Best 21 Days Metabolic Diet Apps

220+ iOS apps curated and reviewed

4.6 avg rating
18 free apps
Updated May 2026

Whether you're new to 21 days metabolic diet or looking for an upgrade, our curated collection of 220+ iOS apps has something for everyone. Each app is reviewed and rated by real users, helping you make an informed decision.

Top Picks for 21 Days Metabolic Diet

Prime: Intermittent Fasting#2

Prime: Intermittent Fasting by Oksana Safronenko

The fasting app for women
Strong Contender
💪 Health & Fitness
4.6😐(4.6K ratings)
FreeAdsIn-App Purchases
Prime: Intermittent Fasting screenshot 1
Prime: Intermittent Fasting screenshot 2
Prime: Intermittent Fasting screenshot 3
Prime: Intermittent Fasting screenshot 4
Prime: Intermittent Fasting screenshot 5
Prime: Intermittent Fasting screenshot 6

This app offers a tailored intermittent fasting experience for women, featuring a fasting tracker, weight monitoring, and personalized guidance. It helps users achieve fitness goals, manage weight, and understand the health benefits of fasting with a focus on women's specific needs.

What We Love

  • 👍 Easy to use
  • 🚀 Helpful for weight loss
  • 💡 Useful visual references
  • 👍 Responsive customer support

Room to Improve

  • 💰 Expensive subscription
  • 🐛 Buggy and laggy
  • 🔍 Lacking in-depth features
BodyFast: Intermittent Fasting#3

BodyFast: Intermittent Fasting by BodyFast GmbH

Weight Loss Diet, Meal Tracker
Worth Considering
💪 Health & Fitness
4.7😊(144K ratings)
FreeAdsIn-App Purchases
BodyFast: Intermittent Fasting screenshot 1
BodyFast: Intermittent Fasting screenshot 2
BodyFast: Intermittent Fasting screenshot 3
BodyFast: Intermittent Fasting screenshot 4
BodyFast: Intermittent Fasting screenshot 5
BodyFast: Intermittent Fasting screenshot 6

This app guides users through intermittent fasting to achieve weight loss, improve health, and boost energy. It offers personalized plans, daily coaching, recipes, and tools like a water tracker and weight log. Users can choose from various fasting plans and track their progress towards their health goals.

What We Love

  • 👍 Easy to use
  • 🚀 Helpful for weight loss
  • 💪 Effective for fasting
  • 🔔 Useful reminders and notifications

Room to Improve

  • 🤔 Confusing to adjust fasting times
  • 💰 Expensive subscription
  • 🔒 Difficult to cancel subscription

More 21 Days Metabolic Diet apps to explore

4
Carbon - Macro Coach & Tracker
Carbon - Macro Coach & Tracker
Carbon - Macro Coach & Tracker
Calories, Nutrition, & Diet
Free

This app provides personalized nutrition plans for weight loss, muscle gain, or maintenance. It adapts your plan as you progress and offers a comprehensive food tracker with a large database and barcode scanner. It supports various diet preferences and allows for custom meal planning.

Personalized nutrition plansAdaptive plan adjustmentsComprehensive food logging
💪 Health & Fitness
(7.6K)
free with in-app purchases
5
Healthi: Weight Loss, Diet App
Healthi: Weight Loss, Diet App
Healthi: Weight Loss, Diet App
Track Food GLP-1 Macro Calorie
Free

This app helps users achieve weight loss through personalized plans, easy food tracking, and a supportive community. It offers features like barcode scanning, recipe building, and integration with health devices. A premium option also combines medication support for enhanced results.

Personalized weight loss plansEasy food tracking (barcode scanner, search)Recipe builder
💪 Health & Fitness
(90K)
free with in-app purchases
6
Lumen - Metabolic Coach
Lumen - Metabolic Coach
Lumen - Metabolic Coach
Hack your metabolism
Free

Gain control of your metabolism with real-time insights and personalized nutrition plans. This app helps you understand if your body is burning fats or carbs, offering guidance on what and when to eat for weight loss and a healthier lifestyle.

Real-time metabolic insightsPersonalized daily nutrition plansLifestyle recommendations
💪 Health & Fitness
(6.5K)
free with in-app purchases
7
FastEasy: Intermittent Fasting
FastEasy: Intermittent Fasting
FastEasy: Intermittent Fasting
Simple Weight Loss & Tracker
Free

This app guides users through intermittent fasting to achieve weight loss and improve health. It offers customizable fasting plans, a timer, water tracking, and personalized recipes. Track your progress and gain insights into your body's changes.

Customizable fasting plansFasting timer and remindersWater intake tracker
💪 Health & Fitness
(79K)
free with in-app purchases
8
Mayo Clinic Diet
Mayo Clinic Diet
Mayo Clinic Diet
Weight loss for life
Free

This app supports a comprehensive whole-health weight loss program developed by the Mayo Clinic. It offers flexible meal plans, easy recipes, and tools to track food intake, monitor progress, and build healthy habits. Exercise plans are also included to support your journey.

Flexible meal plansEasy-to-prepare recipesDiet Score
💪 Health & Fitness
(3.4K)
subscription
9
Unimeal: Fasting and Diet
Unimeal: Fasting and Diet
Unimeal: Fasting and Diet
Simple Weight Loss & Tracker
Free

Achieve your weight loss goals with personalized meal plans, intermittent fasting schedules, and easy-to-use calorie and weight tracking. Utilize an AI scanner for effortless food logging and access workouts and hydration reminders to support your journey.

Intermittent fasting customizationPersonalized meal plansAI food and nutrition scanner
💪 Health & Fitness
(13K)
free with in-app purchases
10
DietBet: Lose Weight & Win!
DietBet: Lose Weight & Win!
DietBet: Lose Weight & Win!
Join over 1,000,000 players!
Free

Achieve your weight loss goals by joining supportive communities and participating in games hosted by experts. Make a pledge, track your progress, and win money when you reach your targets. This app helps build lasting healthy habits.

Weight loss goal settingCommunity supportExpert-hosted games
💪 Health & Fitness
(21K)
free with in-app purchases
11
Stupid Simple Keto Diet App
Stupid Simple Keto Diet App
Stupid Simple Keto Diet App
Low Carb Diet & Macros Manager
Free

This app helps you track carbs and calories to achieve weight loss and maintain a ketogenic lifestyle. It offers easy food logging, progress tracking, and support for custom foods and fasting. Certified diet coaches are also available.

Visual carb and calorie loggingBarcode scanner for food entryFasting support
💪 Health & Fitness
(8.9K)
free with in-app purchases
12
My Challenge: Diet Plans
My Challenge: Diet Plans
My Challenge: Diet Plans
by KETO DIETS UAB
Free

This app offers a personalized low-carb diet plan designed by nutritionists and behavioral scientists. It provides meal planning with over 10,000 recipes, macronutrient tracking, progress monitoring, and expert guidance to help you achieve weight loss and improve overall health.

Personalized low-carb diet plans10,000+ carb-free recipesMacronutrient tracking
💪 Health & Fitness
(3.8K)
free with in-app purchases
13
Fooducate: Nutrition Coach
Fooducate: Nutrition Coach
Fooducate: Nutrition Coach
Calorie Counter & Diet Tracker
Free

This app helps millions track food intake, exercise, and sleep to improve health and achieve weight loss goals. It analyzes food quality, counts macros, and offers personalized dietary advice for various health needs. Scan barcodes to uncover hidden ingredients and discover healthier alternatives.

Log food intake and exerciseAnalyze calorie quality and macrosScan product barcodes for nutrition grades
💪 Health & Fitness
(77K)
free with in-app purchases
14
RP Diet Coach & Planner
RP Diet Coach & Planner
RP Diet Coach & Planner
Calories, Macros, Fat Loss
Free

This app helps you achieve your fitness goals by providing personalized calorie and macro tracking, meal timing guidance, and flexible scheduling. It adapts to your progress with weekly reviews and offers a vast food database with barcode and AI nutrition label scanning.

Personalized calories and macrosMeal timing guidanceRaw vs. cooked food tracking
💪 Health & Fitness
(12K)
subscription
15
no.Diet
no.Diet
no.Diet
Mediterranean Weight Loss Diet
Free

This app offers a personalized nutrition and lifestyle plan inspired by Mediterranean recipes to support weight loss, boost energy, and improve overall health. It focuses on building sustainable habits through meal tracking, mindful movement, and stress reduction techniques.

Personalized meal plansMediterranean recipe inspirationHabit tracking (meals, water, movement)
💪 Health & Fitness
(2.8K)
free with in-app purchases
16
Calorie Counter PRO MyNetDiary
Calorie Counter PRO MyNetDiary
Calorie Counter PRO MyNetDiary
Food Nutrition Fasting Tracker
$3.99

Easily track calories, food intake, and macronutrients with a powerful barcode scanner and AI meal logging. Offers personalized diet plans and detailed nutrition breakdowns to help users achieve their health goals.

Barcode scanner for fast loggingAI Meal Scan for instant food entryPersonalized diet and meal plans
💪 Health & Fitness
(14K)
freemium
17
Formula - weight loss diet app
Formula - weight loss diet app
Formula - weight loss diet app
Anti-Inflammatory, Cortisol
Free

This app guides you through various specialized diets like Carnivore, Mediterranean, Anti-Inflammatory, and Cortisol Detox. It offers recipe libraries, meal tracking via voice or barcode, and expert support to help you achieve your health goals.

Automatic Nutrient CalculatorVoice and Barcode Meal LoggingExtensive Recipe Library
💪 Health & Fitness
(32K)
free with in-app purchases
18
eMeals - Healthy Meal Plans
eMeals - Healthy Meal Plans
eMeals - Healthy Meal Plans
Meal Planner & Grocery List
Free

Simplify healthy meal planning for busy families with customizable weekly plans and automatic grocery list generation. Connects to online grocery partners for delivery or pickup, or organizes lists for in-store shopping.

Weekly meal plansCustomizable grocery listsOnline grocery delivery/pickup integration
🍔 Food & Drink
(4)
subscription
19
Fasting + Intermittent Fasting
Fasting + Intermittent Fasting
Fasting + Intermittent Fasting
Fasting Tracker - Lose Weight
Free

This app helps users achieve weight loss and improve metabolic health through intermittent fasting. It offers personalized plans, progress tracking, and coaching without dietary restrictions.

Advanced fasting and intermittent fasting trackerOver 15 free intermittent fasting plansCustomizable fasting plans
💪 Health & Fitness
(6.6K)
free with in-app purchases
20
Fasting For Weight Loss App
Fasting For Weight Loss App
Fasting For Weight Loss App
Customized Fasting Plans
Free

This app helps you lose weight and improve health through customized intermittent fasting plans. It offers AI-powered food scanning, intelligent dietary advice, and progress tracking to support your goals without restrictive diets.

AI food scannerCustomized intermittent fasting plansNutrition and hydration tracking
💪 Health & Fitness
(6.3K)
free with in-app purchases