This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
Post
athingper.day
did:plc:nwb5ffey4nftliygiikuwvwq
I made a blood type calculator that deduces what some family members' blood types must be given the blood types of other people in the family. It's not perfect at inferring all possible information yet, but it can infer some interesting things.
athingper.day/9
2026-01-21T01:20:32.935Z