I think “identities” used on Gemini (at least the way they are implemented in Lagrange browser) are the best implementation of a similar idea, but, you know, it’s only supported in Gemini.

So pretty much same as ssh/gpg private/public keys? Do many websites support this? I don’t remember seeing any that would give me an option to register using passkeys. Also, where are the private keys stored? How do I move them from device to device (for example, I signed up on android and now want to log in on desktop)? Do I back them up and restore when I’m buying a new phone?

Sorry for being silly here, I’ve been kind of out of the loop with recent technology, what exactly is “passkeys”? I remember reading something when it was announcement, but all I saw was lots of buzzwords and vague “it’s new and it’s very good” claims.

Is it like, an alternative authorization method? Is it a second factor after I type my login/password, or does it replace passwords? What does it look like, from users perspective?

the idea of being a true second brain

It’s good that it’s built with this idea, but what is the actual implementation of this idea? What features make it «a true second brain» that other «second brain» apps (obsidian and hundred other note taking apps) don’t have?

I never encountered jxl in the wild so I don’t know which apps support it, but if somehow you found a jxl file and don’t know how to view it, this one works:

https://apt.izzysoft.de/fdroid/index/apk/fr.oupson.jxlviewer

I really liked T9 keyboard, until I tried to type stuff like URLs, emails, passwords etc.