# WetMath vs ReefKeep

The clearest difference is ads: ReefKeep at none against WetMath's shown. ReefKeep also leads on update cadence (daily vs every 2 weeks). WetMath's advantage is iOS requirement (15.6 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. WetMath sells 2 one-off in-app purchases and ReefKeep sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

WetMath ships an update every 2 weeks, ReefKeep daily. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | WetMath | ReefKeep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Daily** |
| Size | 49 MB | 2 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NanoHawk](https://appshunter.io/developer/1805616299) | [Enovira AB](https://appshunter.io/developer/1878624311) |

## What reviewers say

### WetMath

[App page](https://appshunter.io/ios/app/wetmath-aquarium-calculator/id6745920042)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WetMath Pro Unlock | $0.99 | one-time |
| WetMath™ Pro Unlock | $9.99 | one-time |


### ReefKeep

[App page](https://appshunter.io/ios/app/reefkeep/id6762442240)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReefKeep Pro - monthly | $4.99 | per month |
| ReefKeep Pro - Yearly | $29.99 | per year |
| ReefKeep Lifetime Subscription | $79.99 | one-time |


## Frequently asked questions

### Is WetMath free?

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

### Is ReefKeep free?

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

### Do WetMath or ReefKeep have ads?

WetMath shows ads; ReefKeep does not.

### Which is updated more often, WetMath or ReefKeep?

WetMath ships an update every 2 weeks, and ReefKeep daily. Most recently, WetMath was updated on October 28, 2026 and ReefKeep on October 24, 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.*