# Hydra Gym vs Diary

The clearest difference is review sentiment: Diary at 67% against Hydra Gym's 0%. Hydra Gym's advantage is in-app purchases (none vs 1) and update cadence (every 4 weeks vs every 7 months). On price, ads and device support there is nothing between them.

Both are free to download. Diary sells 1 in-app purchase, starting at $0.99 per month. Hydra Gym asks for nothing beyond the download.

Hydra Gym ships an update every 4 weeks, Diary every 7 months. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Hydra Gym | Diary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/diary-cbt-notes/id1661301401/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | **66.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 7 months |
| Monetization | **Free** | Freemium |
| Size | 29 MB | 20 MB |
| Requires iOS | **13.4** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fitbase](https://appshunter.io/developer/1530906929) | [Ivan Medvedev](https://appshunter.io/developer/1661301403) |

## What reviewers say

### Hydra Gym

[App page](https://appshunter.io/ios/app/hydra-gym/id1601637077)

This app allows users to view current training schedules, book group fitness classes, and receive reminders for upcoming sessions. It also helps users track the expiration dates of their gym memberships and services.

**Highlights:** View training schedules, Book group classes, Receive workout reminders, Track membership expiration

**Features:** macOS Compatibility

**In-app purchases:** none


### Diary

[App page](https://appshunter.io/ios/app/diary-cbt-notes/id1661301401)

This app helps you track your thoughts, emotions, and behaviors to understand and change unhelpful patterns. It's a tool for developing coping strategies and improving overall well-being through cognitive behavioral therapy techniques.

**Highlights:** Record events, thoughts, and emotions, Identify cognitive distortions, Track behaviors and body reactions, Develop rational responses, Monitor progress over time, Set mental health goals

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $0.99 | per month |


## Frequently asked questions

### Is Hydra Gym free?

Hydra Gym is free to download, with no in-app purchases.

### Is Diary free?

Diary is free to download, with in-app purchases available.

### Do Hydra Gym or Diary have ads?

Neither Hydra Gym nor Diary shows ads.

### Which is updated more often, Hydra Gym or Diary?

Hydra Gym ships an update every 4 weeks, and Diary every 7 months. Most recently, Hydra Gym was updated on October 7, 2026 and Diary on October 24, 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.*