Endnote X9 Compatibility:
Operating Systems: Windows 7 SP1 or later | macOS 10.10 or later
Cite While You Write™ compatibility: Microsoft Word 2007, 2010*, 2011, 2013*, 2016*
Bibliographic formatting integration: Wolfram Mathematica 8, Apple® Pages
*32 and 64 bit Macintosh and Windows product keys are cross-platform compatible.
Endnote 20 Compatibility:
Operating Systems: Windows 10 or later | macOS 10.10 or later
Cite While You Write™ compatibility: Microsoft Word for Windows: 2010, 2013, 2016, 2019, Office 365 (locally installed desktop version only); Microsoft Word for macOS: 2016, 2019, Office 365 (locally installed desktop version only)
Bibliographic formatting integration: Wolfram Mathematica 8, Apple® Pages