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Show HN: Every Site Knows (ferrucc.io)
17 points by 0xferruccio 8 days ago | hide | past | web | favorite | 9 comments

I recommend adding a slide on how you are doing this for educating those of us who do not know. From a high level, I assume the logins are detected via cookies.

Edit: interesting! Its by checking if favicon images would be loaded.

Edit 2: Found this old thread by hoppinh through webkay https://news.ycombinator.com/item?id=11415462

Turns out I dont have any social accounts. Interestingly, http://webkay.robinlinus.com/ detects that Im logged into Flickr although I dont even have an account there.

Very nice, it got everything right in Chrome. But a little confused in Brave (said I had Reddit account). But very cool app.

Thanks for letting me know about the reddit bug! will download Brave to see if I can fix it

Nice, it detected spotify and dropbox for me. Didn't recognize twitter or gmail.

Yeah unfortunately I can’t detect twitter anymore.. I have to come up with something new to detect logged in users for it

location on mobile was scarily good. how does that one work?

Neat! Good work!

Thanks :)

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