AlternativeTo is a website which lists alternatives to web-based software, desktop computer software, and mobile apps, and sorts the alternatives by various criteria, including the number of registered users who have "Liked" each of them on AlternativeTo.

[3] Users can search the site to find better alternatives to an application they are using or previously have used, including free alternatives such as free web applications (cloud computing) which don't require any installation and can be accessed from any browser.

Users can also narrow their search by focusing on particular platforms and license types (such as "free for non-commercial use").

AlternativeTo allows anyone to register and suggest new alternatives, or to update the information held about existing entries.

After a user has clicked the Like button next to an application, they are offered the opportunity to tell their friends on Facebook or their followers on Twitter that they liked it.