Click here to purchase the Excel Add-In,
Or sign up for your free 30-day trial of our searchable database, by contacting us at:



Advances in mass spectrometers and computers have made it possible to compare, in seconds, accurate-mass fragmentation data directly against a large database of small molecules. This is the ideal solution for identifying many types of small molecules from MS/MS data: drugs, indigenous metabolites, food adulterants, packaging components, additives, and natural products.

The Rational Numbers™ searchable database of partitions resides on our server; all you need is your accurate-mass fragmentation data and any web browser.

Using pattern recognition, our simple Excel® Add-In rapidly transforms accurate-mass fragmentation data into a structure-orientated graphical format (Example). Built upon the graphical and computational capabilities of Excel, this Add-In also includes some handy mass spectral functions for Excel.

For a quick overview on how partitioning works, please view our 3 minute MathSpec YouTube Video.


MathSpec, Inc. • 1314 North Highland Avenue • Arlington Heights, IL 60004 • 847-840-4994 •

Rational Numbers is a trademark of MathSpec, Inc. Excel is a registered trademark of Microsoft, Inc.
Copyright © 2006-2015 MathSpec Inc. All rights reserved