Best 21 Days Metabolic Diet Apps

246+ iOS apps curated and reviewed

4.2 avg rating
19 free apps
Updated September 2026

Whether you're new to 21 days metabolic diet or looking for an upgrade, our curated collection of 246+ iOS apps has something for everyone. Each app is reviewed and rated by real users, helping you make an informed decision.

Compare top 21 Days Metabolic Diet Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
121 Days Metabolic Diet21 Days Metabolic Diet$3.993.5★ (2)NoNoJul 2026
2The Fast Metabolism DietThe Fast Metabolism DietFree3.4★ (186)NoNoSep 2026
3Calibrate - Metabolic HealthCalibrate - Metabolic HealthFree4.8★ (5.1K)NoNoSep 2026
4The Good Health Guide IThe Good Health Guide IFree2.0★ (1)NoYesMay 2026
5Metabolism Reset DietMetabolism Reset DietFree3.0★ (2)NoNoMay 2026
6Lumen - Metabolic CoachLumen - Metabolic CoachFree4.6★ (6.5K)NoNoSep 2026
7Levels - Metabolic HealthLevels - Metabolic HealthFree4.7★ (6.7K)NoYesSep 2026
8Stupid Simple Keto Diet AppStupid Simple Keto Diet AppFree4.6★ (8.9K)NoYesSep 2026

Top Picks for 21 Days Metabolic Diet

The Fast Metabolism Diet screenshot 1

This app supports a 28-day diet plan focused on metabolism boosting without calorie counting. It provides comprehensive food lists, customizable meal planning, and progress tracking tools to help users adhere to the diet's phases and achieve weight loss goals.

What We Love

  • 💻 Easy to use
  • 🔍 Helpful for planning meals
  • 🔔 Useful reminders
  • 💪 Effective for weight loss

Room to Improve

  • 🕰️ Inflexible meal times
  • 📋 Incomplete food lists
  • 🔀 Inconsistent with book
  • 🐛 Buggy and outdated
Calibrate - Metabolic Health#3

Calibrate - Metabolic Health by Calibrate Inc.

Weight Loss Results That Last
Worth Considering
💪 Health & Fitness
4.8😞(5.1K ratings)
Free
Calibrate - Metabolic Health screenshot 1
Calibrate - Metabolic Health screenshot 2
Calibrate - Metabolic Health screenshot 3
Calibrate - Metabolic Health screenshot 4
Calibrate - Metabolic Health screenshot 5
Calibrate - Metabolic Health screenshot 6

This app supports a comprehensive weight loss program focused on metabolic health. It provides access to clinician-prescribed medication, personalized video coaching, daily tracking tools, and educational content to foster sustainable lifestyle changes for long-term results.

What We Love

  • 🚀 Easy to use
  • 👍 Helpful coaching and support
  • 💡 Accountability and habit-building
  • 🚀 Responsive app
  • 👍 Comprehensive program
  • 🚀 Effective for weight loss

Room to Improve

  • 🐛 Buggy and glitchy app
  • 🔍 Poor customer service and communication
  • 🔍 Unresponsive support
  • 🔍 Difficult to access medical team
  • 🔍 Medication and insurance issues
  • 🔍 Lack of functionality in app

More 21 Days Metabolic Diet apps to explore

FAQ about 21 Days Metabolic Diet

What are the best 21 days metabolic diet apps for iPhone?
21 Days Metabolic Diet tops our 21 days metabolic diet apps ranking as of September 2026, with a 3.5-star average from 2 App Store ratings, and it's priced at $3.99.
Yes — 19 of the top 21 days metabolic diet apps we rank are free to download, including The Fast Metabolism Diet and Calibrate - Metabolic Health.
21 Days Metabolic Diet has no ads and has no in-app purchases, according to its App Store listing as of September 2026.
We track 246+ 21 days metabolic diet apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
The 21 Days Metabolic Diet app is a guideline designed to accompany users through a 21-day metabolic diet. It provides meal suggestions, recipes, supplement instructions, and tools to track weight loss progress.
The 21 Days Metabolic Diet app is a paid application, available for $3.99. This one-time purchase grants access to all its features.