Building sites where email addresses are usernames is often handy, but it makes it so easy to type your email password into the wrong site.
miniblog.
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Discord has a neat login technique I haven't seen before.
If you open the native client, it checks to see if you've already logged in from the browser! If you have, you don't need to re-enter your password.
Magic login links are underrated. They're a great way of logging in to little-used services, and faster than the password reset process.
Using spaced repetition apps with 1Password to help you memorise passwords without storing them in plaintext: https://boinkor.net/2018/11/memorizing-passwords-with-anki-1password/
Cute idea, although ideally a password manager minimises the memorisation necessary. It's a nice example of composing apps though.