A carb tracker that shows its work.
Carbium counts net carbs and calories on your iPhone using published formulas and a food database that ships inside the app. No account, no AI, and nothing to sign up for.
Download on the App Store
Net carbs, not total carbs.
Your body does not break fiber down into glucose, so it does not raise blood sugar. That is why low-carb and keto diets count net carbs. Carbium does the subtraction on every food, every time, and shows you the arithmetic if you want to check it.
Log in seconds.
Search, scan a barcode, repeat a saved meal, or enter a custom food. Net carbs, protein and calories land on today's totals, and your targets update as you go.
- Recents log again in one tap
- Barcode scanning, free forever
- The food database ships in the app, so search works offline
- Custom foods with your own numbers
The database is in the app.
Thousands of generic whole foods from USDA FoodData Central ship inside Carbium, so search works in a basement, on a flight, anywhere. Nothing you type goes to a server.
- Net carbs and calories on every row
- Keto and low-carb flagged as you scan the list
- Your own foods listed alongside the built-in ones
- No sign-in, no lookup call, no waiting
See the whole arc.
Streaks, rolling averages and a chart of every logged day against your target. Days over the line are marked, not hidden, because the pattern is the useful part.
- 7, 14, 30 and 90 day ranges
- Net carbs or calories
- Every day you have logged, kept
What you actually burn.
Carbium compares what you logged against how your weight really moved, then reports what you burn. Below roughly two weeks of data it says so plainly and uses the Mifflin-St Jeor formula instead.
- Measured against formula, side by side
- Shows the data behind the number
- Ignores your first ten days of weigh-ins, because early low-carb loss is water
The trend, not the noise.
Daily weight is mostly water. The chart draws a smoothed trend through the noise with your raw weigh-ins behind it, so one bad morning does not read as failure.
- 7, 30 and 90 day change at a glance
- 1M, 3M, 6M and all-time ranges
- Pounds or kilograms
Plan the week.
Carb cycling without the arithmetic. Give each weekday its own net-carb target and the app applies it, so a training day and a rest day are not the same day.
- A separate target for every weekday
- Rings, streaks and history all follow the plan
- Set it once, no daily editing
The meals you repeat.
Most people eat the same handful of things. Build a meal once and log the whole thing in a single tap, with every food and portion remembered.
- Build from any food in the database
- One tap logs the entire meal
- Totals shown before you log
Everything in the app.
The full list, with nothing hidden behind an asterisk.
Free is a complete tracker.
Not a trial, and nothing expires. Pro adds the analysis on top.
Free
- Unlimited food logging
- Barcode scanning
- The whole built-in food database
- Daily calorie and macro targets
- Weight logging
- 7 days of history
- 1 saved meal
Carbium Pro
- Adaptive TDEE
- Weight chart and smoothed trend
- Unlimited history
- Weekly carb plan
- Unlimited saved meals
- CSV export
Your log is yours.
Everything you enter lives on your device, with a backup in your own iCloud so it survives a lost phone and a reinstall. There is no account, no analytics, and nothing for us to collect. Barcode scans send the barcode digits to Open Food Facts, and nothing else.