The goal of this study was to further evaluate the impact of IXL on learning outcomes in math and ELA. Using a quasi-experimental design with matched treatment and control groups, we analyzed data from 296 public schools in Colorado during the 2018-2019 school year. The analysis of IXL Math included 186 schools (93 treatment, 93 control), and the analysis of IXL ELA included 110 schools (55 treatment, 55 control). IXL adoption in treatment schools ranged from 10% of students in the school to 100% of students. Even with these variable adoption rates, we found positive and statistically significant effects of IXL usage, as measured by the Colorado Measures of Academic Success (CMAS) assessments.