# Koi Shape vs H2O Reminder Pro

The clearest difference is ads: H2O Reminder Pro at none against Koi Shape's shown. Koi Shape's advantage is update cadence (monthly vs every 9 months) and iOS requirement (15.1 vs 18.4). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Koi Shape ships an update monthly, H2O Reminder Pro every 9 months. The most recent releases landed on October 6, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Koi Shape | H2O Reminder Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 9 months |
| Size | 26 MB | 4 MB |
| Requires iOS | **15.1** | 18.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [QUY DIEN LE](https://appshunter.io/developer/1745588028) | [Grzegorz Rakoca](https://appshunter.io/developer/1778459428) |

## What reviewers say

### Koi Shape

[App page](https://appshunter.io/ios/app/koi-shape/id6745516636)

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

**In-app purchases:** none


### H2O Reminder Pro

[App page](https://appshunter.io/ios/app/h2o-reminder-pro/id6746629890)

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

**In-app purchases:** none


## Frequently asked questions

### Is Koi Shape free?

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

### Is H2O Reminder Pro free?

H2O Reminder Pro is free to download, with no in-app purchases.

### Do Koi Shape or H2O Reminder Pro have ads?

Koi Shape shows ads; H2O Reminder Pro does not.

### Which is updated more often, Koi Shape or H2O Reminder Pro?

Koi Shape ships an update monthly, and H2O Reminder Pro every 9 months. Most recently, Koi Shape was updated on October 6, 2026 and H2O Reminder Pro on October 18, 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.*