# Reef Guard vs 鱼缸笔记

The clearest difference is in-app purchases: 鱼缸笔记 at none against Reef Guard's 2. Reef Guard's advantage is iOS requirement (13.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Reef Guard sells 2 in-app purchases, starting at $1.99 per month. 鱼缸笔记 asks for nothing beyond the download.

Reef Guard ships an update fortnightly, 鱼缸笔记 weekly. The most recent releases landed on October 30, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Reef Guard | 鱼缸笔记 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Size | 40 MB | 39 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [宇 郭](https://appshunter.io/developer/1851353253) | [常松 逯](https://appshunter.io/developer/1566768972) |

## What reviewers say

### Reef Guard

[App page](https://appshunter.io/ios/app/reef-guard/id6755100588)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reef Guard Pro Monthly | $1.99 | per month |
| Reef Guard Pro Yearly | $19.99 | per year |


### 鱼缸笔记

[App page](https://appshunter.io/ios/app/id6812259676)

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

**In-app purchases:** none


## Frequently asked questions

### Is Reef Guard free?

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

### Is 鱼缸笔记 free?

鱼缸笔记 is free to download, with no in-app purchases.

### Do Reef Guard or 鱼缸笔记 have ads?

Neither Reef Guard nor 鱼缸笔记 shows ads.

### Which is updated more often, Reef Guard or 鱼缸笔记?

Reef Guard ships an update fortnightly, and 鱼缸笔记 weekly. Most recently, Reef Guard was updated on October 30, 2026 and 鱼缸笔记 on November 6, 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.*