# Dipper水族系统 vs Reef Guard

The clearest difference is in-app purchases: Dipper水族系统 at none against Reef Guard's 2. Reef Guard's advantage is update cadence (fortnightly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Reef Guard sells 2 in-app purchases, starting at $1.99 per month. Dipper水族系统 asks for nothing beyond the download.

Dipper水族系统 ships an update every 2 months, Reef Guard fortnightly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Dipper水族系统 | Reef Guard |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Size | 36 MB | 40 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [丽辉 王](https://appshunter.io/developer/1629156920) | [宇 郭](https://appshunter.io/developer/1851353253) |

## What reviewers say

### Dipper水族系统

[App page](https://appshunter.io/ios/app/dipper/id6670388006)

**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 Dipper水族系统 free?

Dipper水族系统 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 Dipper水族系统 or Reef Guard have ads?

Neither Dipper水族系统 nor Reef Guard shows ads.

### Which is updated more often, Dipper水族系统 or Reef Guard?

Dipper水族系统 ships an update every 2 months, and Reef Guard fortnightly. Most recently, Dipper水族系统 was updated on October 24, 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.*