# Reef Book vs Reef Guard

The clearest difference is price: Reef Guard at Free against Reef Book's $5.99. Reef Guard also leads on update cadence (fortnightly vs every 6 months) and iOS requirement (13.0 vs 26.0). Reef Book's advantage is in-app purchases (none vs 2). On ads and device support there is nothing between them.

Reef Guard is free to download; Reef Book costs $5.99 up front. Reef Guard sells 2 in-app purchases, starting at $1.99 per month. Reef Book asks for nothing beyond the download.

Reef Book ships an update every 6 months, Reef Guard fortnightly. The most recent releases landed on September 18, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Reef Book | Reef Guard |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Fortnightly** |
| Size | 166 MB | 40 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ReefSoft LLC](https://appshunter.io/developer/1789068807) | [宇 郭](https://appshunter.io/developer/1851353253) |

## What reviewers say

### Reef Book

[App page](https://appshunter.io/ios/app/reef-book/id6740756140)

**Features:** iMessage stickers

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Reef Book free?

Reef Book costs $5.99, with no in-app purchases.

### Is Reef Guard free?

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

### Do Reef Book or Reef Guard have ads?

Neither Reef Book nor Reef Guard shows ads.

### Which is updated more often, Reef Book or Reef Guard?

Reef Book ships an update every 6 months, and Reef Guard fortnightly. Most recently, Reef Book was updated on September 18, 2026 and Reef Guard on October 1, 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.*