Comparison

Muscle vs Group Challenge Runner

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

Head to head
About

Muscle

Features
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Muscle Coach is a sophisticated fitness application with a primary focus on muscle growth. It stands out by offering personalized workout programs that are specifically tailored to an individual's goals and needs. Here's an overview of its technical functionalities and advantages: Personalized Workout Programs: The app customizes training programs by adjusting the training volume (number of sets per muscle group) to match your goals and needs, taking into account the data you manually track about your performance and muscle soreness. Advanced Tracking and Analysis: Muscle Coach utilizes your manually tracked data points, including exercise technique ratings, 1 Rep Max (1RM) performance, and volume indexes, to provide insights into the type of progress your muscles are making. This could be growth in size, strength gains, endurance improvements, or signs of under-recovery, all while considering the leading sets prior to each performance assessment. Performance Trend Monitoring: By identifying trends in your performance data, the app can detect when your performance starts to plateau or decline. It then automatically adjusts your training volume downwards, allowing you to recover adequately. This helps you break through plateaus and achieve new personal records in muscle mass and strength. Optimized Training Recommendations: Muscle Coach advises on the most feasible combination of repetitions and weight within your desired rep range and set weight increment for each exercise. It achieves this by calculating every possible combination and selecting the best choice for you, based on the expected strength increase from workout to workout for your experience level. This approach to training and recovery management is designed to optimize muscle growth and strength gains by ensuring that workouts are both effective and sustainable over time.

About

Group Challenge Runner

Build healthy habits with friends by joining or creating shared lifestyle challenges. Track daily progress, stay motivated together, and achieve goals with group accountability and support.

Highlights
  • Create or join shared health challenges
  • Track daily progress and log activities
  • Invite friends and grow your group
  • Customizable challenge rules and durations
  • Sync with Apple Health for automatic tracking
  • Social features for competition and collaboration
  • Photo check-ins for proof of completion
Features
Read full description

Challenge Crew helps you build better habits through every challenge you take on together with your group and friends. Instead of trying to stay consistent alone, you create or join shared health and lifestyle challenges, track progress each day, and keep each other motivated until the finish line. A challenge can be simple (drink more water, walk daily, sleep on time) or structured (multi-task routines with targets and schedules). You can create custom challenges for yourself, your friends, or your group, define rules, set durations, and choose how progress is measured. Invite people easily, grow your group, and turn individual goals into a shared commitment where everyone pushes each other forward. Challenge Crew includes daily logging tools designed for real accountability. Track task completion, add values for measurable goals, and attach photo check-ins when proof matters. Your challenge timeline keeps progress clear, while streak-style momentum helps you stay focused. Every small win becomes visible to your friends and group, so motivation keeps building together over time. For health-focused users, Challenge Crew supports Apple Health integration to automatically sync selected wellness metrics like steps, distance, exercise, and more into relevant challenge tasks. This reduces manual effort and makes health challenges more accurate. You stay in control of permissions while still getting a smoother tracking experience. Social features are at the core of every challenge. See participants, compare progress, view leaderboard-style standings, and celebrate milestones as a group. Whether you’re competing with friends or collaborating together toward a common goal, the app creates positive pressure and encouragement. Missed a day? Your group helps you bounce back. On a streak? Your friends keep you going. Challenge management is flexible and built for real life. Start new attempts, continue improving after setbacks, and adapt to changing routines. Notification support helps you remember tasks, while timezone-aware scheduling keeps daily resets and reminders aligned with your local time. If you want more structure, premium tools expand what you can track and how you run advanced challenges. Safety and control are built in: account-based progress, participant management, reporting flows, and privacy-conscious data handling support a healthier community environment for group challenges. Use Challenge Crew if you want to: Build consistent habits with friends Join a group challenge and stay accountable together Create personal or social wellness challenges Track progress with logs, photos, and health data sync Compete, collaborate, and celebrate results with your group If you’ve ever started strong and lost momentum, Challenge Crew gives you a better way: choose a challenge, do it together, and let your friends and group turn intention into lasting results. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sites.google.com/view/challenge-crew-privacy-policy

Screenshots

Muscle4 screens
Group Challenge Runner4 screens

Verdict

The call

The clearest difference is in-app purchases: Muscle at none against Group Challenge Runner's 3. Muscle also leads on iOS requirement (13.0 vs 15.6). Group Challenge Runner's advantage is update cadence (every 4 days vs fortnightly). On price, ads 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. Group Challenge Runner sells 3 in-app purchases, starting at $2.99 per month. Muscle asks for nothing beyond the download.

UpkeepUpdate frequency

Muscle ships an update fortnightly, Group Challenge Runner every 4 days. The most recent releases landed on May 18, 2026 and September 19, 2026 respectively.

Scorecard3 real differences · 6 level
Muscle versus Group Challenge Runner: the parameters behind the verdict, then further details
ParameterMuscleGroup Challenge Runner
PriceFreeFree
Rating—5.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyFortnightlyEvery 4 days — better
AdsYesYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.6
Further details — not scored
Size186 MB80 MB
Age rating4+12+
DeveloperBullsAI B.V.Nesredin Ahmed

In-app purchases

None

Muscle

No in-app purchases

3 purchases

Group Challenge Runner

Subscriptions3
  • Premium (Monthly) V5$2.991 Month
  • Challenge Crew Premium (Monthly) V4$3.991 Month
  • Challenge Crew Premium (Yearly) V47 Days trial$29.991 Year

Questions

Is Muscle free?
Muscle is free to download, with no in-app purchases.
Is Group Challenge Runner free?
Group Challenge Runner is free to download, with in-app purchases available.
Do Muscle or Group Challenge Runner have ads?
Both Muscle and Group Challenge Runner show ads.
Which is updated more often, Muscle or Group Challenge Runner?
Muscle ships an update fortnightly, and Group Challenge Runner every 4 days. Most recently, Muscle was updated on May 18, 2026 and Group Challenge Runner on September 19, 2026.

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