A Doodle account is not a requirement to use Doodle. A Doodle account offers a number of advantages for regular Doodle users: It saves your participation and admin links in your personal dashboard. Wherever possible, Doodle pre-fills your name and e-mail address. Using your personal Doodle ICS Feed, you can subscribe to your scheduling information in Doodle from your calendar. Last, but not least, Doodle account users can invite or contact participants directly from Doodle.
To create your own free Doodle account, follow this link.