Credits and licences
Letrazo builds on other people’s open work. Thank you to all of them.
Valid words in Spanish
The list of words Letrazo accepts in Spanish contains only words accepted by the RLA-ES spelling dictionary for Spanish as used in Spain (es_ES, dict-es 2.8 for LibreOffice), created by Santiago Bosio and the RLA-ES contributors (github.com/sbosio/rla-es).
RLA-ES is tri-licensed (GPL 3+, LGPL 3+ and MPL 1.1+). Letrazo uses the list under the Mozilla Public License 1.1. We publish the list here exactly as it ships in the app, with its notice: guesses-es.txt (111,709 words), licence notice and changes and the MPL 1.1 text. The rest of the app is not covered by the MPL.
Valid words in Catalan
The Catalan word forms come from the Leipzig Corpora Collection (Universität Leipzig, wortschatz.uni-leipzig.de): “Catalan Wikipedia corpus based on material from 2021” and “Catalan news corpus based on material from 2016”, licensed CC BY 4.0.
We used the Softcatalà spell checker (dictionary-ca 3.0.0, GPL-2.0 or LGPL-2.1) to filter those forms when building the list. No part of the spell checker is included in the app.
Clues and themes
The Cuadro clues and the Sopa themes are written for Letrazo. Every clue is checked against the dictionary and passes an automated review before it goes into a puzzle.