Show HN: NotifyOn – A simple way to notify users when long agent tasks finish (opens in new tab)

Thanks to AI, it feels like every agent workflow I build gets longer and longer. What used to be a few seconds is now often many minutes, and I've got some that can run for close to an hour.

No user is going to sit and watch the agent working for that long. They'll switch to other tabs or just leave. When the task is finally done, it's showing the results to an empty browser tab.

I wanted a simple way to bring them back, without the complexity of a full-blown notification system. So I built this: an API to send a "just right" notification when a task is complete. It can be a browser sound for shorter waits, or a browser push/email for the really long ones.

It's a side project born from this pain point. The goal is to be the simplest possible tool for this one job.

The website: https://notifyon.app

I'd love to get your feedback.