# Reef Diary Aquarium Management vs ReefAI3

The clearest difference is price: Reef Diary Aquarium Management at Free against ReefAI3's $1.99. ReefAI3's advantage is in-app purchases (none vs 4) and update cadence (every 2 days vs monthly). On ads, device support and iOS requirement there is nothing between them.

Reef Diary Aquarium Management is free to download; ReefAI3 costs $1.99 up front. Reef Diary Aquarium Management sells 4 in-app purchases, starting at $2.99 per month. ReefAI3 asks for nothing beyond the download.

Reef Diary Aquarium Management ships an update monthly, ReefAI3 every 2 days. The most recent releases landed on October 4, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Reef Diary Aquarium Management | ReefAI3 |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Freemium | — |
| Size | 58 MB | 30 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Christian Buchholz](https://appshunter.io/developer/1816370032) | [Austin Lamitina](https://appshunter.io/developer/1884142429) |

## What reviewers say

### 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 |


### ReefAI3

[App page](https://appshunter.io/ios/app/reefai3/id6764714629)

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

**In-app purchases:** none


## Frequently asked questions

### Is Reef Diary Aquarium Management free?

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

### Is ReefAI3 free?

ReefAI3 costs $1.99, with no in-app purchases.

### Do Reef Diary Aquarium Management or ReefAI3 have ads?

Neither Reef Diary Aquarium Management nor ReefAI3 shows ads.

### Which is updated more often, Reef Diary Aquarium Management or ReefAI3?

Reef Diary Aquarium Management ships an update monthly, and ReefAI3 every 2 days. Most recently, Reef Diary Aquarium Management was updated on October 4, 2026 and ReefAI3 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.*