# QS/1 Message Center vs DMR User Database

The clearest difference is update cadence: QS/1 Message Center at every 3 weeks against DMR User Database's every 3 months. QS/1 Message Center also leads on iOS requirement (10.0 vs 15.0). DMR User Database's advantage is device support (4 vs 2). On price, 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.

QS/1 Message Center ships an update every 3 weeks, DMR User Database every 3 months. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | QS/1 Message Center | DMR User Database |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (2 ratings)](https://appshunter.io/ios/app/dmr-user-database/id6749166551/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | — | Free |
| Size | 48 MB | 28 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [RedSail Technologies, LLC](https://appshunter.io/developer/1515336618) | [Andreas Krenz](https://appshunter.io/developer/1829006949) |

## What reviewers say

### QS/1 Message Center

[App page](https://appshunter.io/ios/app/qs1-message-center/id1344865921)

**Features:** macOS Compatibility

**In-app purchases:** none


### DMR User Database

[App page](https://appshunter.io/ios/app/dmr-user-database/id6749166551)

This app serves as a comprehensive digital phonebook for the Digital Mobile Radio (DMR) community. It allows users to quickly search for Radio IDs, Callsigns, and other user details across multiple integrated databases. Ideal for ham radio operators, it facilitates connections and exploration within the digital radio world.

**Highlights:** Comprehensive search by ID, Callsign, Name, or Location, Integrates multiple DMR databases, View users per country, Built-in logbook for radio contacts, Database export for specific devices, Interactive maps for repeaters, Offline functionality

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is QS/1 Message Center free?

QS/1 Message Center is free to download, with no in-app purchases.

### Is DMR User Database free?

DMR User Database is free to download, with no in-app purchases.

### Do QS/1 Message Center or DMR User Database have ads?

Neither QS/1 Message Center nor DMR User Database shows ads.

### Which is updated more often, QS/1 Message Center or DMR User Database?

QS/1 Message Center ships an update every 3 weeks, and DMR User Database every 3 months. Most recently, QS/1 Message Center was updated on October 26, 2026 and DMR User Database on October 30, 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.*