# Waterfaster vs HYDRA.IO

Waterfaster and HYDRA.IO are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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. Waterfaster sells 3 in-app purchases, starting at $3.99 per 7 days and HYDRA.IO sells 1 in-app purchase, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Waterfaster ships an update every 11 days, HYDRA.IO fortnightly. The most recent releases landed on October 5, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Waterfaster | HYDRA.IO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 11 days** | Fortnightly |
| Size | 59 MB | 25 MB |
| Requires iOS | 16.4 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 17+ | 12+ |
| Developer | [AMIT Solutions](https://appshunter.io/developer/1892726088) | [Clement Dupre](https://appshunter.io/developer/1887211457) |

## What reviewers say

### Waterfaster

[App page](https://appshunter.io/ios/app/waterfaster-fasting-tracker/id6762065095)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Waterfaster+ | $3.99 | per 7 days |
| Waterfaster+ | $44.99 | per year |
| Lifetime | $89.99 | one-time |


### HYDRA.IO

[App page](https://appshunter.io/ios/app/hydraio/id6790794354)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HYDRA Pro | $3.99 | per month |


## Frequently asked questions

### Is Waterfaster free?

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

### Is HYDRA.IO free?

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

### Do Waterfaster or HYDRA.IO have ads?

Neither Waterfaster nor HYDRA.IO shows ads.

### Which is updated more often, Waterfaster or HYDRA.IO?

Waterfaster ships an update every 11 days, and HYDRA.IO fortnightly. Most recently, Waterfaster was updated on October 5, 2026 and HYDRA.IO on October 10, 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.*