Expectorant is online for all your stochastic bill splitting and repayment needs: expectorant.yootl.es.
Read more about it there.
2025-10-31: Bugfix with leading zeros causing numbers to get parsed as octal 2025-10-30: Some little tweaks like hover text and improve the README 2025-03-15: Play w/ easter egg salad and get off Replit 2022-12-30: Easter egg salad, long story 2022-12-29: Lots of fussing and tweaking 2022-12-23: Better rounding and other polishing 2022-12-21: Polished up, better colors, better easing function for the spinner 2022-12-04: A spinner! 2022-10-23: Lets you enter a probability but doesn't do anything with it 2017-08-05: Dummy version on Glitch 2012-07-17: Messy Matters post 2011-02-07: Last update of the Android app on Google Play 2010-05-10: Android app released on whatever Google Play was called back then
New name idea: Bernoullinator? Cuz it does Bernoulli trials? Then instead of "expectorize" it'd be "bernoullinate". Pretty fun to say! But it seems "Expectorant" was pretty sticky, so to speak.
Idea: If you enter a list of things with probabilities or weights, it makes a multi-outcome spinner for them. You could even make the restaurant bill-splitting algorithm intuitive for normal people by picking a couple entrees and spinning between them plus a big slice of the pie chart for "everything else". Like for a $300 restaurant bill including a $25 steak and a $50 bottle of wine, you could enter something like: [steak:25/300, wine:50/300, misc:(300-50-25)/300] and then if misc wins, you effectively zoom in on that pie slice and repeat with a few more items from the bill, using the remaining subtotal as the denominator.
I guess really the restaurnt bill splitting use case just wants a whole dedicated UI where you're prompted for the subtotal plus as many easy-to-identify items on the bill as you care to specify. Then you get a spinner and if the "misc" option comes up, the previously identified items are crossed out, the remaining subtotal is shown, and you're prompted to identify more items from the bill. Repeat till an explicitly identified item is chosen so whoever got that item can pay the whole bill.
