Credits and open data
Last updated: 2026-11-08 · Version 2026-11-08
The words and passages you type come from openly licensed or public-domain sources. This page gives the credits those licenses ask for.
Word lists
Word frequency data derived from the Google Books Ngram Corpus (English 1-grams, version 20120701), licensed under CC BY 3.0 (creativecommons.org/licenses/by/3.0). Jean-Baptiste Michel, Yuan Kui Shen, Aviva Presser Aiden, Adrian Veres, Matthew K. Gray, William Brockman, The Google Books Team, Joseph P. Pickett, Dale Hoiberg, Dan Clancy, Peter Norvig, Jon Orwant, Steven Pinker, Martin A. Nowak and Erez Lieberman Aiden. Quantitative Analysis of Culture Using Millions of Digitized Books. Science (published online 16 December 2010).
Word filtering uses SCOWL (Spell Checker Oriented Word Lists), copyright 2000-2018 by Kevin Atkinson, and the sources it credits (including Moby Words, 12Dicts, ENABLE, WordNet 1.6 (c) 1997 Princeton University, UKACD (c) J Ross Beresford 1993-1999, VarCon, and Ispell (c) 1993 Geoff Kuenning). Permission to use, copy, modify, distribute and sell these word lists for any purpose is granted provided the copyright notice and permission notice appear in supporting documentation. Full text: the Copyright file in scowl-2020.12.07.tar.gz (wordlist.aspell.net).
Quotations
Quotations are from public-domain works made available by Project Gutenberg (gutenberg.org), by authors including Austen, Doyle, Carroll, Twain, Dickens, Stoker, Shelley, Stevenson, Wilde, Wells, Kipling, Melville, Thoreau, Emerson, Franklin, Aesop, Grimm, Andersen, the Brontë sisters and Darwin. Project Gutenberg is a registered trademark of the Project Gutenberg Literary Archive Foundation; this service is not affiliated with it.
Software
The licenses of the open-source software this service is built with are listed in THIRD_PARTY_NOTICES.