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The present study evaluated the impact of IXL, a widely used web-based supplemental learning tool for K-12 schools. Using a quasi-experimental design with data from 1,507 public schools across the state of Kentucky, researchers found significant impacts of IXL usage on school performance as measured by the 2019 Kentucky state assessments. Kentucky schools that used IXL outperformed schools that did not use IXL in both math and reading. The longer the schools used IXL, the better they performed. Results also showed that more IXL usage was associated with higher achievement. Schools that adopted IXL performed better when their students spent more time, answered more questions, reached proficiency in and mastered more skills on IXL.