The best replacement for sign up is sign-up.

The best alternatives to sign up are rated as following:
★★★★★  sign-up
★★★  sign in
★★★  register
★  log in
★  sign up
★  login facebook
★  login
★  registration
  pink nation
  subscribe

Your alternative for sign up is not listed? Suggest!
Speaking about sign up, one probably shouldn't forget about downloading.

Other search terms related to sign up and their ratings are:
★★★★★ downloading
You have in mind a companion for sign up and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sign up in all years. Click on graph for more.
sign up
sign-up
sign in