Notebook.ai is what I use. The free version has plenty to use and overall has helped me a lot. Source: over 1 year ago

For stuff that involves more worldbuilding I use notebook.ai. Source: almost 2 years ago

You could give notebook.ai a try, they support self hosting: https://github.com/indentlabs/notebook. Source: about 2 years ago

I've looked into google docs (ok, but managing between multiple docs is annoying and pulling up references is a pain), notebook.ai (doesnt seem to have simultaneous real-time editing for the writing). Source: about 2 years ago

Hello! I've found this one really great site, called notebook.ai ! I really really like it, but unfortunately there is a paywall to access all of the content. so, I was wondering if anyone here has some alternatives that may help? Thank you!! Source: about 2 years ago

Zero to Sold is worth a read. https://thebootstrappedfounder.com/zero-to-sold/. Source: over 2 years ago

I recommend to read the book Zero to Sold where he talk about the idea validation part, that should help you. Source: about 3 years ago

Since then, Arvid has been sharing his learnings on his blog and with his Twitter audience that he grew from 400 to over 22.000. He wrote a book about the FeedbackPanda journey (Zero to Sold) and another one about the audience-building journey (The Embedded Entrepreneur). Source: about 3 years ago