# Quantum Aqua vs Fish Disease Identifier

The clearest difference is in-app purchases: Quantum Aqua at none against Fish Disease Identifier's 2. Quantum Aqua also leads on iOS requirement (13.0 vs 15.1). Fish Disease Identifier's advantage is update cadence (weekly vs every 4 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Fish Disease Identifier sells 2 in-app purchases, starting at $4.99 per 7 days. Quantum Aqua asks for nothing beyond the download.

Quantum Aqua ships an update every 4 weeks, Fish Disease Identifier weekly. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Quantum Aqua | Fish Disease Identifier |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Weekly** |
| Size | 187 MB | 40 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Jordan Kambanis](https://appshunter.io/developer/1744286099) | [Szymon Niemiec](https://appshunter.io/developer/1853026562) |

## What reviewers say

### Quantum Aqua

[App page](https://appshunter.io/ios/app/quantum-aqua/id6502040629)

**Features:** macOS Compatibility

**In-app purchases:** none


### Fish Disease Identifier

[App page](https://appshunter.io/ios/app/fish-disease-identifier/id6761323697)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | per 7 days |
| Premium | $29.99 | per year |


## Frequently asked questions

### Is Quantum Aqua free?

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

### Is Fish Disease Identifier free?

Fish Disease Identifier is free to download, with in-app purchases available.

### Do Quantum Aqua or Fish Disease Identifier have ads?

Neither Quantum Aqua nor Fish Disease Identifier shows ads.

### Which is updated more often, Quantum Aqua or Fish Disease Identifier?

Quantum Aqua ships an update every 4 weeks, and Fish Disease Identifier weekly. Most recently, Quantum Aqua was updated on October 3, 2026 and Fish Disease Identifier on October 9, 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.*