I'm working on ArkWatch (https://watch.arkforge.fr) - a monitoring API that you can use with just curl, no signup required.
The insight: most solo founders need basic "alert me when this changes" monitoring, but existing tools force you through signup flows, credit cards, dashboards you'll never use. So I made it dead simple:
That's it. It watches the URL and emails you when content changes. Free tier = 10 checks/day, which is enough for most side projects.
I built this because I kept forgetting to monitor my own stuff. Now it's live and I'm trying to get my first 5 beta testers. The challenge is marketing - I'm a developer, not a growth hacker. Learning as I go!
What's been your biggest challenge with your current project?