90 Day Challenge vs Relentless
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
90 Day Challenge
This app provides personalized 90-day fitness programs tailored to your goals, fitness level, and preferred training style. Track your progress with detailed metrics, view body changes, and stay motivated with streaks and badges. You can also challenge friends to join your fitness journey.
- Personalized 90-day workout programs
- In-app progress tracking (weight, reps, PRs)
- Monthly strength tests
- Progress picture tool
- Daily streaks and achievement badges
- Challenge others feature
- Diet calculator
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The 90 Day Challenge App is the perfect workout tool in your pocket and provides you with everything you need to start your own fitness journey. Get your own 90 day programs based on your goals, level, and training style. Stan Browney has done many 90-day transformations with family, friends, and strangers. After seeing their results, so many people requested to help them with their fitness journey. Because it would be impossible to guide everybody personally, we designed this app. Now, you will be able to have your own 90 Day Transformation! Start your 7-Day Free Trial now. OVER 45 TAILORED 90-DAY PROGRAMS Check out the 90 Day Challenge App and pick from over 45 awesome workout programs made just for you! Whether you like to exercise at home, hit the gym, or get moving outside, there’s something for everyone. You can choose to lift weights, use machines, do bodyweight exercises, or mix it up. Set your own goals to build muscle, get stronger, shed pounds, or bulk up. It’s super easy and fun, great for both beginners and experienced people. TRACK YOUR PROGRESS The 90 Day Challenge App has a complete in-app tracking system that allows you to track your weight, reps, personal records, everything! You can easily see your progress for every exercise to know you’re on track to reach your goals. For every 90 day program, you will have monthly strength tests to see the progress you make each month. Additionally, there are fun weekly challenges to keep you active but also help you to see yourself get stronger over time! SEE YOUR BODY CHANGING Within the 90 Day Challenge App, you can take progress pictures with the in-app progress picture tool. You can also create your own “Before and After” that you can share with others. Besides visual changes, you will be able to track your weight, and see your weight changing over time. ALWAYS STAY MOTIVATED Keep your fitness journey fun and rewarding with our daily streaks and achievement badges! Each day you log a workout, you’ll keep your streak going—making it exciting to see how long you can keep it up. With these streaks and badges, you’ll always have a reason to stay motivated and never feel like giving up. As you move along, you'll unlock cool badges for different milestones and challenges. These badges are more than just fun—they celebrate the progress you’re making towards your health and fitness goals. Whether it’s finishing a 90-day challenge, hitting a new personal best, or maintaining a routine of working out three times a week, each badge highlights your enjoyment and commitment in a super fun and easy way. CHALLENGE OTHERS Working out can even be more fun when you do it together with a friend. That is why the 90 Day Challenge App has a built-in feature where you can challenge others to join the exact program that you have. This way you can workout together and keep each other accountable to keep hitting your workouts! CALCULATOR The 90 Day Challenge also has you covered when it comes to diet! With the in-app calorie calculator you can calculate your calorie needs for losing weight, maintaining weight, or gaining weight. You can also determine your macronutrient split and form your own diet goals. RECIPES Within the app, there is an entire library of recipes that are both healthy and delicious that will help you to build muscle and lose fat! These recipes are explained in great detail including the ingredient list and the cooking instructions. LEARN EVERYTHING ABOUT FOOD AND FITNESS You will get access to a library filled with high quality videos explaining everything about working out, recovery, losing or gaining weight, tracking calories, and more! DOWNLOAD NOW FOR A 7-DAY FREE TRIAL Start your own fitness journey with the 90 Day Challenge App. Download now and get your first 7 days for free. Start your 90 Day Challenge today! By creating an account you agree to the Terms of Service which can be found here: https://the90dc.com/terms-of-service
Relentless
This app helps you track workouts, log nutrition, and monitor progress towards your fitness goals. It features an exercise library, customizable routines, calorie counting, and progress photos to keep you motivated.
- Workout logging with exercise library
- Customizable workout programs
- Nutrition and calorie tracking
- Progress photos and body measurements
- Social challenges and friend tracking
- Workout streaks and accountability
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Relentless is your all‑in‑one fitness companion for workouts, nutrition, and progress tracking. WORKOUT TRACKING • Log exercises, sets, reps, and weight with a simple interface • Large exercise library with video demos • Create and follow workout programs and routines • Rest timer and workout history • Track volume and progress over time NUTRITION & CALORIES • Set daily calorie and macro goals • Log meals by breakfast, lunch, dinner, and snacks • Search a food database or add custom foods • Scan meals with AI for quick logging PROGRESS & MEASUREMENTS • Progress photos to see your transformation • Body measurements (weight, body fat, waist, arms, etc.) • Custom measurement types • Charts and trends for your data STAY MOTIVATED • Workout streaks • Challenges with friends • Find and follow friends in the app • Share progress and stay accountable Terms of Use: https://StudySmarter1.github.io/relentless-legal/terms.html Relentless helps you stay consistent and reach your fitness goals.
Screenshots
Verdict
The clearest difference is ads: Relentless at none against 90 Day Challenge's shown. 90 Day Challenge's advantage is review sentiment (64% vs 33%) and ratings volume (5K vs 29). On price, rating, 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
Both are free to download. 90 Day Challenge sells 37 in-app purchases, starting at $2.99 per 7 days and Relentless sells 2 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.7 for 90 Day Challenge against 4.7 for Relentless. That said, the two scores are not equally well evidenced: 90 Day Challenge has 5K ratings behind it against 29, so its average is the more settled of the two. Written reviews are what separate them: 64% of 90 Day Challenge's written reviews are positive against 33% of Relentless's.
90 Day Challenge ships an update every 5 days, Relentless every 2 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | 90 Day Challenge | Relentless |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (5K ratings) — better | 4.7 (29 ratings) |
| Positive reviews | 64.0% of reviews — better | 33.3% of reviews |
| Number of ratings | 5K — better | 29 |
| Update frequency | Every 5 days — better | Every 2 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 246 MB | 37 MB |
| Age rating | 4+ | 12+ |
| Developer | Browney B.V. | Nithya Thomas |
Customer experience
90 Day Challenge
Relentless
Bugs and requests
90 Day Challenge
Reported bugs
4 issues- Black screen issue after login
- Inability to complete workouts or log progress
- Inconsistent app performance across devices
- Syncing issues between app and user accounts
Requested features
4 requests- More home workout options without equipment
- Ability to adjust workout schedules and rest days
- Improved video quality and playback stability
- Better integration with fitness trackers and smartwatches
Relentless
Not enough reviews yet to summarise bugs or requests.
In-app purchases
90 Day Challenge
- WEEKLY7 Days trial$2.997 Days
- Weekly1 Month trial$5.007 Days
- Weekly$5.007 Days
Show 17 moreShow fewer
- WEEKLY7 Days trial$8.997 Days
- MONTHLY7 Days trial$9.991 Month
- Monthly1 Month trial$15.001 Month
- Monthly$15.001 Month
- MONTHLY7 Days trial$21.991 Month
- 90 DAYS7 Days trial$27.993 Months
- 90 DAYS7 Days trial$39.003 Months
- 90 DAYS$39.003 Months
- YEARLY$39.001 Year
- 90 DAYS7 Days trial$41.493 Months
- 90 DAYS7 Days trial$44.003 Months
- 90 DAYS7 Days trial$49.003 Months
- Yearly$59.001 Year
- YEARLY7 Days trial$89.001 Year
- YEARLY7 Days trial$99.001 Year
- YEARLY7 Days trial$99.991 Year
- Yearly$119.001 Year
- 30-Day Challenge$29.00
- 90 Day Shred Pass - 2026$49.00
- Strength & Size at Home$69.00
Show 14 moreShow fewer
- JC’s Fat Loss Program$69.00
- The Bodybuilder Shred$69.00
- Lean & Strong at Home$69.00
- The Hybrid Shred$69.00
- The Ultimate Shred Program$69.00
- Hybrid Strength & Size$69.00
- The Hybrid Bulk$69.00
- Lean Hybrid Strength$69.00
- The Home Shred Program$69.00
- Strength & Muscle Bulk$69.00
- Strength & Muscle Shred$69.00
- Fat Free Runner Program$69.00
- The Powerbuilder Plan$69.00
- Hybrid Strength & Muscle$69.00
Relentless
- Relentless Premium Monthly$12.991 Month
- Relentless Premium Yearly$29.991 Year









