Comparison

Plank Challenge vs 100 Sit

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

Head to head
About

Plank Challenge

This app guides you through a 5-week program to build up to a 4-minute plank. It requires no equipment and can be done in just 4 minutes daily, with rest days incorporated for recovery. It also includes a bonus push-up progression.

Highlights
  • 5-week structured plank program
  • Progressive push-up training
  • Daily workout instructions
  • Progress tracking
  • Apple Music integration
  • Distraction-free interface
Features
Read full description

Hold a 4-minute plank in just 5 weeks – no gym, no equipment, only a few minutes a day. Plank Challenge is a proven, progressive program that takes you from beginner to a 4-minute plank, step by step. HOW IT WORKS - Train 4 days, rest 3 – your muscles get time to recover and grow stronger - Progressive plan designed to prevent injury - Clear daily instructions and progress tracking - Bonus: build from 1 to 100 push-ups at your own pace WHY PLANKS? Planks strengthen your abs, back and arms at the same time. They're one of the most effective bodyweight exercises for core stability and overall strength. FEATURES - 5-week structured program - Push-up challenge from 1 to 100 - Progress tracking - Apple Music integration – your music resumes automatically after each workout - Simple, distraction-free design FOR BEGINNERS AND RETURNERS Whether you're brand new or getting back into shape, the program meets you where you are. PRO - Ad-free - 4 premium themes - Trophy Room - Advanced statistics - Lifetime access – pay once Join 127,000+ people who have built a stronger core with Plank Challenge. Download now and see what you're capable of.

About

100 Sit

This app acts as a personal fitness coach, using your device's motion sensor to automatically count sit-ups. It provides a structured training plan, voice coaching, and motivational features like leaderboards and streaks to help you achieve your core strength and abs goals.

Highlights
  • Automatic sit-up counting via motion sensor
  • Voice coaching for feedback
  • Global and friend leaderboards
  • Personalized training plans
  • Goal setting and reminders
  • Workout streaks tracking
  • Integration with Apple Health
Features
Read full description

100 Sit-Ups Six Pack Trainer transforms your iPhone/iPad into your very own FITNESS COACH. Sit-ups are among the most popular strength exercises for a flat belly and ripped abs for a reason. They’re highly effective and a big step towards your sixpack. Seize the moment, maximize your motivation and kick off your journey to perfect abs! This innovative app leverages the power of technology to automatically detect your sit-ups using the motion sensor on your device. It diligently keeps track of your sit-up repetitions, assists you in reaching new personal milestones, and provides essential support for achieving your fitness goals. Moreover, a comprehensive training regimen and dynamic voice coaching are seamlessly integrated. With this app, you have the flexibility to enhance your core strength anytime, anywhere. Embark on a journey guided by a meticulously crafted training plan that adapts to your fitness level and aspirations. You can opt for one of three intensity levels, progressing from 0 to 100 Sit-Ups. To foster your enthusiasm, a captivating leaderboard awaits, allowing you to measure your progress against friends and even individuals worldwide. Should you desire to unite with colleagues, you can effortlessly establish a distinct leaderboard exclusively for your group. Ultimately, we are committed to your success. This is why we introduce a user-friendly goal setting feature and the motivating concept of streaks. Set daily, monthly, and yearly objectives and receive timely reminders. By engaging in a workout each day, you cultivate a streak and unlock additional motivation! PRO TIP: As little as 3-5 minutes of daily sit-up training will fortify your cardiovascular fitness, enhance endurance, amplify upper body strength, and sculpt your muscles over time. Witness your sit-up prowess skyrocket! APP FEATURES: - Counts completed Sit-Ups by the proximity sensor or your nose - Voice coach for feedback - Leaderboard with friends and global leaderboard. Add a filter to the leaderboard to compare to your peer - Live Leaderboard - Set personal goals (Daily, Monthly, Yearly) and get reminders. - Quick statistics on the main screen - Calendar view - Scientifically developed training plan. Choose your Plan level 1-2-3 - Streaks - tracks the number of days in a row you’ve completed a workout (works in combination with the 100 Push-Ups app) - Statistics in your profile. See your weekly, monthly, and yearly progress in a chart - Personal Record - Show & shine by sharing your personal record on social media - Achieve new levels by doing more push-ups - Connect to Apple Health - Create groups and add your co-workers, families, etc., to the leaderboard - Leaderboard filters (Age, Sex, Country, etc.) - Share your success on Instagram, Snap, TikTok, and other social media platforms SUPPORT Our goal is to build the best fitness apps in the world. You can help us by reporting bugs and requesting features via email: support@foxyfitness.app TERMS & PRIVACY https://foxyfitness.app/privacy-policy https://foxyfitness.app/terms-of-service SUBSCRIPTION PRICING AND TERMS: The App offers an auto-renewing monthly subscription at USD 3,99/month (or currency equivalent) and an auto-renewing yearly subscription at USD 29,99/year (or currency equivalent) to provide you with unlimited access to all PRO Features. Payment will be charged to the credit card connected to your iTunes Account when you confirm the initial subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period. Your account will be charged for renewal within 24-hours prior to the end of the current period, and the cost of the renewal will be identified.

Screenshots

Plank Challenge4 screens
100 Sit4 screens

Verdict

The call

Plank Challenge and 100 Sit both sit at 4.7 stars, but that hides the real split: 88% of 100 Sit's written reviews are positive against 66% of Plank Challenge's. Plank Challenge's advantage is ratings volume (472 vs 139). On price, rating, update cadence and ads 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. Plank Challenge sells 1 one-off in-app purchase and 100 Sit sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Plank Challenge against 4.9 for 100 Sit. Both are backed by a comparable volume of ratings — 472 and 139 respectively. Written reviews are what separate them: 66% of Plank Challenge's written reviews are positive against 88% of 100 Sit's.

UpkeepUpdate frequency

Plank Challenge ships an update every 3 weeks, 100 Sit every 2 weeks. Both last shipped on October 23, 2026.

Scorecard2 real differences · 8 level
Plank Challenge versus 100 Sit: the parameters behind the verdict, then further details
ParameterPlank Challenge100 Sit
PriceFreeFree
Rating4.7 (472 ratings)4.9 (139 ratings) — better
Positive reviews65.7% of reviews87.8% of reviews — better
Number of ratings472 — better139
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.016.0
Further details — not scored
Size17 MB370 MB
Age rating4+4+
DeveloperBo KalvslundFoxyfitness GmbH

Customer experience

Plank Challenge

All ratings471 ratings
Positive93.8%
Neutral3.6%
Negative2.5%
Written reviews35 reviews
Positive65.7%
Neutral14.3%
Negative20.0%

100 Sit

All ratings138 ratings
Positive97.1%
Neutral0.7%
Negative2.2%
Written reviews41 reviews
Positive87.8%
Neutral0.0%
Negative12.2%

User reviews

Plank Challenge

From 472 App Store ratings

What we love

  • 👍 Simple and effective
  • 💪 Great for plank challenges
  • 🎯 Helps build stamina
  • ✅ Good for beginners
  • ✨ Straightforward design

Room to improve

  • 🔇 Music pauses during sets
  • 🎵 Lack of in-app music/motivation
  • ❓ No clear guidance on plank types
  • 🎛️ No timer customization
  • 👎 Push-up part lacks challenge

100 Sit

From 139 App Store ratings

What we love

  • 👍 Motivates users to continue
  • 👍 Reliable and trustworthy
  • 👍 Fun and encouraging
  • 👍 Good for home workouts
  • 👍 Good motivation

Room to improve

  • 👎 Inaccurate counting
  • 👎 Settings not intuitive
  • 👎 Frequent premium upsells
  • 👎 Usability issues on smartphones
  • 👎 App becomes faulty after in-app purchase

Bugs and requests

Plank Challenge

Reported bugs

4 issues
  • App crashes after iOS 13 update
  • No times displayed after iOS 13 update
  • Audio mutes automatically between active and rest
  • App not running after iOS 13 update

Requested features

10 requests
  • Allow self-designed workouts
  • Integrate reminders
  • Add in-app music or motivational sounds
  • Provide explanation on different plank types
  • Include countdowns and motivational cues
Show 5 more
  • Suggest exercises for rest periods
  • Modern and minimalist design
  • Add a training plan for push-ups
  • Voice countdown for seconds
  • Dark mode option

100 Sit

Reported bugs

4 issues
  • Counts sit-ups inaccurately
  • App freezes after in-app purchase
  • Accidentally pay for premium due to screen sensitivity
  • Pause ends too soon due to screen sensitivity

Requested features

4 requests
  • Allow filters to be set permanently
  • Wish for a way to go back
  • Language option for Russian
  • Option to go back

In-app purchases

1 purchases

Plank Challenge

One-time1
  • Plank Challenge Pro$0.99
2 purchases

100 Sit

Subscriptions2
  • Sit-Ups PRO3 Days trial$3.991 Month
  • Sit-Ups PRO3 Days trial2 variants$19.991 Year

Questions

Is Plank Challenge free?
Plank Challenge is free to download, with in-app purchases available.
Is 100 Sit free?
100 Sit is free to download, with in-app purchases available.
Which has better reviews, Plank Challenge or 100 Sit?
100 Sit is rated higher. Plank Challenge averages 4.7 out of 5 from 472 ratings, while 100 Sit averages 4.9 from 139 ratings.
Do Plank Challenge or 100 Sit have ads?
Both Plank Challenge and 100 Sit show ads.
Which is updated more often, Plank Challenge or 100 Sit?
Plank Challenge ships an update every 3 weeks, and 100 Sit every 2 weeks. Most recently, Plank Challenge was updated on October 23, 2026 and 100 Sit on October 23, 2026.

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