Third-party Licenses

Last updated: February 8, 2026

Frontend Tooling

• esbuild (MIT)
• http-server (MIT)
• terser (BSD-2-Clause)

Word Frequency Data

ChangeWord's generation pipeline uses data and software from wordfreq.

• Project: rspeer/wordfreq
• PyPI: wordfreq on PyPI
• Citation: Robyn Speer (2022), rspeer/wordfreq: v3.0 (v3.0.2), Zenodo, DOI 10.5281/zenodo.7199437
• Package code license: Apache-2.0
• Included data files may be redistributed under CC BY-SA 4.0

Required Attribution Notices (wordfreq upstream)

• This product includes data extracted from Google Books Ngrams. Source: Google Books Ngram Viewer.
• This product includes data derived from Creative Commons sources used by wordfreq (including Wikipedia, Leeds Internet Corpus, and ParaCrawl), as documented in the wordfreq project.
• This product includes data derived from SUBTLEX word lists by Marc Brysbaert et al.; SUBTLEX remains freely available data.

Derived Word Lists

ChangeWord may distribute generated word lists derived from wordfreq inputs. Attribution and applicable share-alike obligations for underlying data sources are preserved through this notice page and linked upstream documentation.

Notes

This page is a compliance summary for third-party software and data used by ChangeWord. For full license texts or source-attribution details, contact squareword.org@gmail.com.