The Readability Features Sandbox

Play in our
Readability Features Sandbox


Software developers often create a test environment, called a sandbox, with elements for the intended users to try before the code is built, tested and deployed.

Play in the Sandbox to explore the impact of having access to the features that allow you to change your base font, your character spacing or character width, and more.

Improve your own reading experiences. Ask your digital content providers to add Readability Features.

In addition to the original Readability Matters Sandbox which demonstrates Readability Features using Alice in Wonderland,  Readability Matters is pleased to feature a fun article from WorldEd’s The Change Agent, a magazine published for adult education.



“You wrecked it for me. Ever since I tried personalized formats, I don’t want to go back [to a publisher selected format].”
– Nanci
Readability Features Sandbox
Visit the Readability Matters Sandbox
The Change Agent Readability Sandbox
Example of Base Font change
Example of text size change
Example of character spacing change
Example of character width change
Example of character weight change
Example of line spacing change

Readability Matters on GitHubReadability Matters makes the code for our open source* Readability Sandbox available on GitHub.

* Open Source projects, products, or initiatives embrace and celebrate principles of open exchange, collaborative participation, rapid prototyping, transparency, meritocracy, and community-oriented development. Open source software is software with source code that anyone can inspect, modify, and enhance.

Alice in Wonderland is licensed under a

Creative Commons Attribution 4.0 International license.

Learn more about Readability Matters