CK-12 FlexBook 2.0 vs ReadWorks

CK-12 FlexBook 2.08.5Visit ReadWorks7.9Visit

Higher score CK-12 FlexBook 2.0 #4 in Google Workspace Teacher Resources Software 8.5/10 Free plan Free plan✓ 0 of 1 features Visit CK-12

vs

ReadWorks #6 in Google Workspace Teacher Resources Software 7.9/10 Free plan Free plan✓ 1 of 1 features Visit ReadWorks

• CK-12 FlexBook 2.0 fits best

  Free K–12 science lessons and practice

• ReadWorks fits best

  Free reading passages and comprehension practice

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Side by side

Feature	CK-12 FlexBook 2.0 8.5/10 Visit ↗	ReadWorks 7.9/10 Visit ↗
At a glance
Editor score	8.5	7.9
Ranking	#4 in Google Workspace Teacher Resources Software	#6 in Google Workspace Teacher Resources Software
Best for	Free K–12 science lessons and practice	Free reading passages and comprehension practice
Pricing model	Free	Free
Starting price	Free plan	Free
Free plan	✓	✓
Free trial	—	—
Deployment	Cloud	Cloud
Platforms	Web	Web
Support	Email, Community, Docs	Email
Integrations	6 integrations	3 integrations
Built for	Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features CK-12 FlexBook 2.0 0/1 · ReadWorks 1/1
Google Classroom integration	Not checked yet	✓ (best)
Specs
Workspace apps	Not checked yet	Not checked yet
Resource types	Not checked yet	Reading passages, decodable texts, paired texts, Article-A-Day sets, Book Studies, vocabulary activities, question sets
Resource library size	Not checked yet	6000 resources
Sharing controls	Not checked yet	Publish assignments to an imported Google Classroom class stream; invite students using a class code
Our review
Pros	Customizable FlexBooks let teachers rearrange chapters and add materials. Interactive lessons include videos, simulations, PLIX activities, and practice. Google Classroom and LMS integrations support assignments and grade passback.	More than 6,000 fiction and nonfiction reading texts Differentiation, automatic grading, and progress reporting Google Classroom, Clever, and ClassLink integrations
Cons	Its verified subject scope is limited to K–12 science. The platform is delivered through a web browser rather than native apps. LMS connectivity is centered on a defined set of supported integrations.	Focused on reading rather than broad teacher resources Web-only cloud deployment Support is provided through email
Our verdict	CK-12 FlexBook 2.0 is a browser-based platform for students, teachers, parents, and schools seeking free K–12 science curriculum. Teachers can customize digital textbooks, rearrange chapters, add materials, assign lessons, create quizzes,… Read the review →	ReadWorks is a nonprofit reading-comprehension platform for teachers and students in K–12 settings. Its searchable library combines fiction and nonfiction passages with paired texts, decodable texts, Book Studies, Article-A-Day sets,… Read the review →

Strengths and trade-offs

• CK-12 FlexBook 2.0 — where it wins

  • Customizable FlexBooks let teachers rearrange chapters and add materials.
  • Interactive lessons include videos, simulations, PLIX activities, and practice.
  • Google Classroom and LMS integrations support assignments and grade passback.

  Where it doesn't

  • Its verified subject scope is limited to K–12 science.
  • The platform is delivered through a web browser rather than native apps.
  • LMS connectivity is centered on a defined set of supported integrations.

• ReadWorks — where it wins

  • More than 6,000 fiction and nonfiction reading texts
  • Differentiation, automatic grading, and progress reporting
  • Google Classroom, Clever, and ClassLink integrations

  Where it doesn't

  • Focused on reading rather than broad teacher resources
  • Web-only cloud deployment
  • Support is provided through email

• CK-12 FlexBook 2.08.5/10 · Free plan

  A free K–12 science platform combining editable textbooks, simulations, practice, and assessment tools.

  Visit CK-12Full verdict →
• ReadWorks7.9/10 · Free plan

  A free, reading-focused library with assignments, differentiation, and progress reporting.

  Visit ReadWorksFull verdict →