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Khan is a library. Brainback is a coach.
what Khan Academy is
The open-education library that changed what free learning could mean.
Khan Academy is one of the great open educational resources. Its library of videos and exercises covers K–12 through early undergraduate — 10,000+ hours of content, all free. Its founder built it because his cousin needed math tutoring and he was in another state.
Brainback is different. It's not a library — it's a personal coach that works with your existing materials (Khan videos included) and enforces active practice around whatever you're learning.
The best possible workflow for many students runs both: Khan for the concept exposition, Brainback for the reasoning practice, spaced recall, and Brain score. Khan tells you what a derivative is; Brainback makes sure you can actually take one.
A student asks the same question of both products. The responses diverge in seconds. The consequences diverge in weeks.
AP Calc — 'derivative of e^(3x) sin(x)'
Video: watch a 4-minute explainer on product rule + chain rule. Then Khan practice problems in the unit.
Attempt required. Once given: 'e^(3x) sin(x)' correction: 'you have the shape but you're missing the chain-rule factor from the first term's derivative. What does d/dx of e^(3x) actually equal?'
No cherry-picked wins. Where Khan Academy does something we don’t, we say so. Where we do something they don’t, same.
| feature | brainback | khan academy |
|---|---|---|
| Video content library | No | Yes, extensive |
| Personal Socratic tutor | Yes | Khanmigo (limited) |
| Attempt-gate enforcement | Yes, server-side | No |
| Spaced recall of your errors | Yes, auto-generated cards | Basic; unit-based |
| Weekly Brain score | Yes | Unit mastery levels |
| Works with your existing curriculum | Yes — any syllabus, any textbook | Khan-specific |
| Explain-back grading | Yes, 0–5 | No |
| Free tier | Yes (15 msgs/day, 3 reviews/day) | Yes (all core content) |
| Paid tier | $9.99/mo Student (unlimited) | Optional donation |
Monthly prices are how tools get marketed. Annual bills are how they get budgeted. Both matter.
| line item | brainback | khan academy |
|---|---|---|
| Monthly price | $0 free / $9.99/mo Student | $0 (optional donation) |
| Annual | $0 free / $59 annual | $0 |
Khan Academy is free forever. Brainback has a real free tier. A budget-constrained student can use both at $0/mo through a full HS curriculum.
You’re not just changing tools. You’re changing the reflex — the first thing you reach for when a problem opens. Below is the sequence that works.
Khan is the concept library; Brainback is the practice engine. Both surfaces are worth using.
For any new concept in your course, start with a Khan video. It's a free, curated, well-taught intro.
Once you've watched the exposition, don't do the Khan practice — do a Learn session on the same concept. The attempt-gate + hint ladder train reasoning; passive Khan practice doesn't.
Paste any Khan problem into Brainback as your attempt starter. The tutor takes it from there.
Khan gives you unit mastery levels. Brainback gives you a weekly Brain score decomposed by subject. The two together are a full progress picture.
Keep both. Khan is genuinely free and genuinely good. Brainback is the practice and recall layer around it.
Every comparison matters to some students more than others. Here’s where the switch from Khan Academy pays back fastest.
AP prep on a budget: Khan for exposition, Brainback for practice, both free.
The Khan + Brainback combo covers content and practice, no textbooks needed.
For anyone learning from Khan's library, Brainback is the accountability layer around it.
Career-pivot into a technical field? Khan for exposure to fundamentals, Brainback to actually retain them.
Use both. Watch the Khan video for the concept, then use Brainback to practice with real problems, spaced recall, and explain-back scoring. This is the workflow we recommend for high school and early undergraduate students on a budget.
Khan's exercises are excellent for exposure and initial fluency — do the ones in the video's context. But once you're being tested, the SM-2 recall + explain-back rubric is what makes the learning stick. Those are Brainback.
Khan is free, forever, and does not deserve to be canceled. Brainback's free tier is real too. A student on both platforms can go through an entire high-school AP curriculum without paying a cent to anyone.
Khanmigo is an AI tutor from Khan Academy — narrower in scope (it primarily helps within Khan's curriculum), and more permissive about giving direct answers. Brainback is subject-general, curriculum-agnostic, and structurally refuses answers on your declared subjects.
Not directly. Khan progress is per-topic; Brainback tracks per-attempt with spaced recall. You'll build a fresh Brain score baseline over a few weeks.
For content exposure: Khan. For practice + recall + calibration: Brainback. Use both together for the full stack — watch the concept, then attempt it with the gate on and let the misses become cards.
Khan has 'unit mastery' which is a form of retention tracking, but it's coarser than SM-2 and doesn't generate cards from your specific errors. Brainback's card generation is per-mistake and per-explanation.
Not yet — Brainback is designed for ~grade 6 reading level and up. Khan is stronger for K-5. We may add an age-tuned surface later in 2026.
ChatGPT is a brilliant answer machine. Brainback is a tutor that refuses.
Photomath is a scanner. Brainback is a tutor.
Wolfram computes. Brainback teaches.
Chegg sells you answers. Brainback refuses them.
Course Hero is a library of other students' work. Brainback is where you build your own.
Symbolab solves. Brainback teaches you to solve.
→brainback vs khan academy
Free forever. Cancel Khan Academy if the trade works for you.