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CK-12 FlexBook 2.0 alternatives
CK-12 FlexBook 2.0 gives K–12 educators customizable digital textbooks across science, math, social studies, and other subjects. Lessons combine written material with PLIX interactives, simulations, adaptive practice, and related resources. Teachers can assign content to whole classes or differentiated groups, review progress reports, and reorder chapters or edit material. Adaptive Practice adjusts questions from a library exceeding 150,000 items according to student answers. The free service works on Android, iOS, and the web, including browsers on computers, Chromebooks, tablets, and mobile devices.
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Kotobee Author
Free plan AndroidiPhoneLinux+3Interactive ebook creation and branded exports — Kotobee Author creates interactive ebooks with AI tools, custom code, branding, auto-graded questions, and more than 12 export formats.
Free plan · paid from $150 Visit site - 2
VitalSource Bookshelf
Free plan AndroidiPhoneMac+2Offline eTextbook reading and study tools — VitalSource Bookshelf focuses on reading and studying eTextbooks, adding notes, flashcards, citations, read aloud, and offline title downloads.
Pricing on request Visit site - 3
ePathshala
Free plan AndroidiPhoneWeb+1Free Indian curriculum resources with QR links — ePathshala provides Ministry of Education and NCERT resources in ePub and flipbook formats, with QR-linked multimedia and digital notes.
Free plan Visit site - 4
LibreTexts
Free plan AndroidiPhoneWebOpen textbooks and large assessment banks — LibreTexts offers 17 subject libraries, over 2,000 textbooks, remixing, and ADAPT assessment with more than 240,000 openly licensed elements.
Free plan · paid from $15/mo Visit site - 5
DIKSHA
Free plan Open source AndroidAPIiPhone+3Indian school content across 36 languages — DIKSHA organizes curriculum materials by subject, stage, board, and grade, adds textbook QR scanning, and supports teacher development courses.
Free plan Visit site - 6
Interactive Textbooks Digital Library
Free plan iPhoneWebOfficial school books with accessible formats — Interactive Textbooks Digital Library provides official Greek school books in PDF, HTML, interactive HTML, iBook, and low-vision formats.
Free plan Visit site - 7
OpenStax
Free plan AndroidAPIiPhone+1Peer-reviewed introductory higher-education textbooks — OpenStax publishes openly licensed, peer-reviewed textbooks with instructor resources and Assignable LMS assignments, auto-grading, and gradebook sync.
Free plan Visit site - 8
Edpuzzle
Free plan AndroidExtensioniPhone+1 - 9
BookWidgets
Free plan iPhoneWeb - 10
Nearpod
Free plan AndroidAPIExtension+5 - 11
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Wayground (formerly Quizizz)
Free plan AndroidExtensioniPhone+4 - 14
Pear Deck
Free plan ExtensionWeb - 15
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Clever
Free plan WebWindows - 17
Equatio
Free plan AndroidiPhoneMac+2 - 18
Kurzweil 3000
Free trial ExtensionMacWeb+1 - 19
Goobric
Free plan Web - 20
Kami
Free plan Web - 21
IMTLazarus
Paid AndroidiPhoneMac+2 - 22
Edia
Paid Web - 23
Hāpara Student Dashboard
Paid AndroidiPhoneWeb - 24
GAT Labs
Paid Web
An alternative may fit better when CK-12’s coverage, downloads, or device requirements get in the way. CK-12 is still converting core content, interactive elements may not appear in downloaded PDFs, and CK-12-created PDFs cannot be downloaded. Standalone simulations and PLIX Interactives require a tablet-size screen or larger. Compare whether you need ebook creation and export, an extensive reading catalog, national curriculum resources, open-license textbooks, QR-linked lessons, official school-book collections, additional languages, offline access, or different LMS and assessment workflows. Pricing and supported platforms also matter when moving from CK-12’s free plan.
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