RxNify

What it does

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.

Precursor tree from the active dictionaries. Expand nodes to see the next step; click "Load" to draw a precursor. Draw a starting molecule in Ketcher and click "Map" to see all possible 1-step transformations. Your saved predictions. Load one back into Ketcher or re-run it. Draw a peptide or nucleotide in Ketcher's polymer editor, or type a 1-letter sequence below. Select a probing mode to analyze the molecule's reactivefrom rxnify.vercel.app

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