First let me say congratulations on the side project that makes $$. You are doing something that some people, me :-( , can't seem to figure out (or have too much paralysis by analysis, me again)
So my question is genuine and not meant to take away from what you have created or accomplished:
How are products like this still making money when there are tons of alternatives and some of them free?
Thank you! Try and build something that scratches an itch of yours, and launch ASAP so you can begin gathering feedback. That way, you avoid overthinking!
And that's a great question! There are heaps of great alternatives, but they didn't solve my needs. So I built my own take on a great timer, and it turns out other people were looking for the same thing!
It's taught me a lot about the non-technical side of building a product. Very fulfilling from a personal growth perspective.