# ReefKeeper vs FishDiary

The clearest difference is ads: ReefKeeper at none against FishDiary's shown. ReefKeeper also leads on update cadence (weekly vs monthly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. ReefKeeper sells 3 in-app purchases, starting at $4.99 per month and FishDiary sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ReefKeeper ships an update weekly, FishDiary monthly. The most recent releases landed on October 31, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ReefKeeper | FishDiary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Monthly |
| Size | 5 MB | 115 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [Jose Salcido](https://appshunter.io/developer/1895673171) | [MAKOTO NAKAGAWA](https://appshunter.io/developer/1850679004) |

## What reviewers say

### ReefKeeper

[App page](https://appshunter.io/ios/app/reefkeeper-aquarium-tracker/id6780324072)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reef Keeper Pro Monthly | $4.99 | per month |
| Reef Keeper Pro Yearly | $44.99 | per year |
| Reef Keeper Pro: Lifetime | $99.99 | one-time |


### FishDiary

[App page](https://appshunter.io/ios/app/fishdiary-aquarium-log/id6795343931)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FishDiary Pro Monthly | $1.99 | per month |
| FishDiary Pro Annual | $9.99 | per year |
| FishDiary Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is ReefKeeper free?

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

### Is FishDiary free?

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

### Do ReefKeeper or FishDiary have ads?

FishDiary shows ads; ReefKeeper does not.

### Which is updated more often, ReefKeeper or FishDiary?

ReefKeeper ships an update weekly, and FishDiary monthly. Most recently, ReefKeeper was updated on October 31, 2026 and FishDiary 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.*