I believe you can create a shortcut to TDPRI on IOS or Android and save it to the home screen.
That is what I do. I do believe the old TDPRI app was nothing more than a web wrapper???
There's no application for TDPRI or any of the sister sites. The TDPRI site is very adaptive to mobile screens, so there's no pressing need for an alternative. Honestly, all that an app would be good for is monitoring how you use it and gathering info for serving you ads.