Which textbooks and subjects does OpenIntro offer?

OpenIntro publishes free, openly accessible textbooks in two main subject areas: statistics and mathematics. The statistics catalog is the more established one, with several titles for high school and college courses; the mathematics catalog is newer, and at least one title is available through a pilot program rather than as a fully launched offering. All books are described as free to access as PDFs, with affordable print editions also sold.

Statistics textbooks

OpenIntro's statistics list covers introductory courses at both the high school and college levels, plus a title aimed at life and biomedical science students:

• OpenIntro Statistics — the flagship introductory statistics textbook.
• Introduction to Modern Statistics — an introductory statistics text with a modern approach.
• Intro Stat for Life & Biomedical Sciences — introductory statistics oriented toward life and biomedical science students.
• Advanced High School Statistics — a statistics text for advanced high school courses.
• Intro Stat with Randomization and Simulation — an introductory statistics text built around randomization and simulation methods.

These titles are the core of what OpenIntro is known for, and the site notes that each book has been used successfully at a wide range of schools.

Mathematics textbooks

The mathematics offerings are grouped separately and include:

• College Algebra and Trigonometry
• APEX Calculus
• Linear Algebra

One important condition: the site states that mathematics content is "now available via a pilot program." That means these mathematics titles should be treated as pilot-stage offerings rather than as settled, fully launched products in the same way as the statistics line. If you are choosing a book for a course, check the current status of the specific mathematics title before adopting it.

How the books are organized and supported

OpenIntro structures its catalog around intro-level textbooks for high school and college, split into the Statistics and Mathematics sections. Beyond the books themselves, the site says it features supporting resources such as slides and videos.

For instructors, there is a separate Teacher Access path: teachers who become verified can request desk copies, gain access to solutions for the statistics textbooks, review sample exams, and more. This is relevant if you are evaluating a book for adoption and need answer keys or exam samples — those materials are gated behind teacher verification rather than openly available.

Choosing between the titles

The right pick depends on your course level and subject:

For statistics, the choice mostly comes down to course level and teaching approach (traditional vs. modern vs. simulation-based). For mathematics, confirm pilot status and current availability before committing, since the site presents these as part of an ongoing pilot program rather than as fully mature offerings.

A practical next step is to open the specific book's page, review its table of contents against your syllabus, and — if you teach — register for verified teacher access to see solutions and sample exams before adopting.