Draw molecular structures with ease.

Structura is free to use for drawing molecular structures and exporting them to other applications. It is designed to make practical chemistry tools more accessible to students, educators, researchers, and independent scientists.

Download for macOS

Available for macOS · Windows · Linux · all downloads

caffeine.str — Structura

Structura structure editor showing caffeine drawn on the canvas, with live formula, molecular weight, SMILES and IUPAC name in the analysis panel

Made by chemists

Intuitive - with all the features you need.

Simple to use

Enable the snap tool

Bonds snap logically and curly arrows can be drawn by sweeping the mouse in a natural arc.

Structura's Draw bond tool dragging a bond freehand, before angle snap locks it to the grid

Structura's Add structure search box, ready to search PubChem by name, SMILES or CAS number

Search and save your favourites ♡

Search functionality you've come to expect

Search by name, formula, SMILES, or CAS number and IUPAC.

Always within reach

Favourite the fragments you reuse

Star a ring system, a protecting group, or a whole reagent — and it's one tap away in every document. Your personal library, right where you work.

Structura's Insert library Molecules tab showing starred favourites: Benzene, Boc Group and Glycine

Structura's Themes gallery with the house default Structura theme in use

Make it yours

A theme for every occasion

Find the style you need or create your own, whether that be for a publication, a presentation or live-teaching organic chemistry.

Free to use.

Structura has no subscription, licence key, account requirement, or telemetry. Keeping it free helps make molecular drawing tools available for teaching, research, and independent study. If you find it useful, you can support its continued development.

Download for macOS