caQtDM vs Directory Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
caQtDM
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The EPICS display manager MEDM is a very powerful tool with many features and satisfies most of the needs for synoptic displays. However MEDM is based on MOTIF/Xt and X11, systems/libraries that are getting into age. Moreover applications using those systems are difficult to maintain and to extend. At PSI a new Qt based application was written, reproducing the functionality of MEDM. Moreover a parser was written to convert the MEDM files into Qt files, the resulting displays being an exact reproduction of the MEDM displays. It has to be noticed that the widgets used are not directly epics aware. The idea was to strictly separate the control system from the display part, in order to be able to add other controlsystems if necesssary (which is still the case for our high intensity particle accelerator). An application is never finished and can always be improved and new things can be added. This is therefore also the case for caQtDM. The widgets could be improved, not everything has been finished and bugs will be found. This App is directly build out of the same sources like the linux/mac or windows version with the help of Qt. For using it a http server with the configuration files (network/gateway/environment) and display files is needed.
Directory Viewer
Easily view file and directory lists generated on your computer. This utility app supports files created on Windows, Mac, or Linux, offering a clean, redesigned interface with bookmarking and saved file features.
- View directory and file lists
- Supports Windows, Mac, Linux files
- New design interface
- Bookmarks
- Saved files
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With this viewer you can view a file list of directories and files. You can generate this list on your Windows, Mac or Linux, and view this text file from this app. The app has been updated with new design. Previous design used a web based viewer, and now it has been redesigned to a new design code with Bookmarks and Saved Files.
Screenshots
Verdict
The clearest difference is price: caQtDM at Free against Directory Viewer's $0.99. caQtDM also leads on iOS requirement (16.0 vs 18.0). Directory Viewer's advantage is update cadence (monthly vs every 5 months). On ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
caQtDM is free to download; Directory Viewer costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
caQtDM ships an update every 5 months, Directory Viewer monthly. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.
| Parameter | caQtDM | Directory Viewer |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 5 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 68 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Helge Brands | Mohit Khanna |
In-app purchases
caQtDM
No in-app purchases
Directory Viewer
No in-app purchases









