Yes, using the app is completely free, including features such as barcode scanning, food diary and weight and body fat percentage tracking graphs. All features are available at no cost, and their upkeep is funded by ads shown in the app.

The app uses a public open third-party database for product information. Users can also add missing products and recipes to the system themselves, making them discoverable for other users.

We value your privacy, so account deletion has been made as easy as possible. You can do it yourself directly from the app:

• Go to Settings in the app.
• Click "Delete account and all data".

Note: deletion is immediate and irreversible. It destroys all your personal entries from our database, including your weight history and food diary, and these cannot be recovered.

If you have shared a recipe or food item to the shared public database, the food data itself remains on the platform for others to use.

Yes. The weight and body fat data you enter is used solely within the app to calculate your calorie needs and track your progress. RestinCal never sends this health data to advertising networks (such as Google AdSense). Ads are based only on the general theme or your own browser history.

No. The app's calculations are mathematical estimates based on commonly used formulas. They are indicative estimates and tools for self-monitoring. If you have health conditions, are pregnant, have a history of eating disorders or anything similar, always consult a healthcare professional before using the app.

There is no single exact number because energy needs and a suitable rate of change are individual. A TDEE calculator gives a directional starting point that you can compare with several weeks of food and weight tracking. An estimated daily deficit of 300–500 kcal can be moderate for many people, but actual weight change, hunger and energy levels vary. Our calorie calculator supports tracking but does not provide personal medical advice.

Macros, protein, carbohydrates and fat, are the three nutrients that provide energy. Protein (4 kcal/g) builds and maintains muscle, carbs (4 kcal/g) are the body's primary energy source, and fat (9 kcal/g) is important for hormones and vitamin absorption. When losing weight, a good starting point is 1.6–2.2 g of protein per kilogram of bodyweight, with the remaining calories split between carbs and fat to taste.

BMR (basal metabolic rate) is the number of calories your body burns at complete rest, just to stay alive. TDEE (total daily energy expenditure) also accounts for movement and everyday activity, so it reflects what you actually burn per day. TDEE is the number your calorie target is based on. Read more in our BMR article.

A commonly cited safe rate is about 0.5–1% of bodyweight per week, i.e. roughly 0.3–0.8 kg for most people. Losing too fast increases the risk of muscle loss, fatigue and nutrient deficiencies, and makes the result harder to maintain. A moderate deficit with enough protein and good recovery produces the most durable results.

No. For many people, calorie counting is above all a learning period: a few weeks or months of tracking teaches portion sizes, the energy density of foods and your own habits so well that you can later estimate without logging constantly. Some continue because they find it clarifying, but it isn't required for success.

The scale varies day to day for reasons unrelated to body fat: hydration, salt intake, carbohydrate stores, gut contents and hormones can swing your weight by 1–2 kg within a single day. That's why you should watch the trend over several weeks rather than individual days. Our weight tracking tool draws a trend line that smooths out the daily noise.

Yes. RestinCal works in the browser on phone, tablet and computer with no download required. You can add it to your home screen like an app: open the site in your browser and choose "Add to Home Screen" (from the Share menu on iPhone, or the browser menu on Android). After that it opens with its own icon like a regular app.

Weight change is related to energy balance over time, and exercise is not an absolute requirement for weight to decrease. Physical activity still has many health benefits and may support fitness, lean mass and weight management. In my own experience, a manageable diet and everyday movement work better together than overly strict rules.