# Hydration Tracker vs Paul's Gym

The clearest difference is in-app purchases: Paul's Gym at none against Hydration Tracker's 5. Paul's Gym also leads on ads (none vs shown) and iOS requirement (15.1 vs 18.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Hydration Tracker sells 5 in-app purchases, starting at $1.49 per 7 days. Paul's Gym asks for nothing beyond the download.

Hydration Tracker ships an update every 9 days, Paul's Gym fortnightly. Both last shipped on October 30, 2026.

## The numbers

| Metric | Hydration Tracker | Paul's Gym |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (26 ratings)](https://appshunter.io/ios/app/hydration-tracker-liquid-cats/id6744845359/reviews)** | — |
| Number of ratings | **26** | — |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 9 days** | Fortnightly |
| Monetization | Free with in-app purchases | — |
| Size | 34 MB | 29 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Nikita Zhukov](https://appshunter.io/developer/974791842) | [Alexander Paul Probst](https://appshunter.io/developer/1824470732) |

## What reviewers say

### Hydration Tracker

[App page](https://appshunter.io/ios/app/hydration-tracker-liquid-cats/id6744845359)

This gamified hydration tracker helps you build a healthy habit of drinking water regularly. It offers smart reminders, customizable goals based on your profile, and a collection of fun cat characters to keep you motivated. Track various beverages and view your progress with detailed logs and statistics.

**Highlights:** Gamified hydration tracking, Smart daily water reminders, Customizable goal calculator, Collection of cat characters, Log of 38 popular beverages, Detailed history and stats, Ad-free experience

**Features:** Apple Watch app

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.49 | per 7 days |
| Monthly | $2.99 | per month |
| Annual | $8.99 | per year |
| Cats friend | Free | one-time |
| Lifetime | $17.99 | one-time |


### Paul's Gym

[App page](https://appshunter.io/ios/app/pauls-gym/id6748144796)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydration Tracker free?

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

### Is Paul's Gym free?

Paul's Gym is free to download, with no in-app purchases.

### Do Hydration Tracker or Paul's Gym have ads?

Hydration Tracker shows ads; Paul's Gym does not.

### Which is updated more often, Hydration Tracker or Paul's Gym?

Hydration Tracker ships an update every 9 days, and Paul's Gym fortnightly. Most recently, Hydration Tracker was updated on October 30, 2026 and Paul's Gym on October 30, 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.*