# CASSY App vs Relution Parent

The clearest difference is review sentiment: CASSY App at 60% against Relution Parent's 0%. CASSY App also leads on update cadence (every 3 months vs every 10 months). Relution Parent's advantage is iOS requirement (13.0 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.

CASSY App ships an update every 3 months, Relution Parent every 10 months. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | CASSY App | Relution Parent |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **60.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 10 months |
| Monetization | Free | Free |
| Size | 76 MB | 38 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [LD DIDACTIC GmbH](https://appshunter.io/developer/1083056850) | [Relution GmbH](https://appshunter.io/developer/1593405154) |

## 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


### Relution Parent

[App page](https://appshunter.io/ios/app/relution-parent/id6477530198)

This app allows parents to manage their children's device usage, controlling which applications are accessible outside of school hours. It facilitates remote app selection and blocking, enhancing child protection in the digital world.

**Highlights:** Remote app management, App blocking and unblocking, Comprehensive device overview, Flexible control options, Data sovereignty and protection, Manage multiple children, Cross-school compatibility

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CASSY App free?

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

### Is Relution Parent free?

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

### Do CASSY App or Relution Parent have ads?

Neither CASSY App nor Relution Parent shows ads.

### Which is updated more often, CASSY App or Relution Parent?

CASSY App ships an update every 3 months, and Relution Parent every 10 months. Most recently, CASSY App was updated on November 2, 2026 and Relution Parent on November 4, 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.*