# Expert System vs Meu Aquário

The clearest difference is in-app purchases: Expert System at none against Meu Aquário's 1. Expert System also leads on update cadence (every 2 weeks vs every 6 weeks). Meu Aquário's advantage is iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Meu Aquário sells 1 in-app purchase, starting at $0.99 per month. Expert System asks for nothing beyond the download.

Expert System ships an update every 2 weeks, Meu Aquário every 6 weeks. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Expert System | Meu Aquário |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 20.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 6 weeks |
| Monetization | — | Freemium |
| Size | 40 MB | 95 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Expert System](https://appshunter.io/developer/1650850302) | [Flemeg de Oliveira Amorim](https://appshunter.io/developer/1708906527) |

## What reviewers say

### Expert System

[App page](https://appshunter.io/ios/app/expert-system/id6443943386)

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

**In-app purchases:** none


### Meu Aquário

[App page](https://appshunter.io/ios/app/meu-aquario/id6467646586)

Manage your aquarium with AI-powered insights and parameter tracking. Document your aquatic life with photos, set maintenance tasks, and calculate costs. Share your aquarium with others through live links.

**Highlights:** AI-powered aquarium management, Parameter measurement, Photo gallery for fauna and flora, Maintenance task scheduling, Cost calculator, Live sharing feature

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-free Basic Plan | $0.99 | per month |


## Frequently asked questions

### Is Expert System free?

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

### Is Meu Aquário free?

Meu Aquário is free to download, with in-app purchases available.

### Do Expert System or Meu Aquário have ads?

Neither Expert System nor Meu Aquário shows ads.

### Which is updated more often, Expert System or Meu Aquário?

Expert System ships an update every 2 weeks, and Meu Aquário every 6 weeks. Most recently, Expert System was updated on November 7, 2026 and Meu Aquário on November 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.*