Who are the key players in the viewability measurement landscape? Undertone put together this infographic to help you see who's who in viewability measurement in the digital ad space. Updated May 30, 2013.

1. VIEWABILITY
MEASUREMENT
MEASUREMENT PROVIDERS
MEASUREMENT MEDIA
AND MOAT
NIELSEN
VIZU
C3 METRICS ONSCROLL
COMSCORE
DOUBLEVERIFY
FORMERLY ADSAFE
INTEGRAL
ADSCIENCE
SPIDER.IO
REALVU GOOGLE
MEDIAMIND POINTROLL
POWERING
MEASUREMENT CREATIVE
AND
MAY 2013
TELEMETRYALENTY
MEETRICS
OWNED BY NIELSEN
ACCREDITEDby Media Rating Council