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Flexi, from CK-12, is a free AI tutor that makes math and science fun for middle and high schoolers! It answers questions with step-by-step explanations, offers interactive simulations, videos, and real-world examples, and tailors lessons to your pace. Features include adaptive practice quizzes, a personalized study plan, 24/7 support across devices, and a reflection dashboard to track progress. Flexi sparks curiosity with engaging questions, helps with homework, and preps for tests, all in 300+ languages. It is perfect for students boosting grades, teachers enhancing lessons, or parents supporting learning.

Key Features of Flexi

  • Personalized Practice: Adapts questions to student skill levels with real-time feedback.
  • AI-Powered Tutoring: Answers questions and provides interactive examples.
  • Bite-Sized Lessons: Breaks concepts into manageable, engaging chunks.
  • Interactive Content: Includes videos, simulations, and PLIX interactives.
  • Progress Tracking: Monitors learning and identifies knowledge gaps.
  • Multi-Subject Support: Covers math (algebra, geometry) and science (biology, physics).
  • Device Accessibility: Works seamlessly on desktops, tablets, and phones.

Use Cases for Flexi

  • K-12 Students: Master STEM subjects with tailored practice for exams.
  • Homeschoolers: Access free, structured resources for self-paced learning.
  • Teachers: Assign adaptive practice to support classroom instruction.
  • Parents: Supplement kids’ learning with an affordable tutor alternative.
  • Adult Learners: Review math or science for career or personal growth.

ai tool pricing icon  Flexi pricing 2025: Plans, Features, and Subscription Costs Explained

  • Free
  • $0

review and rating icon for ai tools  Flexi Reviews & Ratings: See What Users and Experts Are Saying

Our Verdict

(4.3/5)

Flexi is a fantastic, free tool that brings personalized STEM learning to everyone. Whether you’re a student, teacher, or homeschooling parent, it’s worth a spin.

Accuracy and Reliability : 4.5/5
Ease of Use : 4/5
Functionality and Features : 4.5/5
Performance and Speed : 4/5
Customization and Flexibility : 4/5
Data Privacy and Security : 4.5/5
Support and Resources : 4/5
Cost-Efficiency : 5/5
Integration Capabilities : 4/5

User Reviews

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faqs icon for ai toolsFlexi FAQ: Learn How to Use It, Troubleshoot Issues, and More

What is Flexi AI tutor?

A free AI tool for K-12 STEM, offering personalized practice and tutoring.

Is Flexi free to use?

Yes, Flexi is 100% free, with no hidden costs for students or teachers.

Can Flexi help with algebra?

Yes, it offers adaptive algebra practice and interactive lessons.

How does Flexi personalize learning?

It adjusts questions and content based on your skill level and progress.

Is Flexi safe for student data?

CK-12 uses strong encryption to protect user information.

Does Flexi work on mobile devices?

Yes, it’s fully accessible on phones, tablets, and desktops.

Can Flexi help with science exams?

It provides practice quizzes and simulations for biology, physics, and more.

How easy is Flexi to use?

Its clean design is user-friendly, though setup may take some learning.

Does Flexi integrate with Google Classroom?

Yes, it syncs with Google Classroom, Canvas, and other LMS platforms.

Can teachers track progress on Flexi?

Teachers can assign tasks and monitor student performance in real-time.


Disclaimer: The content on this website is written and reviewed by experts in the fields of Artificial Intelligence and Software. Additionally, we may incorporate public opinions sourced from various social media platforms to ensure a comprehensive perspective. Please note that the screen shots and images featured on this website are sourced from Flexi website. We extend our gratitude and give full credit to Flexi for their valuable contributions. This page may include external affiliate links, which could earn us a commission if you decide to make a purchase through those links. However, the opinions expressed on this page are our own, and we do not accept payment for favorable reviews.