Drop in your contacts and see which area codes your phone book grew up in, without anything leaving your browser

Reads a contacts file or pasted numbers locally, reduces them to a count per North American area code and lights up a map with stats like your farthest-from-home code. Three sample people let you try it without any of your own data.

Notes

North America only. Has a Buy Me a Coffee link. Maker says in the HN post he finally 'threw an LLM at' a ten-year-old idea; the page doesn't mention AI.