Comparison

90 Day Challenge vs MainGain

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

Head to head
About

90 Day Challenge

Build lasting habits with a personalized 90-day program tailored to your lifestyle and goals. This offline-first app offers custom tasks for sleep, water, exercise, and more, with progressive challenges and visual progress tracking.

Highlights
  • Personalized 90-day habit program
  • Customized daily tasks
  • Progressive difficulty
  • Offline functionality
  • Visual progress tracking
  • Focus on sleep, water, exercise, and screen time
Read full description

Science shows it takes 90 days to form lasting habits. Resettr harnesses this research to deliver a personalized habit-building program designed specifically for your lifestyle and goals. No more generic advice or one-size-fits-all solutions – just a tailored 90-day journey to the life you want. YOUR PERSONALIZED LIFE RESET Answer a few questions about your current habits and select your primary goal. Our intelligent algorithm instantly creates your custom 90-day program targeting key areas: Sleep, Water, Exercise, Mind, Screen Time, and more. Each task is specifically chosen to help you progress steadily toward meaningful change. WORKS ANYWHERE, ANYTIME Unlike other habit apps that require constant internet connectivity, Resettr works completely offline after subscription. Perfect for travel, remote areas, or simply saving your data. Your entire program is stored locally on your device for seamless access whenever you need it. KEY FEATURES • Personalized 90-Day Program: Tailored daily tasks based on your questionnaire responses • Progressive Challenge: Task difficulty increases gradually as your habits strengthen • Progress Tracking: Monitor your journey with visual progress indicators • Complete Offline Access: Full functionality without internet after subscription WHY 90 DAYS? Research found that it takes an average of 90 days for a new behavior to become automatic. Resettr is built on this science, providing the perfect timeframe to transform occasional actions into lifelong habits. AREAS OF IMPROVEMENT: • Sleep quality and routines • Hydration habits • Exercise consistency • Mental wellness practices • Screen time management • Personal hygiene • And more! Start your transformation today with Resettr. Small, consistent changes lead to remarkable results – and your new life is just 90 days away. Privacy First: • 100% offline - all data stays on your device • No account needed • No cloud sync • Your data is yours only. SUBSCRIPTION INFORMATION Full access to all features is only available in the Resettr paid subscription plan (Monthly/Yearly) When you purchase a subscription, please be aware of the following: - Payment will be charged to Apple Account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's App Store Account Settings after purchase Terms of service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy: https://doc-hosting.flycricket.io/resettr-privacy-policy/0980682e-a5f9-4959-9ce7-966ea9f352fa/privacy

About

MainGain

This app helps you accurately determine your daily calorie needs for weight maintenance using a 14-day tracking method. It removes guesswork by analyzing your actual food intake and weight changes, providing personalized results for fitness goals like bulking or cutting.

Highlights
  • 14-day tracking for accurate maintenance calories
  • Meal and weight tracking
  • Barcode scanning for food entry
  • Product search for food items
  • Data export (CSV/JSON)
  • Privacy-first, data stays on device
Features
Read full description

MainGain - Your Maintenance Calculator Finding your maintenance calories shouldn't be complicated. MainGain removes the guesswork with a scientifically-proven 14-day tracking approach. WHAT IS MAINTENANCE? Your maintenance calories are the exact amount you need to eat to maintain your current weight. It's the foundation for any fitness goal - whether you want to bulk, cut, or recomp. WHY 14 DAYS? Your daily weight fluctuates 2-4 lbs from water, sodium, and meal timing. Traditional calculators guess based on averages. MainGain uses your actual data to find YOUR unique maintenance calories. THE SIMPLE PROCESS • Track your meals (calories & protein minimum) • Weigh yourself each morning • Let the science work for 14 days • Get your personalized maintenance calories FEATURES • Clean, distraction-free tracking • Barcode scanning for quick entry • Product search for items without barcodes • Export your data anytime (CSV/JSON) • No ads, no social features, no BS • Privacy-first: all data stays on your device PERFECT FOR • Finding your true maintenance calories • Planning bulks and cuts with precision • Anyone tired of generic TDEE calculators • People who want accurate, personalized results HOW IT WORKS MainGain uses the relationship between your calorie intake and weight changes to calculate your exact maintenance. If you ate 2,400 calories daily and lost 1 lb over 14 days, your maintenance is actually 2,650. No more guessing. PREMIUM FEATURES Try all features free for 7 days, then unlock forever for $4.99: • Barcode scanner with camera • Search millions of food products • Export data as CSV or JSON • Manual barcode entry PRIVACY PROMISE MainGain is designed with your privacy in mind. All data stays on your device. No account required, no cloud sync, no tracking. Your health data is yours alone. Start your 14-day discovery today and never guess your calories again.

Screenshots

90 Day Challenge3 screens
MainGain4 screens

Verdict

The call

The clearest difference is rating: MainGain at 5.0 against 90 Day Challenge's 4.8. 90 Day Challenge's advantage is ratings volume (16 vs 2) and device support (3 vs 1). On price, ads, in-app purchases and monetization model 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. 90 Day Challenge sells 5 in-app purchases, starting at $1.99 per month and MainGain sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

MainGain holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: 90 Day Challenge has 16 ratings behind it against 2, so its average is the more settled of the two.

Scorecard4 real differences · 5 level
90 Day Challenge versus MainGain: the parameters behind the verdict, then further details
Parameter90 Day ChallengeMainGain
PriceFreeFree
Rating4.8 (16 ratings)5.0 (2 ratings) — better
Number of ratings16 — better2
Update frequencyMonthly—
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better17.0
Further details — not scored
Size87 MB1 MB
Age rating4+4+
DeveloperJohn Kevin BascoMaxwell Isley

In-app purchases

5 purchases

90 Day Challenge

Subscriptions5
  • monthly$1.991 Month
  • Yearly - Bonus$4.491 Year
  • Monthly Pro$7.991 Month
Show 2 more
  • yearly$14.991 Year
  • Yearly Pro$29.991 Year
1 purchases

MainGain

One-time1
  • MainGain Pro$4.99

Questions

Is 90 Day Challenge free?
90 Day Challenge is free to download, with in-app purchases available.
Is MainGain free?
MainGain is free to download, with in-app purchases available.
Which has better reviews, 90 Day Challenge or MainGain?
MainGain is rated higher. 90 Day Challenge averages 4.8 out of 5 from 16 ratings, while MainGain averages 5.0 from 2 ratings.
Do 90 Day Challenge or MainGain have ads?
Neither 90 Day Challenge nor MainGain shows ads.

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