HN discussion: https://news.ycombinator.com/item?id=41404064
Similar tools:
https://github.com/dividuum/html-vault
https://github.com/MaxLaumeister/PageCrypt
https://github.com/a-nau/password-protected-website-template
https://github.com/sowbug/quaid
https://github.com/mprimi/portable-secret
Thanks to @refalo@programming.dev
It depends what static refers to. In this case, it refers to static file creation without PHP (or Python) on the server. The content itself can stay static, JavaScript and its dynamic nature is just used to encrypt and decrypt.