# HydroRing vs Waterday

The clearest difference is in-app purchases: Waterday at none against HydroRing's 1. Waterday also leads on update cadence (every 3 days vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. HydroRing sells 1 one-off in-app purchase. Waterday asks for nothing beyond the download.

HydroRing ships an update every 6 weeks, Waterday every 3 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | HydroRing | Waterday |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 days** |
| Size | 2 MB | 8 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [torankirite](https://appshunter.io/developer/1883564850) | [Daisuke Minami](https://appshunter.io/developer/1762826742) |

## What reviewers say

### HydroRing

[App page](https://appshunter.io/ios/app/hydroring-water-tracker/id6760393366)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HydroRing Premium | $3.99 | one-time |


### Waterday

[App page](https://appshunter.io/ios/app/waterday-water-tracker/id6792476155)

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

**In-app purchases:** none


## Frequently asked questions

### Is HydroRing free?

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

### Is Waterday free?

Waterday is free to download, with no in-app purchases.

### Do HydroRing or Waterday have ads?

Neither HydroRing nor Waterday shows ads.

### Which is updated more often, HydroRing or Waterday?

HydroRing ships an update every 6 weeks, and Waterday every 3 days. Most recently, HydroRing was updated on October 25, 2026 and Waterday on October 25, 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.*