Ask HN: Most interesting tech you built for just yourself?

My family has historically been very into genealogy research, so we've got lots of family tree info. I've been working with my aunt to put together a webapp to create/edit info, see relationships, show ancestors/descendants of individuals. We've also started adding photos recently, which is really cool.

Favorite feature we've built: "are you my cousin", where you choose 2 people in our database and it calculates how they are related. First time I got to write a search function outside of a classroom!

I'm sure Ancestry does all this and more, but it's nice to have something that we built that's just for our family. We also use it all the time to verify relationships/birthdays!

Do you have/do you plan to open source this anywhere? I'd be really interested in checking it out!

I've not put a ton of thought into a plan to open source it, but we've got comments from friends who also have a lot of genealogical info that it would be super helpful for their info, so maybe? It's basically just a CRUD Django app at it's core, so I don't know how interesting it would be.

I think a lot of people would be into this. If you're willing to, you should totally do it! You might get some good contributions from the community, too.