ReadTheory is a K-12 online reading comprehension program that presents assessments to students at a "just right" level. Using algorithmic science coupled with grade and Lexile® level information, we ensure our assessments are always challenging but never discouraging. After just 20 minutes on ReadTheory, students generate enough data to populate their very own progress reports replete with insights about their unique reading abilities.


Over 5 million students have completed more than 95 million quizzes on ReadTheory to date.

Available Anywhere, Anytime
Available for desktop and mobile, you can use ReadTheory whenever and wherever you want.
Trusted by Teachers
"ReadTheory is a great program. It enables me to provide differentiated reading to my students who have struggled to pass our state exam and are largely English Language Learners."
"ReadTheory is a valuable tool for helping kids grow as readers. I am requiring it for all of my students this year."
"I use ReadTheory for IEP progress monitoring—thanks to the awesome data it provides—and recommend to parents for students to use at home. A powerful, powerful tool."
"I love the way students can track their progress and I can easily see many different reports as they go. I look forward to using it for years to come."
  • Gabriel Cerda
    ELA teacher at PSJA North Early College High School
  • Agnes Arnborg
    ELA teacher at Littleton Elementary School
  • Rochelle Spicer
    Special services teacher at Olathe South High School
  • Nikkos Almofa
    ELA teacher at Plainview Middle School
Review our preliminary study results to learn how ReadTheory improves test scores, grades, and confidence.