CK-12 PLIX Interactives
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 PLIX Interactives effectively build conceptual understanding in math and science through active exploration. By manipulating variables in dynamic simulations, students engage in experiential learning that builds accurate mental models. However, these tools work best as supplements to direct instruction rather than standalone teaching tools.
Pros
- Allows students to manipulate variables in real-time to observe cause-and-effect relationships.
- Integrates interactive exploration with higher-order assessment questions to verify understanding.
- Provides immediate links to text-based lessons for students who need direct instruction.
- Requires active cognitive engagement rather than passive video consumption.
Cons
- Lacks structured scaffolding for students who lack prior background knowledge in a subject.
- Feedback on incorrect answers does not consistently explain the underlying misconception.
- Does not adapt the difficulty of assessment questions based on student performance.
What Do We Know About CK-12 PLIX Interactives?
CK-12 PLIX Interactives are effective supplemental tools for helping your child visualize complex math and science concepts. Rather than reading about physics or geometry, your child actively manipulates digital models to see how changing one variable impacts another. This approach grounds abstract ideas in experiential learning. The app does not teach a full curriculum from scratch. Instead, it assumes your child has some foundational knowledge and provides an interactive sandbox to test that knowledge. For example, if your child is learning about the Pythagorean theorem, they will drag points on a digital triangle to see how the mathematical formula holds true across different dimensions. The inclusion of challenge questions after the interactive activity forces your child to engage in retrieval practice, pulling the information from memory to solidify learning. However, because the interactives lack built-in guided instruction, a struggling student may click around aimlessly without grasping the learning objective. You should use this tool alongside traditional lessons, ensuring your child reads the provided text summaries before attempting the interactive challenges.
How Does CK-12 PLIX Interactives Work?
CK-12 PLIX Interactives rely on experiential learning and active discovery to teach STEM concepts. Each module presents a single concept through a digital simulation. A student might adjust the angle of a digital ramp to see how friction and gravity affect a sliding block. After the exploration phase, the system prompts the student with a series of multiple-choice and open-ended questions. This forces learners to analyze what they just observed, shifting them from passive observation to active cognitive processing. If a student struggles with the questions, the platform provides a direct link to a traditional, text-based lesson covering the specific concept. The mechanics intentionally separate the direct instruction from the interactive practice, requiring the student to toggle between reading and doing. The interactives do not adapt in difficulty based on performance, but they offer an unstructured environment for self-directed inquiry.
Strengths and tradeoffs of CK-12 PLIX Interactives
The biggest strength of CK-12 PLIX Interactives is their ability to make abstract concepts concrete through interactive modeling, while their biggest weakness is the lack of embedded instructional scaffolding for struggling learners. By letting students manipulate variables and immediately see the results, the platform heavily leverages experiential learning. This builds robust mental models of difficult scientific phenomena, such as wave mechanics or cellular respiration. Furthermore, the mandatory question sets at the end of each module require retrieval practice, forcing students to recall and apply what they just observed. Self-directed exploration is highly effective for students who already possess baseline knowledge. However, the open-ended nature of the simulations presents a challenge. Without guided worked examples or step-by-step instructions built directly into the interactive, novices may experience cognitive overload. They might move sliders and push buttons without connecting those actions to the underlying mathematical or scientific principles. While the platform does link to external reading materials, the lack of immediate, targeted feedback during the simulation itself means students can easily reinforce misconceptions if they are not monitored by an educator.
Who Might Benefit From CK-12 PLIX Interactives?
Best for middle and high school students who need visual, hands-on supplements to their standard math and science curriculum. The platform targets learners in grades 6 through 12, as well as adult learners, who already receive primary instruction in a classroom or structured homeschool setting. It is highly effective for students who struggle to understand abstract formulas but thrive when given the opportunity to manipulate physical or digital models. Independent learners who are self-motivated enough to read the companion text lessons will get the most value from these interactives.
Data Transparency
Does Not Meet Data Transparency Standard
CK-12 PLIX Interactives 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 change 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?
“Children’s privacy is important to us. Younger visitors should always check with their parents or guardians before entering information online.”
Does it reference COPPA compliance?
The policy does not mention COPPA.
Does it reference FERPA compliance?
The policy refers to "student records" but never mentions 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 says only "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 and may receive student information from schools.
Can the app be used without an email?
The policy says it collects students' email addresses, including school 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; the only such limit it mentions applies to parent consent data.
Is IP address anonymized or truncated?
The policy says it collects IP addresses and does not say they are anonymized or shortened.
Is location tracking explicitly excluded?
The policy says it collects the user's city from their device 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 makes no promise against targeted advertising and 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 requests must be sent by email, with no self-service option.
Specific data retention timeline?
The policy keeps data for as long as the account exists or as needed, and gives no specific time limit.
Auto-deletion of inactive accounts?
The policy does not mention automatically deleting 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 mentions ads CK-12 places on third-party websites but does not say whether the product itself shows ads.
Free from third-party advertisements?
The policy does not say whether the product is free of third-party ads.
Children excluded from ad targeting?
The policy does not say that 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 PLIX Interactives 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 PLIX Interactives
Is CK-12 PLIX Interactives free?
Yes, the platform is entirely free for educational purposes. The CK-12 Foundation is a non-profit organization, so parents and educators can access the full library of over 1,200 interactives without subscription fees or paywalls.
Is CK-12 PLIX Interactives good for middle and high schoolers?
Yes, it is specifically designed for students in grades 6 through 12, as well as adult learners. The concepts covered align with middle and high school learning standards and require a baseline level of reading comprehension and mathematical reasoning.
What does CK-12 PLIX Interactives teach?
The platform teaches core concepts in math, science, and Career & Technical Education. It focuses on visual problem solving and conceptual understanding in subjects like algebra, biology, earth science, and physics through digital simulations.
How does CK-12 PLIX Interactives compare to PhET Interactive Simulations?
Both platforms offer excellent STEM simulations, but they differ in structure. PhET simulations are generally more open-ended, functioning purely as digital lab equipment. CK-12 PLIX Interactives deliberately pair the interactive element with assessment questions and text-based lessons to ensure comprehension.
Has The Learning Standard officially rated CK-12 PLIX Interactives?
No, CK-12 PLIX Interactives is currently pending evaluation. Our team has not yet run this specific tool through our full rubric. You can read more about how we assess ed-tech products on our methodology page.
Has The Learning Standard evaluated CK-12 PLIX Interactives?
TLS has not yet completed a Learning Standard evaluation of how well CK-12 PLIX Interactives teaches. Its privacy policy has been reviewed for Data Transparency and does not yet document the basic protections (Level 1).
Is CK-12 PLIX Interactives 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 PLIX Interactives 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 refers to "student records" but never mentions FERPA.
Does CK-12 PLIX Interactives have a children's privacy policy?
The reviewed policy includes a dedicated children's privacy section. Policy review note: This sentence is from Section 2, which has its own heading, "CHILDREN’S PRIVACY".
Does CK-12 PLIX Interactives 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 PLIX Interactives?
The reviewed privacy policy describes account deletion. We have not tested the deletion process. Policy review note: Users can ask for their account to be removed.
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- Pricing
- Free for educational purposes
- Platforms
- Web Browser, iPadOS (Apple tablet), Windows (Microsoft), macOS (Apple), Chrome OS (Google), Other
- Grade Levels
- 6th Grade, 7th Grade, 8th Grade, 9th Grade, 10th Grade, 11th Grade, 12th Grade, Associate's degree, Adult Education
- Website
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