Stop changing your UI
If you guys really think your UI is very cool let me tell you ..it's the most pathetic thing to constantly keep changing UI . Playing around with HTML and CSS does not make your app attractive. Stop changing theme you guys are not a big company like facebook that people will keep using it irrespective of whatever u do.

Thanks so much for your patience and feedback as we improve things.
We try not to update our UI unnecessarily, but in this case, we think it was worth it. The last big change to our interface was almost a year ago (the recent “Add a bill” changes were part of a preview of this release), and since then we’ve spent a lot of time getting feedback from users about what they like, what they don’t like, and what they find confusing.
This new design is an attempt to make things clearer, friendlier, and easier to use, both for new users and existing users. We may have inadvertently made some parts of Splitwise harder to use, and if so, we apologize – if you have specific issues, we’re always happy to hear about them and see if there is a way to address them.
Thanks again for your patience – we are still a very young service and we are trying to make constant improvements.
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Himanshu Sharma commented
It's one of the best UI I have ever seen! Keep up the great work!!!