Molecules is an application for viewing three-dimensional renderings of molecules and manipulating them using your fingers. You can rotate the molecules by moving your finger across the display, zoom in or out by using two-finger pinch gestures, or pan the molecule by moving two fingers across the screen at once. These structures can be viewed in both ball-and-stick and spacefilling visualization modes.

New molecules can be downloaded from either the RCSB Protein Data Bank (, an international repository of biological molecules and their 3-D structures, or NCBI‘s PubChem (, a public database of compounds. Molecules can be downloaded directly to your handheld device and stored there for later viewing.

Custom molecular structures can be downloaded to the application via iTunes file sharing, or through the use of custom URL formats.

Molecules is a BSD-licensed open source project.

For free this is a great app for high school and college students taking Chemistry. You can rotate the molecules around to view the molecule from all sides too.  I’m afraid my knowledge of Chemistry makes it hard for me to review it properly, but it is a colorful app that makes it easy to visualize molecules from all vantage points.

Reviews online are also great:

Good app

by anjing

This is a very nice, simple app. Yes, a color key would be nice. It could also use a noticeable designation for single, double and triple bonds. I would also like to have my list of molecules alphabetized.

This will make a nice reference for use with my students and I will recommend it to them.

by Ron Charlton

Molecules does what it says it will. A color key will make it rate five stars for me. THE PRICE IS NICE!

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