EE-Digger,
You are not the first, and will not be the last, to find some Chinese Thermal Camera Dongle APPs underwhelming in terms of features, function and bug fixes ! Sadly it is an all too common situation. There seems to be the required effort and investment in developing decent quality hardware but the software development team let the side down. I have worked with some Chinese companies and there can be an attitude of “working is good enough” with no effort to improve the software or fix minor bugs in it. I was once asked to test some thermal imaging equipment and reported all of the issues with it and the accompanying software. The manufacture said “Thank you, we will fix all those issues in the next product as we have ceased development of this one”. An all too common situation. A product is developed with a BoM limit and release timeline. Once that project is delivered, the development budget is closed and the development of a new product is started

This is why I smile when I see adverts for many Chinese products claiming that the firmware may be updated by the user. Yep, it can, if only the manufacturer ever released such firmware updates ! This is a generalisation and a few Chinese manufacturers are more committed to their products and customers. HTi is not one of them !
I worked with DianYang Technology on their PCB Thermal Analysis system called the CA-10. It is basically a 256x192 pixel 25fps Infiray S0 thermal imaging core feeding it’s output to either a mobile phone or a PC/Tablet. The imaging core is capable of doing its job well but it needs equally good software to be a useful tool for PCB thermal inspection and profiling. DYT realised this and spent a lot of time and effort developing both the hardware and the all important Analysis software. The Analysis software is called SpectrumOwl and it comes in the standard (V1.x) and Professional (V2.x) versions. Which version you can use depends upon the model of hardware purchased. The software was well developed by the time I tested it but I was so pleased to hear a DYT team member tell me that they were not leaving it there and would be fixing any bugs as well as further development after feedback from end users. This attitude was a breath of fresh air for me when dealing with a Chinese thermal imaging company.
As we have seen in many products coming out of China, sometimes not enough of the project budget was spent on the software development or they ran out of budget before development could be fully completed, resulting in a half baked solution being released on the public. We have seen this situation with Hantek PC controlled test equipment and firmware. Basically it is released before being fully fit for purpose and no fixes are forthcoming.
We must also consider another factor when it comes to thermal imaging cameras and mobile phone dongles…. That is the question of who is the true OEM and does the badge engineering company that sells the product have any expertise or quality support in place for the product that they did not make ? So often a company cannot offer any meaningful support because they just bought-in a hardware & software solution and rely upon the OEM for any technical support or software updates. If the OEM is unwilling to offer decent support, the company that placed their branding on the product is basically useless to the end user when it comes to answering technical queries and issuing updates. I have met this a lot in the thermal imaging camera market.
As has been said before by me, these thermal imaging Dongles are similar to Software Defined Radio in that the clever “front end” hardware relies on the Software engineers skills in coding when it comes to the end products performance. Hardware quality is only half of the story and a great hardware platform can fail due to inadequate software development. As we all know, developing quality, efficient software code requires skilled coders and investment if man hours to do the job right. Not just grafting together sample software routines to create something that kind of works, as I have seen with some products that were little more than the re-engineering of an OEM development Board and it’s evaluation software !
Some time ago the Thermal Expert was well thought of. I wonder if that is an alternative to the HT301 ?
Fraser