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Head-to-head · Google Workspace Teacher Resources Software

ReadWorks vs CK-12 FlexBook 2.0

  • Updated Sep 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score ReadWorks #4 in Google Workspace Teacher Resources Software 7.7/10 Free plan Free plan✓ 1 of 1 features Visit ReadWorks
CK-12 FlexBook 2.0 #5 in Google Workspace Teacher Resources Software 7.4/10 Free plan Free plan✓ 0 of 1 features Visit CK-12

ReadWorks leads on 1 check, CK-12 FlexBook 2.0 on 0, and 1 is even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreReadWorks · 7.7/10
  • Free planboth
  • Most featuresReadWorks · 1 of 1

ReadWorks scores higher on our rubric for google workspace teacher resources software: 7.7 against 7.4 out of 10; our editors rank them #4 and #5.

ReadWorks offers google classroom integration; CK-12 FlexBook 2.0 doesn't publish it.

ReadWorks is the better fit for free reading passages and comprehension practice. CK-12 FlexBook 2.0 is the better fit for free K–12 science lessons and practice.

  • ReadWorks fits best

    Free reading passages and comprehension practice

  • CK-12 FlexBook 2.0 fits best

    Free K–12 science lessons and practice

Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. It never changes our verdict. How we rank.

Side by side

Feature ReadWorks 7.7/10 Visit ↗ CK-12 FlexBook 2.0 7.4/10 Visit ↗
At a glance
Editor score 7.7 7.4
Ranking #4 in Google Workspace Teacher Resources Software #5 in Google Workspace Teacher Resources Software
Best for Free reading passages and comprehension practice Free K–12 science lessons and practice
Pricing model Free Free
Starting price Not published Not published
Free plan ✓ ✓
Free trial — —
Deployment Cloud Cloud
Platforms Web Web
Support Email Email, Community, Docs
Integrations 3 integrations 6 integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features ReadWorks 1/1 · CK-12 FlexBook 2.0 0/1
Google Classroom integration ✓ (best) Not published
Specs
Workspace apps Not published Not published
Resource types Reading passages, decodable texts, paired texts, Article-A-Day sets, Book Studies, vocabulary activities, question sets Not published
Resource library size 6000 resources Not published
Sharing controls Publish assignments to an imported Google Classroom class stream; invite students using a class code Not published
Our review
Pros
  • More than 6,000 fiction and nonfiction reading texts
  • Differentiation, automatic grading, and progress reporting
  • Google Classroom, Clever, and ClassLink integrations
  • 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.
Cons
  • Focused on reading rather than broad teacher resources
  • Web-only cloud deployment
  • Support is provided through email
  • 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.
Our verdict

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 →

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 →
  1. ReadWorksGoogle Workspace Teacher Resources Software 7.7Free plan
  2. CK-12 FlexBook 2.0Google Workspace Teacher Resources Software 7.4Free plan

Strengths and trade-offs

  • 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 2.0 — 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.
  • ReadWorks7.7/10 · Free plan

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

    Visit ReadWorksFull verdict →
  • CK-12 FlexBook 2.07.4/10 · Free plan

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

    Visit CK-12Full verdict →

More comparisons

All google workspace teacher resources software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

Last updated · How we research and update