The best alternatives to CK-12 Flexi
CK-12 Flexi might not be the right fit: the price, a missing feature or a payment model you don't like. These are the closest alternatives in our catalog, ordered by rating, with the full review of each one.
Why look for a CK-12 Flexi alternative
There is no dated fact this week that moves the axes either: Flexi is still free, with no ads and no in-app purchases, and the question of whether they will ever charge still goes unanswered on its own FAQ page. The Apple App Store listing stays at 4.1 out of 11 ratings, with a minor update on August 10 that only adds deep links. What is new is the teacher-facing layer, an assistant that connects to Google Classroom, Canvas and Schoology, confirmed by independent trade press, and a privacy policy that spells out how it asks for consent when it detects a minor.
What its own users repeat in the August 23, 2026 sweep:
- It answers first and teaches second: its public pages open with the formula solved, and an independent evaluation sums it up as being «built to answer fast» (strong theme)
- The language model is a third party's and the launch press release says so, so the intelligence side is not house technology (strong theme)
- Teachers using it miss a way to check whether the student understood: there is no way to confirm assignments were finished correctly (present theme)
- Reading photographs of exercises fails often, and it is a recurring complaint in real user reviews (present theme)
- Its own overview page leaves the FAQ block unwritten, filled with placeholder text, and the unanswered question is precisely whether they will ever charge for Flexi (present theme)
- The fit with curricula outside the United States is uneven, and teacher reviews say so in those words (present theme)
Best alternatives to CK-12 Flexi
A Copilot study agent for learners aged 13+ with an education licence.
Khan Academy's Socratic tutor for learners and families in the United States.
What the internet says about each alternative
Microsoft Study and Learn 4.4/5 · Free
Microsoft Study and Learn is still free with any Microsoft 365 Education licence (A1, A3 or A5), and its privacy policy is unchanged: conversations do not train the models and teachers cannot see a student's activity unless the student shares it. This week's news is an independently confirmed product update: conversations can now include a carousel of web-searched images to support understanding, and the deployment documentation clarifies that once a school sets up the tenant, the agent is on by default for students with no separate activation step. It still has no mobile app, and July's finding about broken reference links (around 25%) still has no second source confirming it.
Where it wins: Works with a learner's own PDFs, slides and documents and generates active practice. An independent review confirms it guides the learning process better than normal Copilot mode Where it slips: Only available to Microsoft 365 Education users aged 13 or older, with launch optimisation focused on US English
Khanmigo 4.3/5 · From $4
Khanmigo's price stays unchanged ($4/month or $44/year, still requiring US residence and billing). On August 27, 2026, Khan Academy shipped Gemini-powered interactive diagrams inside Khanmigo, in partnership with Google.org, already available to school districts and independently confirmed by EdTech Innovation Hub: the integration axis moves up. The same week, Sal Khan publicly acknowledged the low-adoption problem the NBER study had already documented and committed that every partner district will use the redesigned experience this school year, a genuinely new development not present in the previous sweep. That contrast, a new feature already shipped against an admitted, still-unsolved problem, is captured in the weekly mood block and pulls the final score slightly down despite the integration gain.
Where it wins: Socratic tutor integrated with Khan Academy exercises and content: the guided approach, instead of a direct answer, is exactly what a 2024 Wharton study links to better exam retention compared with unrestricted AI Where it slips: Access, features and price vary across learner, family, teacher and district plans
Comparison table
| Tool | Price | Free trial | Platforms | Rating | Link |
|---|---|---|---|---|---|
| CK-12 Flexi | Free | No | Web, iOS, Android, Chrome | VisitCK-12 Flexi (opens in a new tab) | |
| Microsoft Study and Learn | Free | No | Web, Windows | VisitMicrosoft Study and Learn (opens in a new tab) | |
| Khanmigo | From $4 | No | Web | VisitKhanmigo (opens in a new tab) |
Still unsure? Read the full review of CK-12 Flexi?