# MOAI® vs Reef Diary Aquarium Management

The clearest difference is in-app purchases: MOAI® at none against Reef Diary Aquarium Management's 4. MOAI® also leads on iOS requirement (9.0 vs 15.1). Reef Diary Aquarium Management's advantage is update cadence (every 5 weeks vs every 10 months) and device support (4 vs 2). On price and ads there is nothing between them.

Both are free to download. Reef Diary Aquarium Management sells 4 in-app purchases, starting at $2.99 per month. MOAI® asks for nothing beyond the download.

MOAI® ships an update every 10 months, Reef Diary Aquarium Management every 5 weeks. The most recent releases landed on September 12, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | MOAI® | Reef Diary Aquarium Management |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/reef-diary-aquarium-management/id6746352304/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 5 weeks** |
| Monetization | — | Freemium |
| Size | 51 MB | 57 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [SZ MOAI TECHNOLOGY CO., LTD](https://appshunter.io/developer/1649077706) | [Christian Buchholz](https://appshunter.io/developer/1816370032) |

## What reviewers say

### MOAI®

[App page](https://appshunter.io/ios/app/moai/id6443755461)

**Features:** macOS Compatibility

**In-app purchases:** none


### Reef Diary Aquarium Management

[App page](https://appshunter.io/ios/app/reef-diary-aquarium-management/id6746352304)

Manage your reef or freshwater aquarium with this comprehensive tool. Track water parameters, schedule maintenance, and monitor your aquatic life and equipment. Works offline to keep your ecosystem healthy and thriving.

**Highlights:** Smart parameter tracking for reef and freshwater, Visual trend charts for water parameters, Multiple tank support, Equipment and livestock inventory, Maintenance task scheduler with reminders, Offline functionality

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reef Diary - Monthly | $2.99 | per month |
| Reef Diary - Yearly | $24.99 | per year |
| Enterprise Monthly Subscription | $89.99 | per month |
| ReefDiary Yearly Enterprise | $699.00 | per year |


## Frequently asked questions

### Is MOAI® free?

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

### Is Reef Diary Aquarium Management free?

Reef Diary Aquarium Management is free to download, with in-app purchases available.

### Do MOAI® or Reef Diary Aquarium Management have ads?

Neither MOAI® nor Reef Diary Aquarium Management shows ads.

### Which is updated more often, MOAI® or Reef Diary Aquarium Management?

MOAI® ships an update every 10 months, and Reef Diary Aquarium Management every 5 weeks. Most recently, MOAI® was updated on September 12, 2026 and Reef Diary Aquarium Management on September 3, 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.*