This paper presents social validity findings from a mixed-methods study of educators who used a recently adapted online version of the research-based Double Check culturally-response practices and student engagement program. Results from 41 participants indicated that the program was easy to use, prompted them to reflect on their own culture, and that they would continue using the website. Although most users reported they would recommend the program, participants indicated they would like a wider variety of examples and more guidance for novice teachers. Additional conclusions and recommendations for improving Double Check and other online teacher professional development programs are discussed. [This paper was published in "Teaching and Teacher Education" v142 Article 104522 2024.]