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Yeah, just checked it out, and i really like. Where did you get the multiple users, to e it says "coming soon" when i click...

I did not use simplEOS to create a separate​ account, I used https://toolkit.genereos.io/tools, but as I had more than 1 account, simplEOS displays the details for all for them by default which is a really nice touch.

Does it cost (in EOS tokens) to create a new account?

Yes and no. You will need to send some tokens (or a fractional amount) to the newly created account but they can be withdrawn at any time.

Ah yeah, had a look at that too, but then thought, paste the private keys into a website, decided that rather not to.
There is a EOS account creator, which only takes your public key, but they charge 8$ for it, so maybe will wait for SimplEOS to immplement

Do not use that, paying for an account is daylight robbery.

Scatter works with the genereos site, I would never enter my private​ keys into a web page.