The quality of youth education, in general, is worsening (Coppola and O’Higgins, 2015). Some of the reasons for such a statement are (i) the current changes of educational systems in general, (ii) eventually unreasonable switching between ephemeral learning trends and tools. Despite the use of learning management systems, learners or educators, face today a real and increasing difficulty in finding optimal communication for the learning coalition between the students and the teachers. In this research, students’ activity in two popular learning management systems (LMS): MOODLE and Open edX are analyzed. We examine both platforms by measuring and comparing the students’ activity from the learning-time aspect. The novel – CAST algorithm is proposed to reduce the overestimated learners’ activity measuring errors, caused by unterminated WEB sessions. We conclude that Open edX engage students more, therefore, educational institutions should move forward to modern eLearning platforms.