# S2 vs Gym Diary

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.

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.

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.

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

## The numbers

| Metric | S2 | Gym Diary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (129 ratings)](https://appshunter.io/ios/app/s2-strength-log/id1007310227/reviews) | **[4.3 (125 ratings)](https://appshunter.io/ios/app/gym-diary-workout-tracker-log/id1328908841/reviews)** |
| Number of ratings | **129** | 125 |
| Positive reviews | 41.3% of reviews | **54.2% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 9 MB | 37 MB |
| Requires iOS | **16.0** | 16.1 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 12+ | 4+ |
| Developer | [Formbound AB](https://appshunter.io/developer/531002945) | [Nishan Niraula](https://appshunter.io/developer/1328908390) |

## What reviewers say

### S2

[App page](https://appshunter.io/ios/app/s2-strength-log/id1007310227)

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:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| S2 Yearly | $22.99 | per year |
| Strongly Pro | $4.99 | one-time |


### Gym Diary

[App page](https://appshunter.io/ios/app/gym-diary-workout-tracker-log/id1328908841)

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:** Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gym DIary Premium - Weekly | $1.99 | per 7 days |
| Gym Diary Premium - Monthly | $3.99 | per month |
| Gym Diary Premium - Monthly | $4.99 | per month |
| Gym Diary - Yearly Plan | $14.99 | per year |
| Gym Diary Premium - Yearly | $24.99 | per year |
| Gym Diary Premium - Yearly | $29.99 | per year |
| Gym Diary Lifetime | $34.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use UI
- 💪 Great for tracking workouts
- ✅ Allows custom workout routines
- 📈 Satisfying progress tracking with charts
- ✨ Sleek and user-friendly design

**What reviewers complain about**

- 💰 Paywall for basic features
- 💸 Forced to pay for membership again
- 🚫 No free trial or limited features
- 📉 Updates are poor and buggy
- 🔒 Many features locked by subscription

**Reported bugs**

- 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

**Requested features**

- 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


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*