# GMT Cards vs DMR User Database

The clearest difference is update cadence: GMT Cards at monthly against DMR User Database's every 3 months. 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.

GMT Cards ships an update monthly, DMR User Database every 3 months. The most recent releases landed on September 16, 2026 and August 12, 2026 respectively.

## The numbers

| Metric | GMT Cards | DMR User Database |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/dmr-user-database/id6749166551/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | — | Free |
| Size | 2 MB | 28 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad, Mac, Apple Watch | iPhone, iPad, iPod, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Sergii Yefisko](https://appshunter.io/developer/1032305922) | [Andreas Krenz](https://appshunter.io/developer/1829006949) |

## What reviewers say

### GMT Cards

[App page](https://appshunter.io/ios/app/gmt-cards/id6466297488)

**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 GMT Cards free?

GMT Cards 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 GMT Cards or DMR User Database have ads?

Neither GMT Cards nor DMR User Database shows ads.

### Which is updated more often, GMT Cards or DMR User Database?

GMT Cards ships an update monthly, and DMR User Database every 3 months. Most recently, GMT Cards was updated on September 16, 2026 and DMR User Database on August 12, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*