# S2: Strength log — Gym workouts tracker

> Gym workout tracker for strength training and muscle gain with progressive overload. (iPhone/iPad app by Formbound AB.)

- Source: https://appshunter.io/ios/app/s2-strength-log/id1007310227 (this page in markdown: same URL + `.md`)
- Developer: [Formbound AB](https://appshunter.io/developer/531002945)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Rating: 4.10/5 from 126 App Store ratings · 75 written reviews indexed
- Age rating: 12+
- Requires: iOS 16.0 · 9 MB
- Languages: American English
- Released: 2015-10-26
- Data updated: 2026-07-17
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/s2-strength-log/id1007310227/reviews.md

## What is S2?

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/

## Key features

- Track and visualize workout progress
- Muscle fatigue heat map
- Create unlimited workout routines
- Encourages progressive overload
- 1000+ exercises
- Workout history review
- HealthKit integration

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| S2 Yearly | $22.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Strongly Pro | $4.99 | one-time |


## Recent user reviews (10 of 75)

All indexed reviews: https://appshunter.io/ios/app/s2-strength-log/id1007310227/reviews.md

### 5/5 — One of the best for gym rats 😉

*2026-04-07, version 3.3.3*

This app is for those who know their way around the gym, and don’t need blurry “instructional” videos or pics within the app - just a simple and pure logging tool for your weights, reps and sets. Easy to use and navigate. Bravo!.. P.S: would be great if the app could connect to Apple Health to upload the training session data + the Apple watch app.

### 5/5 — Flexible, easy to use

*2025-09-16, version 3.3.3*

I’ve tried about 1,000,000 weight lifting log apps. This one does everything I need, no more, no less. Love the ease of entry. The scroll wheels are much preferred to a text box that opens the keyboard. Perfect.

### 1/5 — Can’t renew subscription, can’t use the app

*2025-09-08*

My annual subscription expired and there is no longer a way for me to purchase another annual subscription. When I try to start a workout, the “you need a subscription” modal is displayed, but the Subscribe Now button is disabled.

How do I resubscribe? The app is useless without a subscription.

**Developer response:** Will fix!

### 5/5 — Straightforward app

*2025-07-14, version 3.3.3*

Great app, simple and functional; just download and start using it. No publicity, no unuseful buttons or visual elements; clean design and easy to use. A lot of exercises to pick. 
A few days ago a year plan subscription promp put, don’t know what additional functions could have but if it’s for support; it worth.

### 3/5 — Suggestion for bettering

*2024-11-21, version 3.3.3*

I used to absolutely love this app. But it seems that all the exercises I’m doing at the moment arn’t in the app at all under any variation of the names. Really disappointing as now I can’t track my progress. It’d be great if there was an option to add your own exercises and the areas they target

### 3/5 — Custom exercise

*2024-10-24, version 3.3.3*

Seems solid overall but lacking the ability to add your own exercise and dictate the muscles groups

### 5/5 — Great, easy to enter

*2024-08-26*

Very flexible app and easy entry.

One issue when entering fractions of a pound. There’s a white circle to the right of the rollers, but there’s no indicator for if it’s at 0, .25, .5, or .75. Just have to enter, then delete and adjust if it’s wrong. Please give a visual indicator for where fractions of a pound are set.

**Developer response:** Thank you so much for the review! I'm fixing that bug as we speak. Best, David

### 3/5 — Missing option to add custom exercise / note

*2024-07-02, version 3.3.2*

The app is great BUT:

- I can’t add mu workout as two exercises are missing and I don't see any option to add a custom one. 

- I also do hip thrusts on one leg at a time, so i really miss an option to add a shorty visible note under the default exercise name…

### 2/5 — So much potential

*2024-03-24, version 3.3.1*

But it feels wasted. The subscription so high, but honestly not worth it. The amount of bugs is not reasonable. You can’t clone workouts. It’s the little things. 

On top of which, the app not being updated in eight months is concerning. The second this app becomes updated it will be worth the subscription cost.

### 3/5 — Good but missing some things

*2024-03-10, version 3.3.1*

I like this app so far because I want to be able to simply plan and record my workouts with nothing too fancy. I just wish there was an option to write in your own exercises, unless I’m missing it? The available exercise list is pretty extensive but there are some mat pilates moves that aren’t listed that I would like to be able document just to help myself keep track of my own routines

## Frequently asked questions about S2

### What does S2: Strength log do?

S2: Strength log is a workout companion designed to help you track and visualize your gym progress. It focuses on encouraging progressive overload, a key principle for building muscle and losing weight, by helping you do more work over time. The app provides insights into your performance and muscle fatigue.

### What are the key features of S2: Strength log?

Key features include the ability to track and visualize workout progress, a unique muscle fatigue heat map, the creation of unlimited workout routines, and encouragement of progressive overload. It also offers over 1000 exercises, a review of workout history, and integration with HealthKit.

### Is S2: Strength log free to use?

The app is free to download and use, with in-app purchases available for premium features. The description highlights that no account registration is required to start using the app.

### What devices is S2: Strength log compatible with?

The app integrates with HealthKit, which is an Apple framework for health and fitness data. This suggests that the app is designed for iOS devices, such as iPhones and iPads.

### How does S2: Strength log help with progressive overload?

The app facilitates progressive overload by using your first workout for any routine as a baseline. Subsequent workouts encourage you to increase the mass you move or the volume you complete, helping you to consistently improve and beat your previous performance.

## Version history (last 5 releases)

### 3.3.3 — 2024-09-22

Fixed issue where decimal selector wasn't visible

### 3.3.2 — 2024-04-15

Minor improvements and bug fixes

### 3.3.1 — 2023-07-18

Fixed issue where muscle group fatigue does not show up correctly for some users.

### 3.3.0 — 2023-07-09

- S2 has been given a color scheme upgrade, and is now exclusively in dark mode. This feature has been requested by many, especially by Strongly veterans. I hope you like it!
- Items in the tab bar has been renamed.
- All new progress tab shows more details for both current week and all-time metrics.

### 3.2.2 — 2023-07-04

Bug fixes

## Apps similar to S2

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Strong Workout Tracker Gym Log](https://appshunter.io/ios/app/strong-workout-tracker-gym-log/id464254577) | 4.9 (108,437) | Free | Health & Fitness |
| [RepCount - Gym Workout Tracker](https://appshunter.io/ios/app/repcount-gym-workout-tracker/id594982044) | 4.9 (12,805) | Free | Health & Fitness |
| [Gravitus - Gym Workout Tracker](https://appshunter.io/ios/app/gravitus-gym-workout-tracker/id965383840) | 4.8 (3,194) | Free | Health & Fitness |
| [Hevy - Workout Tracker Gym Log](https://appshunter.io/ios/app/hevy-workout-tracker-gym-log/id1458862350) | 4.9 (80,412) | Free | Health & Fitness |
| [StrengthLog – Workout Tracker](https://appshunter.io/ios/app/strengthlog-workout-tracker/id1434229662) | 4.9 (3,194) | Free | Health & Fitness |
| [Strongify - Rep Count](https://appshunter.io/ios/app/strongify-rep-count/id1436592070) | 4.5 (280) | Free | Health & Fitness |

## Related topics

[s2 fitness](https://appshunter.io/ios/topics/s2-fitness) · [starting strength v2](https://appshunter.io/ios/topics/starting-strength-v2)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-17.*