The HipChat Windows client misses a lot of marks (have you used it on a HiDPI screen?), and the web client has some missing usability. I created this app in order to address those issues.
This is a fully functional, beautifully scaling, HipChat client.
Note: This app is not associated with the real HipChat client or Atlassian in any way. It is just my frustrated attempt at having a good client for a service that I need to use for work.