I built a little tool that lets you subscribe to posts, comments and users and get notified when they change.

It needs an account on val.town, but that's about it.

Also note, for top stories it can get quite chaotic.

Cool! I built something similar to this but using cloudflare workers[1] + a val town cron[2].

[1] https://github.com/nbbaier/hn-notifier [2] https://www.val.town/x/nbbaier/hnNotifierCron