I bought Tapatalk when it was 99 cents years ago...
...but, this specific forum software does look quite nice on my Android MotoX.
EDIT: Tapatalk has changed slightly since it came out several years ago. In general, either forum software on a handheld device is capable of using a reader like Tapatalk (or others...) or it's not needed, such as this specific forum software.
You need to check with those forums you utilize on a regular basis for the details. Hope that helps!