The 21st-century learning demands for teachers to become a central agent in fostering various skills to students. Concurrently, teachers were also encouraged to utilize ICT in scaling up learning quality. In support of this initiative, this study introduced a crowdsourcing platform called Krumun.org developed specifically for Malaysian teachers. This exam-building crowdsourcing platform enables teachers to create, edit, and share assessment instruments. However, whether teachers will use the platform will depend on their acceptance of this new technology. Therefore, the main objective of the study is to determine teachers' acceptance factors in regards to the use of this crowdsourcing platform through the Unified Theory of Acceptance Use Technology (UTAUT) model. Questionnaires were distributed to 155 teachers who participated in Krumun.org trial launch. Partial least squares (PLS) was employed to analyze the research model through Smart-PLS 3. It is conclusive that performance expectancy (PE), self-efficacy (SE), and facilitating conditions (FC) affect behavioral intention to accept the crowdsourcing platform, Krumun.org. However, there was not enough evidence to support Effort Expectancy. Therefore, to increase the number of teachers utilizing this platform, these three factors should be prioritized. The findings of the study could also be of assistance to any related party that was planning to introduce new technology to teachers.