OCRXN is a free, web-based organic chemistry reaction predictor and simulator. Built for students, educators, and researchers, it allows users to input reactants, test reagents, and predict major reaction outcomes in real time. Powered by a flexible rule-based engine, OCRXN lets users toggle pre-built reaction sets or upload custom JSON dictionaries to test custom mechanisms—all without paywalls, sign-ups, or software downloads.
