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
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