Comparison

S2 vs Gym Diary

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

Head to head
About

S2

This app helps you track and visualize your gym workout progress, encouraging progressive overload for weight loss or muscle gain. It offers a fast, intuitive interface with over 1000 exercises and a unique muscle fatigue heat map. No account is needed, and it integrates with HealthKit.

Highlights
  • Track and visualize workout progress
  • Muscle fatigue heat map
  • Create unlimited workout routines
  • Encourages progressive overload
  • 1000+ exercises
  • Workout history review
  • HealthKit integration
Features
Read full description

S2 (Superior Self) is your ultimate workout companion, allowing you to track and visualize your workout progress. Whether you want to lose weight or gain muscle mass, S2 is an excellent tool to help you with progressive overload and beat the yesterday you. - Premium, beautiful workout app - No account registration is required - Fast and intuitive. No load times - View your muscle fatigue on a body heat map - Create unlimited workout routines - Encourages progressive overload - 1000+ exercises - Improved insights over time How does it work? Start by creating your workout routines in S2. Your first workout for any given routine will act as a baseline for the next workout, encouraging you to do more work by moving more mass. The technical term for this is called progressive overload, and it's the core principle behind any successful strength training. Between workouts (or during an ongoing workout) you can review your past performance by easily accessing your workout history. S2 integrates with HealthKit to register your workouts. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Gym Diary

This app helps you meticulously track every aspect of your gym workouts, from sets and reps to body measurements and nutrition. Plan routines, log exercises, and visualize your progress with detailed graphs to achieve your fitness goals.

Highlights
  • Workout planner and gym log
  • Complete workout tracker
  • Weightlifting tracker and rep counter
  • Unlimited custom exercises
  • Workout progress tracker with strength graphs
  • Body measurements and weight tracker
  • Calorie and nutrition tracker
Features
Read full description

Track Every Rep, Set & Workout with Gym Diary: The Ultimate Gym Log & Workout Tracker Gym Diary is more than just a workout tracker app. It's your complete companion for weightlifting, bodybuilding, and strength training success. Whether you're a beginner or advanced lifter, our gym log app helps you plan workout routines, track exercise progress, and stay consistent with every gym session. Perfect for home workouts or hitting the gym. It's the fitness planner that adapts to your lifestyle. Join thousands of lifters who've transformed their training with Gym Diary. Use it as your daily training log and rep counter to monitor every detail. This workout tracker keeps you motivated and making real progress toward your fitness goals. Core Features: • Workout Planner & Gym Log Design your training week with custom workout routines. Our fitness planner lets you create weekly schedules or quick workout drafts for gym sessions. • Complete Workout Tracker & Training Log Record every detail of your gym workouts. Log sets, reps, weights, and time for any exercise. Whether it's weightlifting, strength training, or home workouts, this workout tracker captures everything. • Weightlifting Tracker & Rep Counter Our dedicated rep counter makes it effortless to log your lifts and track rest periods. Perfect for bodybuilding splits, strength training blocks, and powerlifting. Count every rep and track your progression. • Unlimited Exercise Tracker & Custom Workouts Create unlimited custom exercises for free. This exercise tracker gives you complete freedom to log exactly what you do. • Workout Progress Tracker & Strength Graphs Visualize strength gains, monitor body changes, and review your complete gym log history. Track workout progress over days, weeks, and months. • Body Measurements & Weight Tracker Track body weight, biceps, chest, thighs, waist, and more. An essential bodybuilding tracker feature that pairs with your fitness planner. • Calorie & Nutrition Tracker Monitor daily calorie intake alongside your training log to align nutrition with your workout goals. Whether bulking, cutting, or maintaining, keep everything in one place. • Workout Widgets & Lock Screen Access Your workout routine is one tap away. Add widgets to see your fitness planner calendar and recent gym sessions. • iCloud Sync & Backup All your workout tracker history syncs securely across your devices. Never worry about losing your training log data. • Beautiful Dark Mode & Custom App Icons Choose from multiple app icons and enjoy dark mode during early morning or late-night gym workouts. Whether you're into weightlifting, bodybuilding, strength training, powerlifting, or general fitness, Gym Diary works for you. From gym workouts to home workouts, from tracking heavy lifts to counting reps, this workout tracker handles it all. Perfect for beginners learning progression, intermediate lifters chasing strength goals, and advanced athletes fine-tuning their training log. Gym Diary helps you track exercise, measure progress, and prove you're getting better. Use Gym Diary as your daily gym log, comprehensive training log, and intelligent exercise tracker in one beautiful app. Plan your workout routine on Sunday, execute through the week, and review progress on Friday. Stay consistent and watch your fitness goals become reality. Download Gym Diary today and experience why thousands trust it as their #1 gym log and workout tracker. Start tracking your workout routine, count every rep, log every set, and build the physique you've always wanted. To enjoy the full experience and gain access to all features, you can purchase one of our subscription plan or one time plan. All your previous purchases can be easily restored using the **Restore Purchase** option in the app. This will provide you access to all the premium features. You can view Gym Diary Terms of Service & Privacy Policy at: https://nrlnishan.github.io/gymdiary/privacypolicy/

Screenshots

S24 screens
Gym Diary4 screens

Verdict

The call

S2 and Gym Diary both sit at 4.1 stars, but that hides the real split: 54% of Gym Diary's written reviews are positive against 41% of S2's. On price, rating, ratings volume and update cadence 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. S2 sells 2 in-app purchases, starting at $22.99 per year and Gym Diary sells 7 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Gym Diary holds the better App Store score, 4.3 against 4.1. Both are backed by a comparable volume of ratings — 129 and 125 respectively. Written reviews point the same way: 41% of S2's written reviews are positive against 54% of Gym Diary's.

UpkeepUpdate frequency

S2 ships an update fortnightly, Gym Diary every 3 weeks. The most recent releases landed on October 20, 2026 and October 25, 2026 respectively.

Scorecard1 real difference · 9 level
S2 versus Gym Diary: the parameters behind the verdict, then further details
ParameterS2Gym Diary
PriceFreeFree
Rating4.1 (129 ratings)4.3 (125 ratings) — better
Positive reviews41.3% of reviews54.2% of reviews — better
Number of ratings129 — better125
Update frequencyFortnightly — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhoneiPhone, iPad — better
Requires iOS16.0 — better16.1
Further details — not scored
Size9 MB37 MB
Age rating12+4+
DeveloperFormbound ABNishan Niraula

Customer experience

S2

All ratings126 ratings
Positive73.8%
Neutral11.9%
Negative14.3%
Written reviews75 reviews
Positive41.3%
Neutral22.7%
Negative36.0%

Gym Diary

All ratings125 ratings
Positive81.6%
Neutral6.4%
Negative12.0%
Written reviews59 reviews
Positive54.2%
Neutral13.6%
Negative32.2%

Bugs and requests

S2

Not enough reviews yet to summarise bugs or requests.

Gym Diary

Reported bugs

15 issues
  • App crashes between sets
  • App freezes and data is lost
  • Latest update is buggy
  • Updates consistently have glitches
  • Can't use on other devices with the same account
Show 10 more
  • App crashes after purchasing
  • Won't save sets
  • Bugs don't save workouts correctly
  • Can't log weight or reps
  • App closes when making a new exercise
  • Can't add exercises to routines
  • Notes disappear when adding exercises
  • Can't select checkmark to finish adding reps and weight
  • Routine won't log more than one muscle group
  • Wrong units selected (metric vs. feet/inches)

Requested features

21 requests
  • Watch app for Apple Watch
  • Allow editing exercises without deleting
  • Separate notes tab for general notes
  • Drag and drop exercises for order
  • Edit exercises within a day
Show 16 more
  • Add custom muscle groups
  • Rest timer that counts down
  • Completed sets/routines greyed out, not disappeared
  • Option to increase all weights by percentage
  • Add diagrams to depict exercises
  • Start workout button with rest breaks
  • Ability to add created exercises to workouts
  • Add a note to a given day's exercises
  • Edit an exercise or add a missed exercise to a previous day
  • Graph showing max reps or total reps per day
  • Option to remove workouts
  • Add custom exercises not in the list
  • Dark mode option
  • Advanced analytics dashboard
  • Sync across devices
  • Allow one free exercise and one free workout plan

In-app purchases

2 purchases

S2

Subscriptions1
  • S2 Yearly$22.991 Year
One-time1
  • Strongly Pro$4.99
7 purchases

Gym Diary

Subscriptions6
  • Gym DIary Premium - Weekly3 Days trial$1.997 Days
  • Gym Diary Premium - Monthly$3.991 Month
  • Gym Diary Premium - Monthly$4.991 Month
Show 3 more
  • Gym Diary - Yearly Plan$14.991 Year
  • Gym Diary Premium - Yearly3 Days trial$24.991 Year
  • Gym Diary Premium - Yearly$29.991 Year
One-time1
  • Gym Diary Lifetime$34.99

Questions

Is S2 free?
S2 is free to download, with in-app purchases available.
Is Gym Diary free?
Gym Diary is free to download, with in-app purchases available.
Which has better reviews, S2 or Gym Diary?
Gym Diary is rated higher. S2 averages 4.1 out of 5 from 129 ratings, while Gym Diary averages 4.3 from 125 ratings.
Do S2 or Gym Diary have ads?
Neither S2 nor Gym Diary shows ads.
Which is updated more often, S2 or Gym Diary?
S2 ships an update fortnightly, and Gym Diary every 3 weeks. Most recently, S2 was updated on October 20, 2026 and Gym Diary on October 25, 2026.

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