# CASSY App vs rClass

The clearest difference is update cadence: rClass at every 5 weeks against CASSY App's every 3 months. CASSY App's advantage is iOS requirement (15.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

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

CASSY App ships an update every 3 months, rClass every 5 weeks. The most recent releases landed on October 17, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | CASSY App | rClass |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Free | — |
| Size | 74 MB | 6 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [LD DIDACTIC GmbH](https://appshunter.io/developer/1083056850) | [TANO TRADING OOD LTD](https://appshunter.io/developer/1873334641) |

## 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

**In-app purchases:** none


### rClass

[App page](https://appshunter.io/ios/app/rclass/id6759010190)

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

**In-app purchases:** none


## Frequently asked questions

### Is CASSY App free?

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

### Is rClass free?

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

### Do CASSY App or rClass have ads?

Neither CASSY App nor rClass shows ads.

### Which is updated more often, CASSY App or rClass?

CASSY App ships an update every 3 months, and rClass every 5 weeks. Most recently, CASSY App was updated on October 17, 2026 and rClass on September 21, 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.*