We’re definitely considering this! We’re running a variety of tests right now to decide exactly how we’ll be offering Splitwise Pro (pay-what-you-want, fixed cost, etc).Lobo commented
I don't like the idea of subscribing via unknown (at least to me) third party services like Stripe. I'd take it if there is monthly subscription via paypal or google wallet. I'm ok with paying once a year and getting a yearly reminder. This way you know for sure that I will stick with you for one more year. ;-)
I like pay what you want idea, but if it doesn't bring you enough... you can throw in a minimum, which is not too high, amount in pay what you want model.
I don't really want Pro features, but I'd still like to pay you guys. heading over to paypal...
We just added a very basic calculator function to our web app, so you can now use basic mathematical operations when entering a cost (addition, subtraction, multiplication, and division). We hope to add similar features to our mobile apps at some point in the future!Lobo commented
I want this feature as well. This might not seem like a great feature but this is cool and helps the end user a lot. When I have to take out items that only belongs to me or when I enter itemized bills, I miss this feature so much. Just + and - should be a good start. * and / will need a little thinking because of operator precedence.