Koios is absolutely free. No strings attached.
How does the login work
Koios provides a super easy way for you to login using your existing Twitter, Facebook, LinkedIn or Google account. By using these login providers you get an extremely simple way to register a user account and we get a simple mechanism to authenticate users to prevent spammers.
At the moment we don't copy any of your private data from Twitter, Facebook, LinkedIn or Google. The only exceptions are your profile image, name/user-name and e-mail. Your e-mail is not made visible to others unless you actively change your profile to display it.
Don't have or don't want to use your Twitter, Facebook, LinkedIn or Google account?
Sorry you will not be able to contribute on Koios. Maybe we'll have time to develop a sign up form some time in the future. We want to focus on developing the best problem solving service and not bother with all the work associated with user sign up, profile management, password reset, login etc.
But hey, Signing up on Twitter is easy.
We use the OAuth protocol to authenticate you as a user.