Comparison

90 Day Challenge vs WorkoutStack

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

WorkoutStack

Features
Read full description

WorkoutStack is a Fast, Bold & Focused gym logger 2,900+ EXERCISE LIBRARY Every exercise comes with animated HD videos, step-by-step instructions, equipment details, and primary and secondary muscle data. Search instantly or filter by muscle group and equipment to find the perfect exercise in seconds. COLOUR-CODED WORKOUTS No more squinting at endless grey lists mid-set. Every exercise in your workout gets its own vivid colour, so you always know where you are at a glance. BUILD YOUR OWN STAT DASHBOARD Design your stat dashboard & add the widgets that are important to you. Analyse specific exercises or data across all your workouts. MUSCLE DISTRIBUTION WorkoutStack calculates which muscles your training actually hits, helping you balance your program and avoid blind spots. WORKS OFFLINE No internet is required to workout. All data is stored 100% privately on your device and iCloud. UNLOCK PREMIUM FEATURES WorkoutStack Premium is available with a monthly or annual subscription. If you choose to purchase WorkoutStack Premium, payment will be charged to your iTunes account, and your account will be charged for renewal 24-hours prior to the end of the current period. Your subscription will automatically renew unless cancelled at least 24hrs before the end of the current period. Subscriptions may be managed by the user and Auto-renewal may be turned off at any time by going to the ‘Manage Subscription’ page after purchase. Any unused portion of the free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Terms of service: https://WorkoutStack.app/terms Privacy policy: https://WorkoutStack.app/privacy

Screenshots

90 Day Challenge3 screens
WorkoutStack4 screens

Verdict

The call

The clearest difference is update cadence: WorkoutStack at weekly against 90 Day Challenge's monthly. 90 Day Challenge's advantage is iOS requirement (15.1 vs 26.2). On price, ads, in-app purchases and device support 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 WorkoutStack sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

90 Day Challenge ships an update monthly, WorkoutStack weekly. The most recent releases landed on September 29, 2026 and October 10, 2026 respectively.

Scorecard2 real differences · 7 level
90 Day Challenge versus WorkoutStack: the parameters behind the verdict, then further details
Parameter90 Day ChallengeWorkoutStack
PriceFreeFree
Rating5.0 (14 ratings) — better—
Number of ratings14 — better—
Update frequencyMonthlyWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better26.2
Further details — not scored
Size87 MB29 MB
Age rating4+4+
DeveloperJohn Kevin BascoNeurondigital Ltd

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
3 purchases

WorkoutStack

Subscriptions2
  • WorkoutStack Monthly Plan3 Days trial$4.991 Month
  • WorkoutStack Yearly Plan3 Days trial$24.991 Year
One-time1
  • WorkoutStack Tracker Lifetime Plan$59.99

Questions

Is 90 Day Challenge free?
90 Day Challenge is free to download, with in-app purchases available.
Is WorkoutStack free?
WorkoutStack is free to download, with in-app purchases available.
Do 90 Day Challenge or WorkoutStack have ads?
Neither 90 Day Challenge nor WorkoutStack shows ads.
Which is updated more often, 90 Day Challenge or WorkoutStack?
90 Day Challenge ships an update monthly, and WorkoutStack weekly. Most recently, 90 Day Challenge was updated on September 29, 2026 and WorkoutStack on October 10, 2026.

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