Ask HN: Small product, single founder success stories?

Hi!

I somehow stumbled upon a previous 2011 thread [^1]. It was fascinating and quite inspiring. It also got me wondering, considering the mobile apps gold rush seems over, and SaaS has exploded. What new stories do you have to tell ?

To quote the original poster, "Can you share some stories/links even though it has been shared before on an unrelated thread?"

Have a great day everyone!