Due to issues with Google Play policies, it can no longer be found on Google Play,
https://thermviewer.com On the website, it can still be downloaded and used. I know that the app has compatibility issues with many new phones, and whether it is usable or not requires actual testing. I personally do not have many testing conditions.
I think the app may be re launched on Google Play in the future, which may require the use of a new toolchain for redevelopment and compilation to meet the requirements. This requires a certain amount of work, not only for ThermApp, but also for other models of infrared cameras.