CK-12 Adaptive Practice
Product by CK-12 Foundation
Facts checked: Not yet checked
Our take (not a Learning Standard rating). This label applies to learning-science judgments throughout this overview.
Our take (not a Learning Standard rating)
CK-12 Adaptive Practice effectively builds mastery through continuous retrieval practice and immediate feedback. The platform dynamically adjusts question difficulty based on student performance, preventing cognitive overload. While highly structured for math and science, it relies heavily on reading comprehension, which may frustrate younger learners or struggling readers.
Pros
- Adjusts question difficulty in real time to match student proficiency and maintain the zone of proximal development.
- Provides targeted hints and paragraph-level remediation text immediately after incorrect answers.
- Uses retrieval practice extensively across a massive library of STEM topics.
- Encourages mastery-based progression rather than simply scoring a fixed quiz.
Cons
- Relies heavily on text-based direct instruction, which demands high reading comprehension skills.
- Lacks varied multimedia worked examples for visual or auditory learners.
- Features minimal gamification elements, requiring high intrinsic motivation from the student.
- Not yet evaluated by The Learning Standard for longitudinal learning outcomes.
What Do We Know About CK-12 Adaptive Practice?
CK-12 Adaptive Practice is an effective tool for reinforcing math and science concepts through targeted repetition and immediate feedback. Your child will not find a highly gamified experience here; instead, they will engage with a rigorous, assessment-driven platform that tests their knowledge and corrects misconceptions in real time. The system excels at retrieval practice, prompting your child to recall information repeatedly, which learning science identifies as a primary driver of long-term retention. When your child answers a question incorrectly, the platform does not merely reveal the correct answer. It provides precise study suggestions, down to specific paragraphs of text, to help them understand the underlying concept. This prevents your child from guessing blindly and forces them to confront their knowledge gaps. However, parents should know that the instruction is heavily text-based. If your child struggles with reading comprehension, they may find the remediation materials frustrating. The platform operates on a mastery-based model, meaning your child must prove their competence before advancing to more difficult topics. This ensures foundational knowledge is solid before introducing complex ideas. While The Learning Standard has not yet officially evaluated this app, its structural reliance on adaptive difficulty and immediate corrective feedback aligns well with established cognitive science principles.
How Does CK-12 Adaptive Practice Work?
CK-12 Adaptive Practice uses competency-based learning combined with algorithmic personalized instruction to build student mastery in STEM subjects. The platform presents your child with practice questions drawn from a massive library of math and science topics. As your child answers questions, the system's algorithm continuously assesses their proficiency level. If your child answers correctly, the platform introduces more complex questions to challenge them. If your child struggles, the system dials back the difficulty to prevent cognitive overload and encourage success. This dynamic adjustment keeps students in their optimal learning zone. Beyond merely adjusting difficulty, the platform acts as an automated tutor. Incorrect responses trigger real-time hints and immediate corrective feedback. The system directs your child to specific reading materials or paragraphs to review the exact concept they missed. This creates a tight feedback loop where assessment immediately drives targeted direct instruction. Students must reach a specific mastery threshold before the system considers the topic complete, ensuring they actually understand the material rather than just completing a worksheet.
Strengths and tradeoffs of CK-12 Adaptive Practice
The biggest strength of CK-12 Adaptive Practice is its precise use of adaptive retrieval practice, while its biggest weakness is an over-reliance on dense, text-based remediation. Adaptive retrieval practice is central to the platform's effectiveness. By constantly adjusting the difficulty of questions based on real-time performance, the app prevents students from becoming bored by material that is too easy or overwhelmed by material that is too hard. This keeps learners in their zone of proximal development. Immediate corrective feedback is another major strength. When a student makes a mistake, the system provides targeted hints and directs them to specific paragraphs for review, a method proven to correct misconceptions before they encode in long-term memory. However, the platform's heavy reliance on text-based direct instruction presents a significant barrier. The remediation materials often lack robust multimedia worked examples, meaning students who struggle with reading comprehension will struggle to absorb the corrective feedback. Additionally, the minimal intrinsic motivation design means the platform relies on the student's own drive to learn. Without gamified elements or strong narrative engagement, younger students may fatigue quickly. Overall, the structural mechanics are scientifically sound, but the delivery format demands highly motivated, proficient readers.
Who Might Benefit From CK-12 Adaptive Practice?
CK-12 Adaptive Practice is best for highly motivated middle and high school students who need targeted, rigorous practice to solidify their math and science skills. Because the platform relies heavily on reading comprehension for its remediation suggestions, it is ideally suited for students in 6th through 12th grades who can process dense informational text independently. It serves as an excellent supplementary tool for classroom instruction, providing the necessary spaced repetition that teachers often lack the time to implement. Adult learners pursuing foundational STEM education will also appreciate the straightforward, non-childish interface and mastery-based progression.
Data Transparency
Does Not Meet Data Transparency Standard
CK-12 Adaptive Practice does not meet our data transparency standard. Its privacy policy does not document basic protections, including a statement that it does not sell data, a commitment against targeted advertising and a COPPA or FERPA commitment.
16 of 35 checks passed
Evaluated September 2026
Privacy Policy →Level 1 · Basic protections
Does not sell data or target ads at students, limits sharing, and lets parents see and delete their child's data.
Not documented: a statement that it does not sell data, a commitment against targeted advertising, a COPPA or FERPA commitment
Level 2 · Parent control (meets the standard)
Families can get their data out, know who processes it, and know how long it is kept.
Not documented: a data retention timeline, self-service deletion
Level 3 · Direct data access
Families or schools can pull their own data through an API, in a stated format.
Not documented: an API for retrieving their own data, a named export format
View all 35 checks
Parent Access5/8
Does the policy mention parents specifically?
“Children’s privacy is important to us. Younger visitors should always check with their parents or guardians before entering information online.”
Can parents view their child's data?
“Review the personal information we maintain about your child;”
Can parents modify their child's data?
The policy lets parents review, delete, or stop the use of their child's information, but it does not give parents a right to correct or modify it.
Can parents delete their child's account?
“Direct us to delete the personal information we maintain about your child; and”
Is there a dedicated Children's Privacy section?
“**2\. CHILDREN’S PRIVACY**”
Does it reference COPPA compliance?
The policy does not mention COPPA.
Does it reference FERPA compliance?
The policy calls some accounts "student records" but does not mention FERPA.
Is parental consent required for child accounts?
“If we become aware that a child user wants to access the Platform, we will take steps to obtain consent from their parent or guardian.”
Data Portability3/5
Can users access their personal data?
“If you are registered with us, you may log into your account to access and correct your account information.”
Can users download/export their data?
“You can ask us for a copy of your personal information and can ask for a copy of personal information to be provided in machine readable form.”
Is there a self-service data access tool?
“If you are registered with us, you may log into your account to access and correct your account information.”
Is a specific data format mentioned for export?
The policy only says "machine readable form" and names no specific file format.
Is there an API for data access?
The policy does not mention an API for getting data.
Data Minimization1/6
Is data collection itemized?
“If you are a student or teacher, we may collect information such as your name, telephone number, email address, mailing address, birth date, profile photo, demographic data, and account login information (i.e., username and password).”
Can the app be used without a real name?
The policy says it collects students' names.
Can the app be used without an email?
The policy says it collects students' email addresses.
Does it state collection is limited to what is necessary?
The policy does not say that collection is limited to what is necessary.
Is IP address anonymized or truncated?
The policy says it collects IP addresses and does not say they are anonymized or truncated.
Is location tracking explicitly excluded?
The policy says it collects IP address and city, and does not rule out location tracking.
Third-Party Protection5/7
Does it explicitly state no selling of data?
The policy does not say that CK-12 does not sell personal information.
Are third-party providers named?
“If you donate to us, we may collect from PayPal (our service provider) your name, contact information, and donation amount.”
Are providers contractually restricted?
“We take steps to prohibit our service providers from using your personal information for purposes outside of providing services to us.”
No-targeted-advertising commitment?
The policy does not promise that data is kept out of targeted advertising, and it mentions ads CK-12 places on third-party websites.
Is AI/ML data sharing addressed?
“We may also aggregate or deidentify information about users of our Platform to train AI models, understand usage trends, and gather opinions, comments, and suggestions about our Platform.”
Child-specific sharing restriction?
“To protect the privacy of children (see the definition above), certain functionality associated with a child’s account will be disabled to ensure that the child’s profile information (including profile photo) will not be visible to others on our Platform.”
Cookies/tracking limited or opt-out?
“For more information about Google Analytics and how to opt out, please visit [https://tools.google.com/dlpage/gaoptout/](https://tools.google.com/dlpage/gaoptout/).”
Deletion & Retention2/5
Can users delete their account?
“You may request to cancel your membership and have your account removed from our Platform. Please make all cancellation requests via email to [support@ck12.org](mailto:support@ck12.org).”
Self-service deletion mechanism?
The policy says account deletion must be requested by email, not done through a self-service tool.
Specific data retention timeline?
The policy keeps data for as long as an account exists or as needed, with no specific time limit.
Auto-deletion of inactive accounts?
The policy does not mention automatic deletion of inactive accounts.
Post-deletion handling described?
“We may anonymize your personal information after you have deactivated or deleted your account so that we can use this anonymized information for our internal business purposes.”
Advertising0/4
Advertising model explicitly disclosed?
The policy does not describe whether the product carries advertising; it only mentions ads CK-12 places on third-party websites.
Free from third-party advertisements?
The policy does not say the product is free of third-party ads.
Children excluded from ad targeting?
The policy does not say children are excluded from ad targeting.
Ad-free option available?
The policy does not say the product has no ads or offer an ad-free option.
What This Means
The policy review did not meet our data transparency standard. The checks above show the documented findings and unknowns. A missing statement does not establish how the app handles data in practice.
About this evaluation: Based on automated analysis of Privacy Policy against 35 policy-disclosure questions, including questions adapted from the Common Sense Privacy Program's published evaluation questions. TLS is not affiliated with Common Sense Media, and this is not a Common Sense rating. Quoted text is copied from the policy; unquoted notes are our summary. Results describe what the policy documents, not the company's actual practices. Privacy policies can change: this review reflects the version we analyzed and does not determine legal compliance.
Sources and review method
TLS combines product information and editorial analysis to explain how CK-12 Adaptive Practice works, its tradeoffs, and the questions to ask before choosing it. Product features, an instructional rationale and evidence of learning outcomes are different kinds of information.
Formal Learning Standard assessment: not yet completed. Data Transparency findings are reported separately and do not establish learning effectiveness. Read our methodology.
Frequently Asked Questions About CK-12 Adaptive Practice
Is CK-12 Adaptive Practice free?
Yes, CK-12 Adaptive Practice is completely free for educational purposes. The CK-12 Foundation operates as a non-profit organization dedicated to increasing access to high-quality educational materials. Users can access the full library of adaptive practice questions, digital textbooks, and text-based remediation tools without paying any subscription fees or encountering restrictive paywalls. This makes it an exceptional resource for school districts, homeschooling parents, and independent learners looking for cost-effective STEM enrichment.
Is CK-12 Adaptive Practice good for elementary students?
Partially, but it requires strong reading skills. While the platform offers content for grades 1 through 5, the interface and remediation tools rely heavily on text-based instructions and reading assignments. Younger students or those who struggle with reading comprehension will likely need significant adult support to navigate the feedback and understand the study suggestions. Parents of early elementary students may want to explore more visual, gamified alternatives for foundational math and science practice.
What does CK-12 Adaptive Practice teach?
CK-12 Adaptive Practice primarily teaches math and science concepts for elementary through high school levels, alongside some spelling and career tech education topics. The platform covers specific subjects like algebra, geometry, biology, chemistry, and physics. It functions primarily as a rigorous practice and reinforcement tool rather than a primary instructional curriculum, testing knowledge through varied question types to ensure true mastery over rote memorization.
How does CK-12 Adaptive Practice compare to Khan Academy?
Khan Academy heavily utilizes video-based direct instruction and multimedia worked examples, whereas CK-12 Adaptive Practice leans intensely on text-based reading materials and interactive digital textbooks. Both platforms utilize mastery-based learning and adaptive assessment to move students forward. Students who learn better through visual and auditory explanations may prefer Khan Academy, while strong readers who prefer scanning text for precise, paragraph-level remediation might prefer the structural approach of CK-12.
Has The Learning Standard evaluated CK-12 Adaptive Practice?
TLS has not yet completed a Learning Standard evaluation of how well CK-12 Adaptive Practice teaches. Its privacy policy has been reviewed for Data Transparency and does not yet document the basic protections (Level 1).
Is CK-12 Adaptive Practice COPPA compliant?
A COPPA reference was not found in the reviewed privacy policy. This does not determine whether the app complies with COPPA. Policy review note: The policy does not mention COPPA.
Is CK-12 Adaptive Practice FERPA compliant?
A FERPA reference was not found in the reviewed privacy policy. This does not determine whether the app complies with FERPA. Policy review note: The policy calls some accounts "student records" but does not mention FERPA.
Does CK-12 Adaptive Practice have a children's privacy policy?
The reviewed policy includes a dedicated children's privacy section. Policy review note: The policy has its own section headed Children's Privacy.
Does CK-12 Adaptive Practice sell student data?
A statement ruling out data selling was not found in the reviewed policy. This does not establish that the app sells student data. Policy review note: The policy does not say that CK-12 does not sell personal information.
Can you delete your data from CK-12 Adaptive Practice?
The reviewed privacy policy describes account deletion. We have not tested the deletion process. Policy review note: Users can ask to have their account removed.
Follow TLS Research
Subscribe to future TLS research updates: app reviews, findings, and what the evidence shows.
Screenshots
Take Action
For CK-12 Adaptive Practice
If you represent CK-12 Foundation and have a correction or new evidence, send the relevant source so we can review and update this page.
Submit a correctionDetails
- Pricing
- Free for educational purposes
- Platforms
- Web Browser, iOS (Apple mobile), iPadOS (Apple tablet), Android (Google mobile), Windows (Microsoft), macOS (Apple), Chrome OS (Google), Other
- Grade Levels
- 1st Grade, 2nd Grade, 3rd Grade, 4th Grade, 5th Grade, 6th Grade, 7th Grade, 8th Grade, 9th Grade, 10th Grade, 11th Grade, 12th Grade, Associate's degree, Adult Education
- Website
- Visit site