Isoplot 3.7 and Isoplot 4.1 are “Add-In” programs that run only under Windows Excel versions 2003 and earlier (Isoplot 3.7), or only under Excel versions 20 (Isoplot 4.1). Isoplot is a flexible tool for the mathematical and graphical interpretation of radiogenic-isotope data, especially as applied to geochronology. BGC is not affiliated with Red X® Holdings, LLC. Isoplot® is a registered trademark of Red X® Holdings, and is licensed to Shainin ® LLC. Isoplot is BGC’s Visual Basic Add-in for Microsoft’s Excel ® for data analysis and graphical presentation of geochronology, earth science and other radiogenic isotope data only.īGC’s Isoplot is not the Isoplot® for analysis of any measuring system as described at.