Just a Letter is built on open-source work. Every font in the app and on this site is a Google Fonts release under the SIL Open Font License 1.1 or the Apache License 2.0. All are free for commercial use, all are embedded unmodified, and none requires a paid licence.
| Font | Licence | Copyright | Designer |
|---|---|---|---|
| Dancing Script Reserved Font Name "Dancing Script" | OFL 1.1 | Copyright 2016 The Dancing Script Project Authors | Pablo Impallari |
| Caveat | OFL 1.1 | Copyright 2014 The Caveat Project Authors | Pablo Impallari |
| Parisienne Reserved Font Name "Parisienne" | OFL 1.1 | Copyright (c) 2012 by Brian J. Bonislawsky DBA Astigmatic (AOETI) | Astigmatic |
| Indie Flower | OFL 1.1 | Copyright 2010 The Indie Flower Authors | Kimberly Geswein |
| Alex Brush | OFL 1.1 | Copyright 2011 The Alex Brush Project Authors | Robert E. Leuschke (TypeSETit) |
| Homemade Apple | Apache 2.0 | Copyright (c) 2010 by Font Diner, Inc. All rights reserved. | Font Diner |
| Gloria Hallelujah | OFL 1.1 | Copyright (c) 2010, Kimberly Geswein | Kimberly Geswein |
| Font | Licence | Copyright | Designer |
|---|---|---|---|
| Lora Reserved Font Name "Lora" | OFL 1.1 | Copyright 2011 The Lora Project Authors | Cyreal |
| DM Sans | OFL 1.1 | Copyright 2014 The DM Sans Project Authors | Colophon Foundry, Jonny Pinhorn |
| DM Mono | OFL 1.1 | Copyright 2020 The DM Mono Project Authors | Colophon Foundry |
Eight of the drawing brushes in the app stamp brush tips from the “Deevad 25.01” Krita bundle by David Revoy, released into the public domain under CC0: “You are free to do commercial work with them, to reshare them, to fork them, to reuse them, to include them in your software.” Only the tip images are used; the brushes themselves are built on this app’s own drawing engine. CC0 asks for no credit; he gets it anyway.
The country-flag icons in the site's language switcher are by Magnific, used under Flaticon's free licence:
The app is built with Flutter and a number of open-source Dart packages; the website with Next.js and React. The complete, itemised list of package licences is available in the app under Settings → About → Open-source licences.
SIL Open Font License 1.1 · Apache License 2.0
Thank you to every designer and maintainer who makes their work free to build on.