CommonLit has proven to be an effective, engaging, research-based reading program.
Based on analysis of over one million students using CommonLit during 2017 and 2018, a third-party evaluator authored a report on CommonLit's effectiveness. The report found that:
Students who complete more CommonLit assignments experience greater gains in reading performance
Increased CommonLit usage is associated with more students at proficient or mastery level on a state assessment
Students at Title I (low-income) schools experience greater gains on CommonLit
study of the CommonLit 360 Curriculum
in seven middle schools in New York City showed statistically significant gains in reading achievement, across all grades. Fidelity to the program was a predictor of better outcomes.
Students who were exposed to CommonLit in our 2014 quasi-experiment showed greater gains in student engagement than a comparison group. Read our full report from 2014.
CommonLit is entirely research based. Our whole program is designed to nudge teachers to use best practices in adolescent literacy instruction. Learn more about the practices CommonLit promotes here.
CommonLit released an open-source corpus of 4,700 reading passages tagged with difficulty. The 2021 CLEAR Corpus was used to develop a new readability algorithm and is
to researchers free of charge.