Comparison

caQtDM vs BlueHHT

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

caQtDM

Features
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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.

About

BlueHHT

Features
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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

caQtDM4 screens
BlueHHT4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

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.

Scorecard2 real differences ยท 4 level
caQtDM versus BlueHHT: the parameters behind the verdict, then further details
ParametercaQtDMBlueHHT
PriceFreeFree
Update frequencyEvery 5 months โ€” betterEvery 12 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod โ€” better
Requires iOS16.013.0 โ€” better
Further details โ€” not scored
Size68 MB15 MB
Age rating4+4+
DeveloperHelge BrandsDohmann Engineering Services

In-app purchases

None

caQtDM

No in-app purchases

None

BlueHHT

No in-app purchases

Questions

Is caQtDM free?
caQtDM is free to download, with no in-app purchases.
Is BlueHHT free?
BlueHHT is free to download, with no in-app purchases.
Do caQtDM or BlueHHT have ads?
Neither caQtDM nor BlueHHT shows ads.
Which is updated more often, caQtDM or BlueHHT?
caQtDM ships an update every 5 months, and BlueHHT every 12 months. Most recently, caQtDM was updated on October 12, 2026 and BlueHHT on October 2, 2026.

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