# CASSY App vs LEIFIphysik

The clearest difference is update cadence: LEIFIphysik at monthly against CASSY App's every 3 months. On price, review sentiment, ads and in-app purchases 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, LEIFIphysik monthly. Both last shipped on October 24, 2026.

## The numbers

| Metric | CASSY App | LEIFIphysik |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **60.0% of reviews** | 55.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free | Free |
| Size | 76 MB | 45 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [LD DIDACTIC GmbH](https://appshunter.io/developer/1083056850) | [FWU Institut für Film und Bild in Wissenschaft und Unterricht gemeinnützige GmbH](https://appshunter.io/developer/1027361636) |

## 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


### LEIFIphysik

[App page](https://appshunter.io/ios/app/leifiphysik/id6466470177)

This app serves as a physics learning assistant for students from 5th grade through high school. It provides comprehensive content, exercises, and simulations aligned with school curricula, helping with homework, presentations, and exams. Users can track their progress and create personalized collections of topics.

**Highlights:** Physics content for grades 5-12, Homework and exam preparation, Interactive simulations, Knowledge quizzes, Personalized topic collections, Progress tracking, Curriculum-aligned learning

**Features:** macOS Compatibility, 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 LEIFIphysik free?

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

### Do CASSY App or LEIFIphysik have ads?

Neither CASSY App nor LEIFIphysik shows ads.

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

CASSY App ships an update every 3 months, and LEIFIphysik monthly. Most recently, CASSY App was updated on October 24, 2026 and LEIFIphysik on October 24, 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.*