The present article describes VAS Generator (www.vasgenerator.net), a free Web service for creating a wide range of visual analogue scales that can be used as measurement devices in Web surveys and Web experimenta-
tion, as well as for local computerized assessment. A step-by-step example for creating and implementing a vi-
sual analogue scale with visual feedback is given. VAS Generator and the scales it generates work independently
participants are reported and show that the scales generated with VAS Generator approximate an interval-scale
level. In light of previous research on visual analogue versus categorical (e.g., radio button) scales in Internet-
based research, we conclude that categorical scales only reach ordinal-scale level, and thus visual analogue
scales are to be preferred whenever possible.