# OSS Messenger vs LUMIS

OSS Messenger and LUMIS are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | OSS Messenger | LUMIS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | — |
| Monetization | Free | — |
| Size | 52 MB | 75 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sdui GmbH](https://appshunter.io/developer/1034926222) | [Lars- und Christian Engel Stiftung](https://appshunter.io/developer/1667844589) |

## What reviewers say

### OSS Messenger

[App page](https://appshunter.io/ios/app/oss-messenger/id1618783644)

This app facilitates secure and mobile communication for teachers, students, and parents within the Saarland education system. It enables direct messages, group chats, voice messages, video conferences, and translation features to enhance school-wide communication.

**Highlights:** Secure messaging, Group and voice messages, Video conferences, Translation feature, Surveys and polls, Read receipts, Customizable availability times

**Features:** Vision Pro support

**In-app purchases:** none


### LUMIS

[App page](https://appshunter.io/ios/app/lumis/id6449938363)

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

**In-app purchases:** none


## Frequently asked questions

### Is OSS Messenger free?

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

### Is LUMIS free?

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

### Do OSS Messenger or LUMIS have ads?

Neither OSS Messenger nor LUMIS 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.*