[dregitsky]

With restaurant bills, things get rather complicated when everyone orders different items, someone bought a Groupon, etc. Unless people are OK with over/under paying, a bill splitting app can be pretty useful to figure out what everyone actually owes.

Cash works well when everyone has it, but from what I've seen that doesn't happen all that often. Also, you get a lot of restaurants that refuse to itemize the bill (maybe their point of sale system doesn't support it), and sometimes they'll only take 1 credit card. Integration with payment apps is great for that. It goes beyond saving time...an app can help make sure people pay up and the IOUs don't become permanent.

Disclosure: I recently released Grouptuity (https://play.google.com/store/apps/details?id=com.grouptuity), which tries to solve these problems and integrates with Venmo.

[mgkimsal]

Usually, there's a minimum charge ('gratuity') for parties of 6 or 8 or more, so they better damn well split the bills for us. I've had it be a problem twice in the past 6 years of dining out, and once was sort of my own doing (we had a party of 24 on a Friday night - I just paid it as a single thing vs having everyone split it up - it was an unusual event). The other time it happened was a party of 5 and the server refused to split up the bill. We all chipped in something, but I don't go back there anymore.

Maybe it's a bigger problem in some areas of the world, but not mine.