"Let's Count Online" is a new e-learning approach to delivering "Let's Count" professional learning. It was evaluated in 2018. The findings suggest that the e-learning platform was successful, and that the outcomes for educators were similar to those achieved by participants using the face-to-face workshop professional learning model. Several key differences in outcomes were noted, and these inform recommendations for refining "Let's Count Online." [This paper is the first in a symposium of three papers. For the second paper, "'Let's Count' in Early Childhood Teacher Education," see ED616194. For the third paper, "'Let's Count' and Community Professionals," see ED616191.]