Students
Draw a mechanism while you are working through it, check the molecular weight and exact mass you just calculated by hand, and paste a clean structure into a problem set.
Molecular Drawing
That Keeps Up With You.
A structure for a report, a mechanism for a problem set, a quick check on a molecular weight. Sketch it, read its properties and get back to it anytime without exporting a file, switching applications and losing your place.
Free forever planFive tools30-second signup
See It In Action
Watch MolCaptiv8er at work
See how chemists sketch a structure, check its properties and export a figure - without leaving the page they were already on.
What the editor does
A Fast Structure Editor Where the Rest of Your Work Already Is
Not a replacement for a full chemical drawing suite - a quick, convenient editor for the structures you need while you are working, sitting next to the chat, ChemVoice and your files.
2D Sketching and 3D Views
Draw in 2D and turn any flat structure into a rotatable 3D model in a click - force-field-optimized conformations you can inspect from every angle, without leaving the browser.
Molecular Properties
Molecular weight, exact and average mass, isotopic mass distribution and molecular formula, calculated as you draw - so a quick sanity check does not mean opening a separate calculator.
Publication-Ready Export
Export as .cit, .png, .svg, .mol and .cif. SVG is vector, so a figure stays sharp at any size in a manuscript, poster or slide, and structures keep a consistent bond length and label size across a document - figures drawn weeks apart still match.
Templates and PubChem Lookup
Start from the template library - amino acids, aromatics, bicyclics, conformers, cycloalkanes, DNA bases, drugs, functional groups, steroids and sugars - or pull a structure straight from PubChem by name and edit it on the canvas.
Analytical Simulators on the Canvas
An HPLC chromatogram simulator and a TLC plate simulator sit on the same canvas as your structures, so a method figure and the compounds it describes live in one drawing. More spectroscopic simulators are in development.
Who Uses It, and For What
Where a Quick Structure Editor Earns Its Place
Most structure drawing is not a publication figure - it is a mechanism on the way to an answer, a slide before a meeting, or a worksheet due tomorrow.
Instructors
Build structures for worksheets, exam questions and lecture slides, and put a TLC plate or a chromatogram next to the compounds it separates.
Synthetic Chemists
Sketch a route step, adjust a substituent, and check the formula and mass of what you would actually be making before you run it.
Analytical Chemists
Draw the analyte you are developing a method for, then sketch the separation beside it with the HPLC and TLC simulators.
Reports and Presentations
Export vector SVG or PNG for a report, a poster or a slide deck - consistently sized, so a figure set drawn over weeks still looks like one figure set.
Alongside the Chat
Draw a structure while you are asking about it, or turn something from a conversation into a drawing without opening a second application.