Comparison

Simple Calorie Tracker vs LeanFast

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Simple Calorie Tracker

This app uses AI to help you track your calorie and macro intake. It offers features like barcode scanning, food search, and weight tracking. It also syncs with health platforms and provides personalized insights based on your data.

Highlights
  • AI meal photo scan
  • Barcode scanning
  • Food database search
  • Manual macro logging
  • Weight tracking with trend line
  • Apple Health & Google Health sync
  • Home and Lock Screen widgets
Features
Read full description

Calvin is a simple calorie, macro, fitness, and health tracker that keeps the basics free. Track food, calories, macros, weight, workouts, steps, sleep, recovery, and health trends in one place — without ads or requiring an account. Barcode scanning and food search are free. Most calorie trackers moved them behind a subscription. Calvin does not. FREE, AND STAYING FREE • Barcode scanning for packaged foods • Food search with USDA Branded and Open Food Facts • Calorie, macro, protein, carb, fat, fiber, sugar, and sodium tracking • Fast manual logging, common foods, recents, usuals, one-tap repeat logging, and copy yesterday's log • Custom recipes • Weight tracking with a smoothed trend line and adaptive maintenance calories based on your real weight trend • Fitness tracking for workouts, steps, distance, and active time • Apple Health integration and automatic compatible smart-scale weigh-ins • Body fat and lean mass trends when available • Google Health connection • Sleep, HRV, resting heart rate, personal baselines, and a daily recovery score • Weekly and monthly recaps, plus year in review • Home Screen and Lock Screen widgets • Apple Watch app and complication • Siri, Shortcuts, and CSV export FAST FOOD LOGGING Start typing a food and Calvin surfaces foods you've logged before. One tap logs it again. The built-in pantry makes everyday staples like eggs, apples, rice, and chicken quick to add. CALORIES & MACROS, YOUR WAY Calories stay front and center while macros and nutrients are there when you want them. Choose which metrics appear throughout the app. Turn calorie numbers off for a simpler on-track-or-over view. FITNESS, WEIGHT & MAINTENANCE CALORIES Keep workouts and daily activity alongside nutrition. Track weight with a smoothed trend line, and let Calvin adapt your maintenance-calorie estimate over time based on your real weight trend. HEALTH & RECOVERY Bring together sleep, HRV, resting heart rate, breathing rate, activity, and other available health signals. Calvin compares supported metrics with your recent baseline. Your daily recovery score summarizes how you're doing and highlights the signals that changed. APPLE HEALTH & SMART SCALES Connect Apple Health to bring supported fitness and health data into Calvin. Compatible smart-scale weigh-ins can appear automatically, including body fat and lean mass when your scale provides them. Connections are optional. APPLE WATCH Check calories remaining, your chosen macros, and recovery from the Calvin Apple Watch app and complication. NO ACCOUNT NEEDED. NO ADS. Use Calvin without creating an account. Your food log lives on your device, not on a Calvin server. Connecting Apple or Google is optional and does not upload or restore your food log. WEEKLY, MONTHLY & YEARLY TRENDS See patterns across nutrition and health data with weekly and monthly recaps and a year in review. CALVIN PLUS — AI MEAL SCANNER Calvin Plus adds AI-powered meal photo scanning and deeper insights. Take a photo and Calvin identifies foods on your plate and estimates their nutrition. It can account for things a photo may miss, like cooking oil, and asks before keeping uncertain additions. Adjust portions, add a missing item, or make a correction without starting over. Monthly and annual plans are available in your local App Store currency with a 3-day free trial. Barcode scanning, food search, calorie and macro tracking, fitness, weight, health features, and the other core features above remain free. SIMPLE BY DESIGN Calvin helps you understand nutrition, fitness, weight, and health without turning every meal into homework. Track what matters. Ignore what doesn't. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://calvinhealth.com/privacy

About

LeanFast

Features
Read full description

Plan, track and keep up your intermittent fasting, with water, weight and food in one place. LeanFast shapes a plan around your body and your week, shows Fasting or Eating at a glance, logs your fasts, water, meals and weigh-ins, and suggests recipes for your eating window. No ads, no trackers, AI that stays on your device, and safety built in. Free to start. WHY LEANFAST • No ads, ever. No trackers, and your data is never sold. • Private AI: with Apple Intelligence, Coach answers your questions on your device, with the sources behind each answer, and Lens reads labels and barcodes there too. Smart Lens is optional, runs in Europe and doesn't keep your photo. • Safety first: a short health check adapts your plan, and "I don't feel well" stops your fast and calls the local emergency number in 234 countries and territories. • Backed by science: every source is listed in Settings › Health sources. • Accessible: VoiceOver, Dynamic Type at every size and Reduce Motion. • Everywhere: iPhone, iPhone Duo, iPad and Apple Watch. ALWAYS OBVIOUS One big word tells you where you are: Fasting, Eating or Not fasting, on Today, your Lock Screen, widgets and Apple Watch. Tap Start fast in the evening reminder, or turn on Autopilot: every planned fast starts when your eating window closes and ends when the next one opens. PLANS AS UNIQUE AS YOU LeanFast recommends Spark (from 12:12), Flow (the classic 16:8) or Blaze (longer fasts) and eases you in over four weeks. Shape every day on a 24-hour dial: brunch on Sunday, a late dinner on Friday, rest days when you need them. A TIMER YOU CAN GLANCE AT Follow your body stage by stage, with a new explanation at each milestone, on your Lock Screen, in the Dynamic Island, widgets and Control Center. Siri can start your fast, and the Watch app keeps going when your iPhone is out of range. MOTIVATION THAT'S GOOD FOR YOU Weekly challenges and levels reward consistency, water and logging, never longer fasts. A sick day never breaks your streak, and friendly water reminders let you log a glass from the notification. LEANFAST PRISM • Lens: a Fast-Friendly grade, nutrition facts and healthier swaps for any meal, label or barcode. • Kitchen: 96 photographed recipes to break your fast, with cook mode, timers and a shopping list. • Coach: a weekly review, answers to your questions and a nudge when your plan should change. • Deep insights: weight trend, goal forecast, consistency calendar and time in each stage. • Ring themes, app icons, progress photos, Streak Shields and custom fasts. WORKS WITH APPLE HEALTH Fill in your profile from Apple Health, import weigh-ins from your smart scale and save the weight and water you log. You choose what's shared. PRICING Free to use, no account needed. Prism is available monthly or yearly (each with a 7-day free trial) or as a one-time lifetime purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period; manage them in your Apple Account settings. LeanFast provides general wellness information and is not a medical device or a substitute for professional medical advice. Terms: https://lean-fast.com/terms Privacy: https://lean-fast.com/privacy

Screenshots

Simple Calorie Tracker4 screens
LeanFast4 screens

Verdict

The call

The clearest difference is iOS requirement: Simple Calorie Tracker at 18.0 against LeanFast's 26.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Simple Calorie Tracker sells 2 in-app purchases, starting at $9.99 per month and LeanFast sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Simple Calorie Tracker ships an update every 2 days, LeanFast every 4 days. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

Scorecard1 real difference · 8 level
Simple Calorie Tracker versus LeanFast: the parameters behind the verdict, then further details
ParameterSimple Calorie TrackerLeanFast
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 2 days — betterEvery 4 days
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, Apple WatchiPhone, iPad, Apple Watch — better
Requires iOS18.0 — better26.1
Further details — not scored
Size18 MB47 MB
Age rating12+12+
DeveloperKevin Miguel Estrada GarciaHajer Trabelsi

In-app purchases

2 purchases

Simple Calorie Tracker

Subscriptions2
  • Calvin Plus3 Days trial$9.991 Month
  • Calvin Plus Annual3 Days trial$49.991 Year
3 purchases

LeanFast

Subscriptions2
  • Prism Monthly7 Days trial$3.991 Month
  • Prism Yearly7 Days trial$29.991 Year
One-time1
  • Prism Lifetime$49.99

Questions

Is Simple Calorie Tracker free?
Simple Calorie Tracker is free to download, with in-app purchases available.
Is LeanFast free?
LeanFast is free to download, with in-app purchases available.
Do Simple Calorie Tracker or LeanFast have ads?
Neither Simple Calorie Tracker nor LeanFast shows ads.
Which is updated more often, Simple Calorie Tracker or LeanFast?
Simple Calorie Tracker ships an update every 2 days, and LeanFast every 4 days. Most recently, Simple Calorie Tracker was updated on October 24, 2026 and LeanFast on October 31, 2026.

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