Sign Up, Log in, Join, Register or Create Account

How fast can you spot the difference between Sign up and Sign In? Sign in and Sign up are are quite close together. Using these button labels together causes users to click the wrong button.

Site New users Existing users
Last.fm Join Login
Flicker Sign Up Sign In
Instagram Register Log in
Twiitter Sign Up Log in
LinkedIn Join now Sign in
Mailchimp Sign Up Free Log in
Vimeo Join Log in
YouTube Upload Sign in
Amazon Start here Sign in
Microsoft Live Create one! Sign in
Netflix Join Free for a Month Sign in
Apple Don’t have an Apple ID? Create one now. Sign in
GitHub Sign up Sign in
Intercom Get Started Log in
Wordpress Sign Up Log In
Medium Sign up Sign in
eBay Register Sign in
Spotify Sign up Log In

Overall winner is Sign In - almost 60% pages are using this sentence. For new users is better using something else then Sign up (read Stop Asking Me to “Sign Up”)