The best replacement for signing up is paying.

The best alternatives to signing up are rated as following:
★★★★★  paying
★★★★★  downloading

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

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



Google Trends

Scale is based on the average worldwide traffic of signing up in all years. Click on graph for more.
signing up
paying
downloading