# 积光 vs Reef Guard

The clearest difference is in-app purchases: 积光 at none against Reef Guard's 2. 积光 also leads on iOS requirement (9.0 vs 13.0). Reef Guard's advantage is update cadence (fortnightly vs monthly). On price, 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. 积光 asks for nothing beyond the download.

积光 ships an update monthly, Reef Guard fortnightly. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 积光 | Reef Guard |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Size | 69 MB | 40 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HUNDSUN TECHNOLOGIES INC](https://appshunter.io/developer/384365724) | [宇 郭](https://appshunter.io/developer/1851353253) |

## What reviewers say

### 积光

[App page](https://appshunter.io/ios/app/id1287823960)

**Features:** macOS Compatibility

**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 积光 free?

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

### Is Reef Guard free?

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

### Do 积光 or Reef Guard have ads?

Neither 积光 nor Reef Guard shows ads.

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

积光 ships an update monthly, and Reef Guard fortnightly. Most recently, 积光 was updated on October 26, 2026 and Reef Guard 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.*