# StressTracker vs Hydra

The clearest difference is device support: Hydra at 3 against StressTracker's 1. Hydra also leads on iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. StressTracker sells 2 in-app purchases, starting at $5.99 per 7 days and Hydra sells 6 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | StressTracker | Hydra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | — | Fortnightly |
| Size | 22 MB | 75 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Floude LLC](https://appshunter.io/developer/1825462498) | [ANASTASIYA BATURYNA](https://appshunter.io/developer/1869930793) |

## What reviewers say

### StressTracker

[App page](https://appshunter.io/ios/app/stresstracker-ai-stress-track/id6748364982)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week Subscription | $5.99 | per 7 days |
| 1 Year Subscription | $49.99 | per year |


### Hydra

[App page](https://appshunter.io/ios/app/hydra-water-tracker-and-widget/id6752789853)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP Monthly | $5.99 | per month |
| VIP Monthly 3 days free | $5.99 | per month |
| VIP Yearly 85% Off | $10.99 | per year |
| VIP Annual | $29.99 | per year |
| VIP Annual 7 days free | $49.99 | per year |
| VIP Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is StressTracker free?

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

### Is Hydra free?

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

### Do StressTracker or Hydra have ads?

Both StressTracker and Hydra show ads.

---

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