[Timon3]

I've long been wishing for the same! With service workers etc. this would be a perfect approach for many small utilities. I've started building things as single HTML files using vite-plugin-singlefile[0], but users either have to manually block network requests, or they have to trust me. It would be awesome if they could be sure that nothing will be uploaded anywhere.

The pledge would have to be persistent, which would make e.g. service worker updates difficult - ideally the browser should show you that an update is available, and offer to delete all stored information so nothing can be saved to localStorage etc. to be uploaded afterwards.

[0]: https://www.npmjs.com/package/vite-plugin-singlefile