One of the characters of the globalization era is the rapid changes in various aspects of life. One of them in the advancement of science and technology, especially Information and Communication Technology (ICT) has much positive influence on the progress of education. The advantage offered not only lies in the speed factor and the ease of getting information or material resources, but some multimedia facilities can make the learning process more exciting and interactive. However, the use of this technology in learning still needs to be improved and socialized among educators. Regarding the learning problem, this study aims to see the effect of blended learning assisted by Google Classroom and Schoology applications. The objective of this research is to impleme n t more effective blended learning model using specific Learning Management System (LMS) to increase student learning achievement following the needs of the present era. The research design of this study was the posttest-only control group design. Two groups were given different learning. One group was as a class taught using Schoology. The other group was as a class taught using Google Classroom. The independent variable of this study is the learning strategy. The dependent variable is critical thinking skills. The instrument for measuring the critical thinking skills was problem-based question that validated the difficulty level and power of determination. The study population was students of a high school in Indonesia. The sampling technique used simple cluster random sampling. The sample in this study consisted of two classes. Testing the hypothesis of the effect of blended learning was on the results of critical thinking skills using ANOVA. From the results of this study, it can be concluded that in the case of blended learning, students who were taught to use Schoology as LMS obtained a score of critical thinking skills that were relatively higher compared to students who used Google Classroom.