Photo, sentence, or barcode in. A full macro breakdown out. Native iPhone app, no ads, no account. Read the accuracy data.
meals sent through 0xCal
110 foods, tested weekly against USDA reference values, alongside the apps most people switch from. Full methodology and per-food results.
85.6%
average accuracy
58.9%
same 107 foods
56.9%
same 107 foods
Two corn cobs, one plate, one unbroken take. Keep scrolling and the recording runs on to the second half.
Your iPhone's depth sensor sizes the plate and sends that measurement with the photo, so the portion is read off the scene instead of judged by eye. On LiDAR models it runs as Ruler+. There is no extra step and nothing to put in the frame for scale.
⌀ ~30 cmplate, measured~180 gedible weight
The answer is a thread, not a receipt. "And some butter" goes back into the same conversation and the estimate is rebuilt rather than replaced: 173 kcal for the corn alone becomes 245, itemised as ~180 g corn plus ~10 g butter. Pull the butter down to 5 g and the total settles at 209.
173 → 245after one sentence209 kcalafter one correction
Not a food diary you have to assemble. You say what you ate, in whatever words you use for it, and each line comes back with numbers attached.
day total2 546 / 2 205 kcal
2 fried eggs
180 KCAL
1g carbs / 14g fat / 12g protein
320g package of Pierogi Ruskie
573 KCAL
60g carbs / 15g fat / 22g protein
Big Mac with fries and a Cola Zero
970 KCAL
104g carbs / 43g fat / 30g protein
Kotlet drobiowy with mashed potatoes
404 KCAL
38g carbs / 15g fat / 26g protein
4 pieces of pizza
1 200 KCAL
150g carbs / 56g fat / 48g protein
500ml energy drink, zero sugar
37 KCAL
2g carbs / 0g fat / 0g protein
Values come from one day logged in the app and are AI estimated. Photography is illustrative, not the actual plates.
Every entry breaks into ingredients with their own weights. Push the fries from 117g to 160g and the total follows. No single opaque number you either accept or delete.
The first pass is a model estimate and says so on every row. You can log it and move on, or go one level deeper.
Search the catalog and swap the guess for the actual jar, box or bottle, with the nutrition table that came off its label.
Once a food is in your pantry, later meals attach to it instead of guessing again. Correcting a food once is the whole point.
The app shows this ledger the first time you open the pantry, so the three states are never a mystery.
Most trackers make you find the food. 0xCal reads what you wrote, looks it up in a real catalog, checks the result against physics, and remembers the answer for next time.
All three go through the same sheet. There is no menu asking you to pick a logging method first, because picking one is the part people quit over.
Search merges a shared community catalog with Open Food Facts, filtered by your language and country, so "twarog poltłusty" and "half fat cottage cheese" both land on something a person actually put in a shopping basket.
Stated calories are compared with what the stated macros can physically account for. Typos, unit mix ups, and placeholder rows get rejected at write time instead of quietly poisoning everyone's search results.
Every food keeps a use count, a last used date, and four time of day counters. The oat milk you have every morning sits at the top at 8am and drops away by 8pm.
Phone propped against the kettle, hands wet, something about to burn. Big targets, fast number entry, and a draft that survives being interrupted are correctness requirements here, not polish.
On packaged staples everybody is close. The spread opens on what people actually eat: something cooked at home, something ordered out, something with a name in another language.
Homemade mealscooked from scratch, no label to scan
87.2%
67.7%
67.8%
Restaurant dishesordered out, portion unknown
84.4%
63.0%
65.5%
International cuisinenamed in a language the database was not built in
86.2%
66.0%
65.6%
Misspelled entries"mackdonal chiken nugits"
87.0%
no result
no result
Fast foodthe category every tracker is supposed to nail
97.5%
86.6%
89.2%
Benchmark run of Jul 29, 2026. Reruns weekly, published win or lose.
Start, adjust or end a window without leaving the day. The bar under the log shows where you are in it, instead of a separate tab you forget to open.
Open it, say what you ate, done. Everything in the list below is missing on purpose.
0sign up screens between you and logging
Coffee is 240ml of hydration and 95mg of caffeine at once. Both get their own budget, and a zero sugar can still lands in the calorie log.
Live scan for packaged food. When a barcode is in no catalog, on device text recognition reads the nutrition table off the back instead.
Garmin, Whoop, Oura, Withings, Fitbit, Strava, Polar and veSync all write to Apple Health. Turn it on once and their steps, workouts and weight move your calorie budget.
Still stuck? Every screen in the app has a question mark that explains the numbers on it.
Take a photo of your plate and 0xCal identifies the foods, estimates portions, and returns calories, protein, carbs, and fat in seconds. Adding a short text note ("about 200g of rice") tightens the estimate.
Yes. Type what you ate in plain English, like "2 fried eggs and toast with butter", and 0xCal parses it into a full calorie and macro breakdown. It handles typos and misspelled brand names too.
0xCal publishes weekly public benchmarks testing over 100 foods against USDA reference data. See the full methodology and per-food results on the benchmarks page.
Yes. Steps, weight, and dietary energy flow both ways with Apple Health, and your activity adjusts your daily calorie budget.
Yes. Fasting window tracking is built in, so you can manage eating and fasting periods in the same app.
Yes, through Apple Health. Connect your wearable to Apple Health, enable Apple Health in 0xCal, and steps, weight and workouts flow in. Garmin, Whoop, Oura, Withings, Fitbit, Strava and Polar all work this way.
Yes. Cal AI was removed from the App Store in April 2026 for bypassing Apple's payment system. 0xCal offers the same AI photo logging plus natural language input, with transparent Apple billing. Read the full comparison.
0xCal offers a free trial with all features included, then one simple subscription. No tiers, no ads. No account is required, billing runs through Apple, and you can cancel anytime in iPhone Settings.
0xCal is on iPhone at founders pricing. One subscription, trial included, every feature unlocked.
