Free tools
Chemistry tools thatrun in your browser.
No login, no upload — every calculation happens locally on your device. Built on the same engines that power Cheemly.
Molecular weight calculator
Paste a SMILES string to get average molecular weight, monoisotopic mass, formula, and atom count — instantly, in your browser.
SMILES validator
Check whether a SMILES string is valid, get the canonical form and molecular formula, and see the structure — locally, no login.
SMILES to structure viewer
Paste a SMILES string to render the 2D structure and download it as a clean SVG — instantly, in your browser.