusts it to your goal — lose weight, maintain or gain muscle. Advanced settings let you swap the default formula for Katch-McArdle. In the last step you pick which meals you eat and adjust the share of each one — the app splits calories and macros between them, and those targets then apply in your diary.

No. The free plan includes the full calculator (grams ⇄ calories and food swaps), the daily macro goal, the barcode scanner, adding your own foods, today's diary, calorie history for the last 7 days and up to 10 favorites. PRO unlocks macronutrients (protein, carbs and fat) on every result, unlimited favorites, the full diary with week planning and browsing any date, calorie history beyond 7 days (30, 90 days or all time), and full nutrition details for any favorite. There are three billing cycles: monthly, quarterly or annual, and all of them start with 7 days free.

Yes. The subscription is billed by the App Store or Google Play and can be cancelled at any time in the store itself, with no fee and no paperwork. PRO access lasts until the end of the period you already paid for.

iOS and Android, with the same account synced across both.