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From NASPAWiki

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NASPA Zyzzyva is a word study and word adjudication program.

Supported Operating Systems

NASPA Zyzzyva is an application for desktop and laptop computers, currently available for the Windows, macOS, and Linux operating systems.

The new NASPA Zyzzyva Mobile app is now available for iOS and Android devices. Please see that page for information about the mobile version.

Current Version

Version 3.3.0 introduces the CSW21 lexicon. It continues to include the NWL2020, NSWL2020, NWL2018, NSWL2018, CSW19, and Volost lexicons.


Michael Thelen wrote the original version of what was then Zyzzyva, and maintained it for many years as it gained worldwide popularity. Zyzzyva has been used at software self-lookup stations at most North American SCRABBLE tournaments, including BAT, Oregon TILE, the Dallas Open, the National SCRABBLE Championship, National School SCRABBLE Championship, the Canadian National SCRABBLE Championship and the World SCRABBLE Championship.

In September 2014, NASPA bought all rights to Zyzzyva, and we have worked since then with our SCRABBLE partners to ensure access to all the official word lists for our members.

NASPA’s Zyzzyva Committee has continued development of the desktop edition of what became NASPA Zyzzyva. Their most recent work has been to factor off a common code base for all NASPA Zyzzyva platforms, desktop and mobile, so that they can be maintained in parallel. The Committee welcomes suggestions about improvements to the software.

Version History

NASPA Zyzzyva 3.3.0
the official source for NWL2020, NSWL2020, NWL2018, NSWL2018, CSW21 and CSW19
NASPA Zyzzyva 3.2.4
the official source for NWL2020, NSWL2020, NWL2018, NSWL2018, CSW19 and CSW15
NASPA Zyzzyva 3.2.1
the official source for NWL2018, NSWL2018, CSW19 and CSW15
NASPA Zyzzyva 3.2.0
the official source for NWL2018, NSWL2018 and CSW15
NASPA Zyzzyva 3.1.0
the official source for OTCWL2016, SSWL2016 and CSW15 as well as older versions OTCWL2014 and SSWL2015
NASPA Zyzzyva 3.0.4
the official source for OTCWL2014 and SSWL2015
NASPA Zyzzyva 3.0.3
a time-limited test release that expired in May 2015
Zyzzyva 0.9.4
released 2006-01-14, first version to include OTCWL2

Frequently Asked Questions (FAQ)

The NASPA Zyzzyva FAQ, as with everything Zyzzyva-related, was originally written by Michael Thelen and then transferred to NASPA in 2014. It is now fully up to date with information about NASPA Zyzzyva.

Dedicated students should enjoy our new Cardboxing 101 and Cardboxing 201 articles, to get an idea of how you can power up your word study using NASPA Zyzzyva on desktops and NASPA Zyzzyva Mobile on mobile devices.

NASPA will be updating this page as time permits; we welcome specific questions or suggestions at zyzzyva@scrabbleplayers.org.