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iChem, written in Cocoa for Mac OS X exclusively, is a full-featured periodic table and molecular weight calculator. It offers a multitude of features you won't find in many other places. The molecular weight calculator alone is invaluable to chemistry professors, students, and practitioners the world across.

What's New

Version 1.3 adds the following:
  • Moved registration scheme to the FSS style
  • Updated some information on a few elements
  • Fixed a small leak in the molecular weight calculator


Mac OS X 10.1 or later

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iChem User Discussion


Current Version (1.x)


Downloads 6,190
Version Downloads 3,485
License Shareware
Date 11 Dec 2003
Platform OS X / PPC 32
Price $5.00
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