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Message to our Loyal Users of CAST UDL Lesson Builder, UDL Book Builder, UDL Exchange, and UDL Studio

On January 15, 2024, we will retire this website, along with a few others. We know it has many devoted followers who will be sad to see it go. We're sad, too.

Making these creative tools and offering them free-of-charge to educators, parents, and learners at no charge the past decade-plus has been our joy, we also know that usage is way down, funding for the tools ran out years ago, and their underlying technologies are no longer contemporary.

To ensure a smooth transition, we're providing a three-month sunset period so you have sufficient time to download any stored materials you may have on the sites and to find alternative tools. After January 15, we will also close all user accounts.

Thank you again for your understanding and be sure to visit to learn more about the exciting innovations we are pursuing today and tomorrow! Questions:


The CAST Universal Design for Learning (UDL) Lesson Builder provides educators with models and tools to create and adapt lessons that increase access and participation in the general education curriculum for all students.

Select an entry point to get started:

1. Learn About Universal Design for Learning (UDL)
2. Explore Model UDL Lesson Plans
3. Create My Own UDL Lesson Plans

Photographs of students in various learning environments.

This web site was developed by CAST, Inc. through a subcontract agreement with the American Institutes for Research's K-8 Access Center: Improving Outcomes for All Students. Funding was provided by the U.S. Department of Education's Office of Special Education Programs (OSEP) under cooperative agreement #H326K02003.

CAST The Access Center: Improving Outcomes for All Students K-8

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