I use AWS EC2 for various side projects and experiments. A while back, I forgot to shut down an instance and didn’t realize until I got a pretty hefty bill at the end of the month.

To avoid this in the future, I built a simple CLI tool called Autostopper. It automatically stops your EC2 instances after a set duration, so you don't have to worry about leaving them running longer than you need. It’s free and open source, and I figured others might find it useful too.