Comparison

S2 vs StrengthLog

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

StrengthLog

Track your workouts, analyze progress, and discover proven strength training programs. Log unlimited workouts, access a vast exercise library, and set goals. Upgrade for advanced statistics and premium programs.

Highlights
  • Unlimited workout logging
  • Extensive exercise library with video instructions
  • Proven strength training programs
  • Progress analysis and statistics
  • Goal setting and streak tracking
  • Plate calculator and rest timer
  • Apple Health integration
Features
Read full description

** The world’s most generous workout tracker – built by lifters, for lifters ** Tired of downloading gym apps and creating an account, just to be locked out in a matter of days if you don’t pay or watch endless commercials? We offer 100% gains and 0% ads – with unlimited workout logging and free support for all users! This app is both a workout log and a source for proven strength training programs and tools that will help you reach your fitness goals. With it, you're able to log every workout, view and analyze your progress, find a workout routine that's right for you, create goals, and chase streaks. It’s truly built for lifters, by lifters (in cooperation with hundreds of thousands of other lifters). Have a feature suggestion? Drop us a line at app@strengthlog.com! Our goal is to make our free version the best strength training app on the market! Using it, you can log infinite workouts, add your own exercises, view basic statistics, and track your PRs (both singles and rep records). You’ll also get access to a big library of workouts and training programs for different training goals. If you level up to a premium subscription, you'll gain access to more advanced statistics, our full library of training programs, and our most hardcore features. You will also contribute to the continued development of the app, and we thank you greatly for that! Is that it? No, but it's easier to download the app and see for yourself the next time you're at the gym! Free Features: • Log an unlimited number of workouts. • A massive exercise library with both written and video instructions. • Lots of popular and proven workouts and training programs. • An exercise library with 500+ strength training, mobility, and cardio exercises, plus zero restrictions on how many exercises you can add yourself. • Complete our monthly challenges for added motivation. • A plate calculator that shows you how to load the barbell. • Plan your workouts in advance. • A workout rest timer. • Stats for training volume and workouts. • PR tracking. • Create training goals and streaks. • Several tools and calculators, like 1RM estimates and suggested warm-ups before PR attempts. • Share your data with Apple Health. As a subscriber, you'll also gain access to: • Our entire catalog of premium programs, including ones for individual lifts, powerlifting, bodybuilding, powerbuilding, push/pull/legs, and lots of sport-specific workout routines. • Advanced statistics for tracking and analyzing your strength, training volume, individual lifts/exercises, and more • Summary statistics for all your training, individual muscle groups, and every exercise. • Our muscles worked anatomy map shows how you’ve trained your muscle groups during any given period. • Create unlimited goals and streaks. • Share workouts and training programs with other users. • Advanced logging features include % of 1RM, Rate of Perceived Exertion, Reps in Reserve, and quick stats for every set. We're constantly updating the StrengthLog App with new programs, tools, and features based on our users' wishes! Subscriptions In-app, you can subscribe to our premium version of the StrengthLog App, in the form of automatically renewable subscriptions. • Choose between 1 month, 3 months, and 12 months. • Your subscription will be charged to your App Store account upon confirmation of purchase and will be renewed automatically if the subscription is not canceled at least 24 hours before the end of the current period. • An active subscription cannot be canceled before the active subscription period has ended. However, you can turn auto-renew on/off in your App Store account settings. --- Apple Health When giving the app permission to sync with Apple Health, we only share the information you request us to share – the app does not receive any data in return – and the data is only shared with your private Apple account.

Screenshots

S24 screens
StrengthLog4 screens

Verdict

The call

The clearest difference is review sentiment: StrengthLog at 89% against S2's 41%. StrengthLog also leads on rating (4.9 vs 4.1) and ratings volume (3.6K vs 126). On price, update cadence, ads and in-app purchases 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 StrengthLog sells 3 in-app purchases, starting at $16.90 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

StrengthLog holds the better App Store score, 4.9 against 4.1. That said, the two scores are not equally well evidenced: StrengthLog has 3.6K ratings behind it against 126, so its average is the more settled of the two. Written reviews point the same way: 41% of S2's written reviews are positive against 89% of StrengthLog's.

UpkeepUpdate frequency

S2 ships an update fortnightly, StrengthLog every 10 days. The most recent releases landed on July 17, 2026 and September 29, 2026 respectively.

Scorecard4 real differences · 6 level
S2 versus StrengthLog: the parameters behind the verdict, then further details
ParameterS2StrengthLog
PriceFreeFree
Rating4.1 (126 ratings)4.9 (3.6K ratings) — better
Positive reviews41.3% of reviews88.5% of reviews — better
Number of ratings1263.6K — better
Update frequencyFortnightlyEvery 10 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhoneiPhone, iPad, iPod, Apple Watch — better
Requires iOS16.015.0 — better
Further details — not scored
Size9 MB184 MB
Age rating12+4+
DeveloperFormbound ABStyrkelabbet AB

Customer experience

S2

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

StrengthLog

All ratings3,637 ratings
Positive97.6%
Neutral1.3%
Negative1.1%
Written reviews384 reviews
Positive88.5%
Neutral4.2%
Negative7.3%

Bugs and requests

S2

Not enough reviews yet to summarise bugs or requests.

StrengthLog

Reported bugs

3 issues
  • Disappearing workout data
  • Inability to clear/reset workout history
  • Inconsistent behavior when planning workouts for the same day

Requested features

4 requests
  • Ability to save and edit custom workout plans
  • Seamless integration with Apple Health
  • Community features like challenges and leaderboards
  • More personalized workout recommendations

In-app purchases

2 purchases

S2

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

StrengthLog

Subscriptions3
  • StrengthLog Premium - 1 month14 Days trial$16.901 Month
  • StrengthLog Premium - 3 months14 Days trial$37.903 Months
  • StrengthLog Premium - 1 year14 Days trial$109.001 Year

Questions

Is S2 free?
S2 is free to download, with in-app purchases available.
Is StrengthLog free?
StrengthLog is free to download, with in-app purchases available.
Which has better reviews, S2 or StrengthLog?
StrengthLog is rated higher. S2 averages 4.1 out of 5 from 126 ratings, while StrengthLog averages 4.9 from 3.6K ratings.
Do S2 or StrengthLog have ads?
Neither S2 nor StrengthLog shows ads.
Which is updated more often, S2 or StrengthLog?
S2 ships an update fortnightly, and StrengthLog every 10 days. Most recently, S2 was updated on July 17, 2026 and StrengthLog on September 29, 2026.

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