# Useful QR Code Reader PRO vs Aquarium Tracker

The clearest difference is price: Aquarium Tracker at Free against Useful QR Code Reader PRO's $2.99. Aquarium Tracker also leads on update cadence (daily vs every 9 days). Useful QR Code Reader PRO's advantage is iOS requirement (15.6 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Aquarium Tracker is free to download; Useful QR Code Reader PRO costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Useful QR Code Reader PRO ships an update every 9 days, Aquarium Tracker daily. The most recent releases landed on September 20, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Useful QR Code Reader PRO | Aquarium Tracker |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/aquarium-tracker-fish-tank/id6762288109/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 days | **Daily** |
| Monetization | — | Free |
| Size | 39 MB | 38 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [katapu.net](https://appshunter.io/developer/381898924) | [Maxime Lang](https://appshunter.io/developer/1878824433) |

## What reviewers say

### Useful QR Code Reader PRO

[App page](https://appshunter.io/ios/app/useful-qr-code-reader-pro/id6738622977)

**Features:** macOS Compatibility

**In-app purchases:** none


### Aquarium Tracker

[App page](https://appshunter.io/ios/app/aquarium-tracker-fish-tank/id6762288109)

Monitor your aquarium's water quality with detailed tracking and smart alerts. Identify fish species from photos, check compatibility, and get reminders for essential maintenance to keep your aquatic life healthy.

**Highlights:** Water parameter logging (pH, ammonia, nitrate, etc.), Smart alerts for critical water values, AI-powered fish species identification, Fish compatibility checker, Nitrogen cycle guide for beginners, Maintenance reminders (water changes, testing), Private, no account required

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

**In-app purchases:** none


## Frequently asked questions

### Is Useful QR Code Reader PRO free?

Useful QR Code Reader PRO costs $2.99, with no in-app purchases.

### Is Aquarium Tracker free?

Aquarium Tracker is free to download, with no in-app purchases.

### Do Useful QR Code Reader PRO or Aquarium Tracker have ads?

Neither Useful QR Code Reader PRO nor Aquarium Tracker shows ads.

### Which is updated more often, Useful QR Code Reader PRO or Aquarium Tracker?

Useful QR Code Reader PRO ships an update every 9 days, and Aquarium Tracker daily. Most recently, Useful QR Code Reader PRO was updated on September 20, 2026 and Aquarium Tracker on September 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.*