caQtDM vs BlueHHT
Price, ratings, monetisation and update history for both apps, side by side โ 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.
BlueHHT
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BlueHHT is a virtual hand held terminal (HHT) for use with GSI's (Gauging Systems Inc.) tank gauging transmitters. It is able to configure and monitor GSI's APTB2, APTB3, and APTB3.6 transmitter cards via a wireless UART device. BlueHHT is not a general purpose hand held terminal emulator. It only supports the specific GSI devices described here. If you need a general purpose hand held terminal emulator, please refer to the BlueQTerm app.
Screenshots
Verdict
The clearest difference is update cadence: caQtDM at every 5 months against BlueHHT's every 12 months. BlueHHT's advantage is iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
caQtDM ships an update every 5 months, BlueHHT every 12 months. The most recent releases landed on October 12, 2026 and October 2, 2026 respectively.
| Parameter | caQtDM | BlueHHT |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 months โ better | Every 12 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad, iPod โ better |
| Requires iOS | 16.0 | 13.0 โ better |
| Further details โ not scored | ||
| Size | 68 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Helge Brands | Dohmann Engineering Services |
In-app purchases
caQtDM
No in-app purchases
BlueHHT
No in-app purchases









