OpenStax

OpenStax is a Rice University nonprofit publishing openly licensed, peer-reviewed textbooks for introductory courses. It fits students seeking no-cost core reading and instructors who want teaching materials they can adapt. The main reason to look elsewhere is when a course needs a different catalog or assignment workflow than OpenStax provides.

Overview

OpenStax traces its roots to Connexions, founded in 1999, and adopted the OpenStax name in 2012. Subject experts write its books, reviewers check them for accuracy, and the collection is updated regularly. Most titles open without an account, while a small number require sign-in. Students can read online on desktop or mobile devices, download free PDFs for offline use, or buy low-cost print editions.

In-book highlighting, notes, and study-guide creation support active reading. A free student account is needed for some of those tools. OpenStax says its digital materials strive toward WCAG 2.2 AA; the September 2025 Assignable accessibility report covers WCAG Levels A and AA but identifies some criteria as only partially supported. Support is available through a support center or email for textbook, educator-resource, and Assignable questions.

Key features

Textbooks and instructor resources

A free educator account provides test banks, PowerPoint slides, solutions manuals, and customization tools. This is a strong fit for instructors building an introductory course around an OpenStax title, because teaching preparation does not require buying a conventional textbook package. The value is narrower when the course depends on a specialized commercial text.

Assignable and LMS integration

Assignable adds readings, assessments, and supporting materials that instructors can place in their learning-management system. Auto-grading and automatic gradebook synchronization reduce routine marking and transfer work. LTI 1.3 support and integrations with Blackboard, Canvas, D2L Brightspace, and Moodle make it practical for institutions already using those systems. It is a separate paid product rather than an included part of the free book access.

Formats and access

Web reading, PDF downloads, annotation tools, and read-aloud support cover common study patterns across Android, iOS, and the web. Most reading remains open without registration, but account requirements for some titles and student features mean “free access” is not entirely account-free.

Pricing

Assignable includes a two-week free trial beginning on the first day of access, then charges per student for the semester. The textbook plan is the right choice for students and instructors who only need reading and teaching resources. Assignable suits instructors who need integrated coursework and grading, but its per-student fee makes it less attractive for courses that can manage work directly in an LMS.

Platforms

OpenStax supports Android, iOS, and web access, including desktop and mobile browsers. PDFs provide offline reading, while print editions offer a low-cost physical format.

Who it's for

Choose OpenStax when your introductory course matches its catalog and you want openly licensed material, free educator resources, and flexible digital or print access. It is especially suitable for budget-conscious students and instructors willing to build around the available books. Look elsewhere if your syllabus requires a title outside that catalog or if you need assignment features without a separate per-student charge.

Pros and cons

• Pro: Peer-reviewed books are free online and as PDFs, with affordable print editions.
• Pro: Educator accounts include test banks, slides, solutions manuals, and customization tools at no charge.
• Pro: Assignable connects through LTI 1.3 to major LMS platforms and automates grading and gradebook updates.
• Con: Some titles and student tools require an account, so access is not uniformly registration-free.
• Con: Assignable costs $15 per student per semester at its starting price after the two-week trial.
• Con: The accessibility report notes partially supported criteria in Assignable.

Alternatives

LibreTexts is a better fit for institutions wanting free textbook access plus ADAPT authoring and up to five custom textbooks per institution. SkillsCommons suits users who want a free repository for searching and downloading learning and workforce materials without an account. African Storybook focuses on openly licensed picture storybooks and free Reader and Maker apps. CK-12 FlexBook 2.0 offers free, customizable digital textbooks, with content varying by subject and book. DIKSHA provides free learning content through Sunbird-based open-source technology. Saylor Academy combines free self-paced courses and certificates with $5 one-time proctored exams. TU Delft OpenCourseWare offers free course materials without registration, university credit, or certificates. BCcampus Open Collection is aimed at materials the public can freely use, customize, and share.

For broader discovery, browse Open Educational Resource Platforms or Digital Textbook Platforms.

Verdict

OpenStax is a strong recommendation for introductory-course students and instructors who can use its peer-reviewed books and free teaching resources. Its combination of open PDFs, annotations, accessibility efforts, and optional LMS assignment automation is unusually practical. Look elsewhere when your course needs a different textbook catalog, or when Assignable’s per-student semester pricing outweighs its grading and synchronization benefits.