We work on https://usecodeflow.com, which is a way to capture the way code logically flows (especially used for new-hires to learn a new codebase). Feel free to email me in my profile if you want to chat!
Your website doesn't mention pricing at all before asking me to provide my github details. I dont know if the service will be free or I will be asked to pay until I provide my github credentials. My suggestion would be to add some info in the FAQs section.