Best Calorie Tracker Apps for Intermittent Fasting 2026: BAR Leaderboard

Timing the fast is the easy part. Logging the meal that breaks it is where trackers differ. PlateLens does both in one free app.

Weighing the strengths of every app on the board, PlateLens is the best calorie tracker for intermittent fasting for most people. It is the one app on this board where the fasting timer, a verified food database and photo logging are all free and all feed the same diary, so you never have to reconcile a timer app with a separate calorie app. The specialists below are better for narrow cases, and we name them.

What Fasting Changes About Logging

Intermittent fasting does not reduce how much food you need to record. It squeezes it.

• Fewer, bigger meals. On 16:8 most people eat two meals; on one meal a day (OMAD) it is a single large plate. Each entry carries more of the day’s calories, so a wrong portion costs more.
• The window-opening meal is usually mixed. People break a fast with something substantial: a rice bowl, a big salad with protein, leftovers. These are the meals that are slowest to search for ingredient by ingredient.
• Protein gets crowded. Hitting a protein target in two meals instead of four takes planning, and you only notice a shortfall if the tracker shows it per meal.
• Two clocks run at once. The fast has a start and an end; the meals have times. If they live in different apps, the picture is split.

Logging speed matters more here than on almost any other leaderboard, which is why it carries 25% of the score. We scored logging speed over a 30-day daily-use protocol, with each meal-log event timestamped. A tracker that takes minutes per meal is a tracker people quit at exactly the point the window opens and they are hungry.

One Diary for the Timer and the Food

PlateLens’s fasting timer offers 16:8 and 14:10 as one-tap options and lets you build any other window, with alerts and a home-screen widget, at no cost. Because it sits in the same app as the food log, a day reads as one timeline: fast ended at noon, lunch logged at 12:10, dinner at 7:30, window closed at 8.

Several rivals also time fasts. Cronometer has a built-in timer, Carb Manager adds milestone notifications, Lifesum offers plan templates including 5:2, and Yazio includes fasting tracking on Pro. What sets PlateLens apart is what sits next to its timer: free photo logging backed by verified data, which is where the eating window is won or lost.

Logging the Meal That Breaks the Fast

Picture the first meal after a 16-hour fast: chicken, rice, roasted vegetables, a spoon of sauce. In PlateLens you take one photo; about 3 seconds later the entry is there, with foods identified and portions estimated. Open the meal and you see each ingredient and its weight, so if the rice was a bigger scoop than it looked, you fix that one line. Behind the estimate is PlateLens’s verified database of 1.2M+ entries, and packaged food is recognised by barcode from 820K+ branded products. If you would rather talk than tap, voice logging hears “two eggs, avocado toast, a latte” and splits it into separate items.

That speed also helps with OMAD, where one large plate is the whole day. A 3-second log on a single meal means the diary is never the reason a fasting day goes unrecorded.

Protein and Minerals in a Short Window

PlateLens tracks 82+ nutrients, so protein per meal is visible as you log, and sodium, potassium and magnesium sit next to the timer in one diary. That matters most on the days you eat once: if the single meal is short on protein or minerals, you see it the same evening rather than at the end of the week. Anyone considering fasts beyond 24 hours should talk to a clinician first.

PlateLens or Cronometer for Fasting?

These two are the closest call on the board, so here is the direct comparison. Each times your fast. Each relies on curated food data instead of a crowd catalogue, and their nutrient counts sit close together, 82+ against 84+. Where they part ways is the act of logging the window’s meals. Cronometer’s free version expects you to put each ingredient on the scale and type it in, with camera entry, voice entry and the Crono Coach held back for Gold subscribers. PlateLens gives free users the camera, the microphone and the coach. Across two meals a day that is seconds against minutes, and over a season it is the difference between a diary that stays whole and one that thins out.

Matching the App to Your Protocol

• 16:8 or 14:10, everyday fasting: PlateLens. The presets are built in and both meals log in seconds.
• 18:6, 20:4 or OMAD: PlateLens with a custom window. One big plate is exactly where photo logging pays off.
• Keto plus fasting: PlateLens shows net carbs on every meal; Carb Manager is the keto-only specialist if recipes are your priority.
• Fasting while lifting: PlateLens’s adaptive calorie target adjusts from your intake and weight trend; MacroFactor is the paid alternative built entirely around adaptive targets.
• 5:2 plan with structure handed to you: Lifesum’s templates suit beginners.
• Already on MyFitnessPal: it works, but it is not built around the eating window. Lose It! is a similar story on a smaller budget.

Beyond the Window

Fasting is a tool for a goal, and the goal usually needs more than a timer. PlateLens bundles the rest at no cost:

• A free account with nothing removed. It does not expire, asks for no card and opens the whole app to you, from snapping, speaking, scanning or typing meals to the desktop browser version, coaching, body scans, glucose records, the timer itself and a goal that tunes itself to your results. A daily allowance of AI photo analyses and coach answers comes with it; Premium ($34.99/year) exists only to remove that allowance. No tracker on this board gives fasters a better free plan.
• Coaching from your own log. Ask whether the meals that break your fast are light on protein, and the reply is drawn from the entries you made.
• A body scan for the long game. Fasting changes shape as well as weight. The 3D Body Scan builds a model from 12 phone photos without a depth sensor. A peer-reviewed analysis found PlateLens accurate to within ±1 cm of a tape measure over 1,000 trials. Spin it round, lay a new scan over an old one, or go region by region, and waist changes show up even in weeks the scale stalls.
• Readings next to the window. If you already use a meter or sensor, the blood glucose log stores those readings, entered by hand or pulled from Health Connect or Apple Health, and lines them up with your fasting windows, meals and workouts for context.
• Phone, tablet, laptop. iOS and Android apps plus a full web version, two-way health-platform sync, and your history exportable as JSON at any time.

For the broader picture on losing weight, see our weight loss tracker ranking; for a pure macro focus, the macro tracker leaderboard.

Bottom Line

The fast is easy to time. What decides whether intermittent fasting works for you is whether the meals inside the window get logged honestly, and PlateLens makes that the quickest part of the day while keeping the timer in the same free app. Choose Cronometer if you prefer typing and weighing every ingredient, Carb Manager if you fast on keto and want its recipe library, and MacroFactor if you train with weights and want a paid adaptive engine. For everyone else, start with PlateLens.