Hi from Pakistan, I build free tools and content sites in the pet niche

Hi everyone, I'm Usama. I run a couple of niche content sites for dog and cat owners, and I'm starting to build small free web tools (calculators and checkers) to add to them.

I joined Product Hunt to learn how other makers decide what to build, how they validate it before investing time, and how they launch with a very small audience.

I'd love to hear from other solo builders: what was the first small tool you built, and how did you find out people wanted it?

Looking forward to learning from you all.