Comparison

100 Sit vs Reflex

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

Head to head
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.

About

Reflex

Read full description

Reflex measures in 20 seconds how sharp your mind is today – and shows you over weeks what really affects your reactions: sleep, activity, resting heart rate, HRV, coffee or exercise. One test a day, one number, one clear picture. NO ACCOUNT. NO TRACKING. NO ADS. All data stays on your device. Apple Health is only read, never shared and never stored in iCloud. The daily test is free and always will be. 20 SECONDS A DAY Tap as soon as the screen turns green – as fast as you can. Reflex measures the moment your finger touches the screen, detects false starts and lapses, and takes the median of all reactions. The method is a compact form of the Psychomotor Vigilance Task that sleep researchers use to measure alertness. YOUR DAY AT A GLANCE The Today tab shows your score compared to your 7-day average, your streak, your best and the day's health context: last night's sleep, yesterday's steps, resting heart rate, HRV and when you woke up. HISTORY OVER WEEKS Trend chart with moving average and personal best, every session with all trials in detail. A weekly recap sums up average, best day and the comparison to last week – shareable as an image. WHAT MAKES YOU FASTER After seven days with data, Reflex calculates the relationship between your reaction time and each health metric: "From 7 h of sleep: 8% faster." Not from studies, but from your own numbers. EXPERIMENTS Tag days with coffee, alcohol, exercise, stress or little sleep – and see what makes the difference for you. DAILY FORECAST In the morning, Reflex predicts from your sleep and heart data what today has in store. After the test you see whether you did better than expected. WIDGET, SIRI, REMINDER Home and Lock Screen widgets with today's score and streak, the "Start Reflex test" shortcut for Siri and the Action button, and a daily reminder only on days you haven't tested yet. REFLEX PRO – €7.99 PER YEAR OR €19.99 ONCE • All insights in detail: steps, resting heart rate, HRV, time since waking • Daily forecast "expected vs. actual" • Experiments: with and without coffee, exercise, alcohol • Patterns by weekday and time of day • Unlimited history, CSV export, weekly recap as an image • iCloud sync of your test results across your devices The yearly plan starts with 7 days free. The sleep insight and the daily test always stay free. Reflex is not a medical device. Its analyses show relationships in your own data and do not replace medical advice. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://csappworks.de/reflex/datenschutz

Screenshots

100 Sit4 screens
Reflex4 screens

Verdict

The call

The clearest difference is ads: Reflex at none against 100 Sit's shown. Reflex also leads on update cadence (every 2 days vs every 2 weeks). 100 Sit's advantage is iOS requirement (16.0 vs 18.0). On price, 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. 100 Sit sells 2 in-app purchases, starting at $3.99 per month and Reflex sells 2 in-app purchases, starting at $6.99 per year. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

100 Sit ships an update every 2 weeks, Reflex every 2 days. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 7 level
100 Sit versus Reflex: the parameters behind the verdict, then further details
Parameter100 SitReflex
PriceFreeFree
Rating4.9 (139 ratings) — better—
Positive reviews87.8% of reviews—
Number of ratings139 — better—
Update frequencyEvery 2 weeksEvery 2 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better18.0
Further details — not scored
Size370 MB2 MB
Age rating4+4+
DeveloperFoxyfitness GmbHCarsten Schaal

Bugs and requests

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

Reflex

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

100 Sit

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

Reflex

Subscriptions1
  • Reflex Pro – Yearly7 Days trial$6.991 Year
One-time1
  • Reflex Pro – Lifetime$17.99

Questions

Is 100 Sit free?
100 Sit is free to download, with in-app purchases available.
Is Reflex free?
Reflex is free to download, with in-app purchases available.
Do 100 Sit or Reflex have ads?
100 Sit shows ads; Reflex does not.
Which is updated more often, 100 Sit or Reflex?
100 Sit ships an update every 2 weeks, and Reflex every 2 days. Most recently, 100 Sit was updated on October 30, 2026 and Reflex on October 24, 2026.

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