This study investigates the effectiveness of ReadTheory.org, a free online reading comprehension platform, in enhancing the reading skills of English - major students as English as a Foreign Language (EFL) learners at University of Finance - Marketing. Seventy-four English majors participated in a semester-long intervention where they completed ReadTheory exercises alongside their regular reading curriculum. Pre- and post-tests were administered to measure reading comprehension improvement. Additionally, a survey assessed students’ perceptions of ReadTheory. The study found that ReadTheory use led to statistically significant improvement in reading comprehension scores. Students also reported positive experiences with the platform, indicating its potential as a valuable tool for EFL reading instruction.