Yes, you can preview a study as a participant would see it before launching.
Simply navigate to the final page of the study creation window and click 'preview' in the bottom right corner.
Your study should appear in the iFrame and when you reach the completion URL you should see a message that tells you that you've set up your completion URL correctly - you may be asked to sign in again in order to test this step.
Please note that due to recent changes in our participant interface, participants are no longer able to view studies in the iFrame. We have disabled the iFrame option by default for all studies, so participants will now have to open studies in a new window to proceed.
Our preview functionality will soon be updated to reflect the removal of iFrame.