Recently Stephen Flanigan from Therap Customer Support stated the following when asked about which devices are best for mobile data entry into Therap:

StephenTherap is designed to work on a number of web browsers that are java-compatible. We recommend Google Chrome, Mozilla Firefox or Internet Explorer as they are the largest used and therefore most tested browsers. Safari and Apple’s various iOS work well, as does lesser-used browsers such as Opera and Sea Monkey. Both the Kindle Fire and Android Tablet will work, although I haven’t personally tested on the Kindle Fire’s Amazon Silk web browser system, several users have on the Android Tablets without trouble.