MoleculeSketch is a simple and easy to use drawing App for chemical formulas and reactions.

It has following features:
+ add atoms and bonds nicely by position locking (can be disabled)
+ choose different double bond styles
+ add stereo bonds
+ add bonds with higher hapticity
+ type functional groups by double-clicking on symbol
+ show missing hydrogen atoms depending on free valences
+ "grow" and remove hydrogen atoms
+ show non bonding electron pairs on heteroatoms
+ change background color of drawing area and add a grid
+ copy/paste/cut molecules and drawings
+ paste drawings into other applications as pdf drawing
+ import from mol files (V2000 format)
+ use trackpad gestures for zooming and rotation
+ access drawing attributes from popover panels
+ add reaction arrows and text fields
+ calculate average mass and formula of molecules
+ group and arrange objects

What’s New

Version 2.1.4

- changing the default bond length in preferences now works again and prevents problems when adding ring systems (thank you for reporting this problem!)
- better support of dark mode

Ratings and Reviews

3.6 out of 5
5 Ratings

5 Ratings

Nosimaj5 ,

Just what I needed and so cheap

I teach o-chem at a state college. The budget does not include drawing software. This little programs has everything I need and it seems like the devoloper is very responsive to feedback. I couldn't be happier. Its not a smooth as something like chemdraw, but it has all the basics and its not even a montly fee. Thank you!

CHM13 ,

Pretty good for the price

It more or less does what you need it to do, however, I could not see any way of using fixed bond lengths and angles. So, all the drawings look a little sloppy since all the bonds lengths and angles are just eyeballed. Still, for $3, not too shabby.

shahidullah ,

Reaction arrow

When I tried it has become pain and could not add any arrow for reaction FROM MY YOSEMITE


Stefan Dolder
16 MB

macOS 10.12 or later, 64-bit processor


English, French, German

Age Rating
Rated 4+
© 2014 Stefan Dolder


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer