I am working on SaaS DocsApp (https://www.docsapp.io/) solo and bootstrapped. DocsApp is a platform to manage your product documentation. DocsApp now is profitable and growing. Currently I am focusing on marketing to grow more. DocsApp was born as a result of frustration to building documentation for Product/SaaS.

I have been working on DocsApp for 3 years and only now start profitable. The hardest problem I faced was marketing and sales. Development is only 30% of the work.