# Kreas vs Hydra

Kreas and Hydra are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Kreas sells 1 one-off in-app purchase and Hydra sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Kreas | Hydra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/kreas-creatine-tracker/id6755862949/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 41 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Rohan Chhipa](https://appshunter.io/developer/1744145477) | [Ryan Creary](https://appshunter.io/developer/1819349085) |

## What reviewers say

### Kreas

[App page](https://appshunter.io/ios/app/kreas-creatine-tracker/id6755862949)

This app helps you track your creatine levels using a dynamic saturation model. It visualizes your progress, sends smart reminders, and simplifies loading and maintenance phases. It also tracks your supplement supply and offers a clutter-free, private experience.

**Highlights:** Dynamic saturation tracking, Smart dose reminders, Simplified loading/maintenance phases, Visual progress calendar, Supply tracking, No clutter or ads

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kreas+ | $4.99 | one-time |


### 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 |


## Frequently asked questions

### Is Kreas free?

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

### Is Hydra free?

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

### Do Kreas or Hydra have ads?

Neither Kreas nor Hydra 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.*