# Hydra vs Swim Set Interval Timer

The clearest difference is price: Hydra at Free against Swim Set Interval Timer's $1.99. Hydra also leads on iOS requirement (15.1 vs 26.4). Swim Set Interval Timer's advantage is in-app purchases (none vs 2). On ads and device support there is nothing between them.

Hydra is free to download; Swim Set Interval Timer costs $1.99 up front. Hydra sells 2 in-app purchases, starting at $6.99 per month. Swim Set Interval Timer asks for nothing beyond the download.

## The numbers

| Metric | Hydra | Swim Set Interval Timer |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Size | 41 MB | 5 MB |
| Requires iOS | **15.1** | 26.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Ryan Creary](https://appshunter.io/developer/1819349085) | [STEVEN BRENT LEEPER](https://appshunter.io/developer/1896047970) |

## What reviewers say

### Hydra

[App page](https://appshunter.io/ios/app/hydra-water-tracker/id6764020000)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hydra Pro Monthly | $6.99 | per month |
| Hydra Pro Annual | $39.99 | per year |


### Swim Set Interval Timer

[App page](https://appshunter.io/ios/app/swim-set-interval-timer/id6765718926)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Hydra free?

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

### Is Swim Set Interval Timer free?

Swim Set Interval Timer costs $1.99, with no in-app purchases.

### Do Hydra or Swim Set Interval Timer have ads?

Neither Hydra nor Swim Set Interval Timer shows ads.

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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.*