Technologycal changes have a major impact on education which requires educators to be creative and selective in determining learning media. This research and development develop Wekiddo-based m-learning content to improve students' learning outcomes and critical thinking, determine product feasibility through media and material validation. M-learning makes it easier for educators to provide distance learning. The developed media product includes planning, implementation, and assessment. Through the development of the Borg and Gall model, Wekiddo-based m-learning content was declared feasible and valid by media experts, and m-learning users. Wekiddo-based m-learning content is proven to be effective in improving students' learning outcomes and critical thinking in the 21 st -century learning era. This study found differences in critical thinking abilities and student learning outcomes before and after using Wekiddo. Improvement and feasibility of this learning media can be used for learning in other subjects.