let the user add values using a comma (,) as a separator.
We'd be happy if you considered to add to possibility to add values separated by a comma instead of a period as used in most of Europe as well as in South America and other Regions as shown in the map here: http://en.wikipedia.org/wiki/Decimal_mark

This should be how both the iPhone and Android app work at this point (please let us know if this is broken for you on either of those). We still have not fixed this issue on the website, though it is something we plan to do.
Marshall
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Robert G. commented
US way 1,234.56 = 1.234,56 (german way).
Right now I can not enter "4,56 Euro" as an amount -
Jonathan Zobro commented
I know this is quite an annoying problem to program, but it woukd really help the readability and usability of the Android app!
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Gersom commented
I'm really looking forward to this! Comma works on iPhone, but not on desktop.
Just added 10.23 to my list and because of using a comma it got translated into 1,023.00 (very annoying!)
Besides this problem Splitwise is really amazing! I will try to get as many Dutch friends to start using Splitwise instead of our widely known Dutch version www.wiebetaaltwat.nl (who pays what). It has no iPhone app...