# CASSY App vs AR.X Optics

The clearest difference is review sentiment: AR.X Optics at 75% against CASSY App's 60%. AR.X Optics also leads on iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | CASSY App | AR.X Optics |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 60.0% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | Free |
| Size | 76 MB | 189 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [LD DIDACTIC GmbH](https://appshunter.io/developer/1083056850) | [Johannes Gutenberg-Universität Mainz](https://appshunter.io/developer/877501807) |

## What reviewers say

### CASSY App

[App page](https://appshunter.io/ios/app/cassy-app/id1083056851)

Control scientific measurement devices and display data on your mobile device. Analyze, store, and share results without a PC. Supports a wide range of physics, chemistry, and biology sensors.

**Highlights:** Control CASSY devices, Display measurements (analog/digital, tables, diagrams), Evaluate and store data, Share results wirelessly, Support for physics, chemistry, and biology sensors, WebDAV server integration

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

**In-app purchases:** none


### AR.X Optics

[App page](https://appshunter.io/ios/app/arx-optics/id1613699573)

This app uses augmented reality to overlay virtual objects onto real-world environments, transforming placeholder cards into interactive science experiments. It currently focuses on optics, allowing users to explore concepts like lasers, mirrors, and lenses with accurate physical modeling.

**Highlights:** Augmented reality for virtual object overlay, Interactive science experiment simulations, Focus on optics (lasers, mirrors, lenses), Accurate physical modeling of phenomena, Use of placeholder cards for AR activation

**In-app purchases:** none


## Frequently asked questions

### Is CASSY App free?

CASSY App is free to download, with no in-app purchases.

### Is AR.X Optics free?

AR.X Optics is free to download, with no in-app purchases.

### Do CASSY App or AR.X Optics have ads?

Neither CASSY App nor AR.X Optics shows ads.

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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.*