OpenStax

OpenStax is a nonprofit education initiative of Rice University that publishes free, openly licensed textbooks and educational materials for introductory courses. The textbooks are written by subject matter experts, peer-reviewed for accuracy, and updated regularly. Readers can use them online on web, Android, and iOS devices or download free PDFs; low-cost print editions are also offered. Most titles are available without an account, though a small number require sign-in. Students can highlight, take notes, and create study guides, with select features requiring a free student account; read-aloud support is available. Educators can create a free account for resources such as test banks, PowerPoint slides, solutions manuals, and customization tools. OpenStax Assignable lets instructors set readings, assessments, and supporting materials through an LMS, with auto-grading and automatic gradebook sync. It supports LTI 1.3 and Blackboard, Canvas, D2L Brightspace, and Moodle. Assignable is free for instructors and starts at $15, paid once, billed per student per semester, with a two-week free trial from the first day of access. OpenStax says its digital materials strive to meet WCAG 2.2 AA standards; its September 2025 Assignable report identifies some criteria as partially supported.

OpenStax offers free textbooks alongside educator resources and a paid assignment tool. Check account requirements for specific books and student features, and review Assignable's accessibility report if those criteria matter to your course.

OpenStax suits students seeking introductory course materials and instructors looking for textbook resources or LMS-based assignments. Students needing select book tools should note that some require a free account.

OpenStax is a nonprofit Rice University initiative offering openly licensed textbooks and course tools for introductory subjects. It fits students seeking no-cost core reading and instructors building courses around established open materials. The strongest case is free, peer-reviewed content; the main trade-off appears when a course needs assignment workflows, which move into Assignable’s paid model.

Overview

OpenStax began as Connexions in 1999 and adopted its current name in 2012. Its subject-matter experts write the books, reviewers check them for accuracy, and the organization updates them regularly. Most titles can be read without an account, while a small number require sign-in. Students can read online on any device or download free PDFs for offline use; low-cost print editions provide a physical option.

Reading tools include highlighting, notes, and study-guide creation. Select student features require a free account, so students should create one when a course depends on those functions. OpenStax says its digital materials strive for WCAG 2.2 AA conformance and provides read-aloud support. Its support team answers textbook, educator-resource, and Assignable questions through a support center or email.

Key features

Textbooks and instructor materials

A free educator account provides test banks, PowerPoint slides, solutions manuals, and customization tools. Those resources can shorten course-preparation time and support assessments without adding a textbook bill, but their usefulness depends on finding an OpenStax title that matches the course’s scope and sequence.

Assignable

Assignable lets instructors place readings, assessments, and supporting materials in an LMS, then auto-grade work and synchronize grades with the gradebook. LTI 1.3 support and integrations with Blackboard, Canvas, D2L Brightspace, and Moodle make it a practical extension for institutions already using those systems. It is less compelling for instructors who only need downloadable books or who do not use a supported LMS.

Accessibility and accounts

OpenStax’s digital materials target WCAG 2.2 AA, while the September 2025 Assignable accessibility report evaluates Levels A and AA and identifies some criteria as partially supported. Courses with strict accessibility requirements should review that report before adopting Assignable. Most reading is open without registration, but account requirements vary by title and by student feature.

Pricing

The textbook plan is the clear fit for students and instructors who can use the books independently. Assignable’s charge is billed per student, per semester, not as a one-time lifetime license despite the plan’s “per once” display. A two-week free trial starts on the first day of access, giving instructors time to assess the workflow before paying. The free educator account covers teaching resources, while student access to selected tools still requires a free account.

Platforms

OpenStax supports Android, iOS, and the web across desktop and mobile devices. Online books work on any device, and PDF downloads provide offline reading. The mixed access model combines account-free reading for most titles with sign-in requirements for some books and features.

Who it's for

Choose OpenStax when an introductory course aligns with its catalog and keeping student material costs low matters. It also suits instructors who want peer-reviewed books plus ready-made tests, slides, solutions, and customization options. Assignable is a better fit for courses that need LMS-native assignments, auto-grading, and gradebook synchronization. Look elsewhere when a course requires a specialized commercial textbook, when unsupported LMS infrastructure is central, or when partially supported accessibility criteria are unacceptable.

Pros and cons

Pros

• Free core access: Online books and PDFs cost nothing, with print editions still offered at low cost.
• Academic review process: Subject experts write the books, peer reviewers check accuracy, and regular updates help keep introductory content current.
• Useful instructor package: Test banks, slides, solutions manuals, and customization tools are unlocked through a free educator account.
• Flexible student reading: Web, mobile, PDF, annotation, study-guide, and read-aloud options support different study habits.
• LMS workflow: Assignable combines LTI 1.3 integrations with auto-grading and automatic gradebook sync.

Cons

• Catalog fit governs value: The free model works best only when an appropriate OpenStax introductory title exists.
• Accounts are inconsistent: Most books are open, but some titles and student features require free sign-in.
• Assignable adds recurring cost: It starts at $15 per student per semester after a two-week trial, with institutional pricing requiring contact.
• Accessibility needs checking: The Assignable report lists some WCAG A and AA criteria as partially supported.

Alternatives

LibreTexts is the better choice for institutions wanting free textbook access, ADAPT instructor access, H5P and ADAPT authoring, and up to five custom textbooks per institution.

African Storybook suits readers seeking thousands of openly licensed picture storybooks with free Reader and Maker apps rather than introductory college textbooks.

DIKSHA is a free, Sunbird-based open-source option designed for iPad and available across Android, iOS, and web.

Saylor Academy fits learners who want 164 self-paced free courses and certificates, with proctored exams priced at $5 per exam.

SkillsCommons is a free repository for browsing and downloading learning and workforce materials without an account.

CK-12 FlexBook 2.0 is a free online customizable digital textbook platform whose content varies by subject and book.

Lumen Learning is the alternative for supported Lumen courses with a $35 per-student/term course fee or a $350 Success Accelerator plan.

StoryWeaver is a web-only free platform for reading, creating, translating, and downloading children’s books.

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

Verdict

OpenStax is an excellent choice for students and introductory-course instructors who can build around its peer-reviewed, freely downloadable textbooks. Choose it for zero-cost reading and substantial free educator materials; look elsewhere when your course needs a different catalog, a fully managed commercial platform, or accessibility guarantees beyond Assignable’s documented support.