PubChem App

PubChem App is an independent, unofficial client for PubChem, the open chemistry database of the U.S. National Library of Medicine. It is not affiliated with, endorsed by or sponsored by the NIH, NLM or NCBI. Look up any of the 100+ million compounds in PubChem and get a clean, fast, phone-first view of the chemistry — plus a set of lab tools that keep working when your signal does not. SEARCH ANY MOLECULE • Search by common name, molecular formula, PubChem CID or SMILES string • Live suggestions as you type • Structure depictions, molecular weight, XLogP, TPSA, H-bond donors and acceptors, rotatable bonds, complexity and more • Copy SMILES, InChI and InChIKey with one tap • Jump straight into safety, pharmacology, patents, spectra and literature A LAB BENCH IN YOUR POCKET — WORKS OFFLINE • Molar mass calculator that understands nested groups and hydrates, from H2O to Fe2(SO4)3 and CuSO4·5H2O, with a per-element breakdown • Dilution calculator (C1V1 = C2V2) — fill any three values, get the fourth • Weigh-out calculator: target concentration and volume to grams • The full periodic table, all 118 elements, searchable and offline LEARN A MOLECULE A DAY • A new compound of the day, every morning • A five-question daily challenge: name the molecule from its structure • Streaks, XP, levels and 13 badges to collect • One optional daily reminder — no spam, ever BUILT FOR STUDENTS AND SCIENTISTS • Save compounds to a library you can read offline • History of everything you have looked up • Light and dark themes • Records cached on device so repeat lookups are instant Chemical data is retrieved live from PubChem (NCBI / NLM). Information in the app is provided for educational and research use only. It is not medical, pharmaceutical or safety advice — never handle a chemical based on this app alone. Always consult the official safety data sheet and a qualified professional.