No marketing fog — a dimension-by-dimension look at teaching, placement, mastery, records, and price, including where Khan Academy is the better pick.
Let's start with the truth most comparison pages bury: Khan Academy is one of the best things on the internet. It's a nonprofit, it's completely free, its video library is vast and carefully made, and Sal Khan has probably taught more math to more humans than anyone in history. If a comparison page tells you Khan Academy is bad, close the tab.
The real question for a homeschool family isn't 'is Khan good?' — it's 'is Khan a homeschool system?' And Khan Academy itself is honest about this: it's a learning resource, not a guided K-12 curriculum with placement, verified records, transcripts, or state compliance paperwork. Every kid watches the same videos at the same explanations, the parent does the orchestration, and 'course mastery' percentages aren't documentation your state will recognize.
Cullinan Academy costs money ($20/kid/month) precisely because it does the parts Khan doesn't: adaptive per-subject placement, a tutor that converses and re-explains, anti-cheat mastery verification, spaced review, electives and life skills, nightly parent digests, and transcripts with GPA. Here's the fair side-by-side.
| Dimension | Cullinan Academy | Khan Academy |
|---|---|---|
| Teaching method | A conversational AI tutor — teaches, asks, listens, and re-explains based on what your kid actually says, in their vocabulary. | World-class video lessons plus practice exercises and articles. Superbly made, but one-pace and one-directional — every kid gets the same explanation. |
| Placement | Adaptive per-subject placement conversation — measures where the kid really is in each subject and starts there. | Course challenges let motivated students test out of units, but choosing courses and levels is on the parent or student — there's no cross-subject placement system. |
| Mastery verification | Anti-cheat verified mastery with calibrated probes and focused-time tracking — the record reflects demonstrated understanding. | Mastery points from exercises and unit tests. A good self-study signal, but hints, retries, and a helpful older sibling can inflate it, and it isn't verification. |
| Records & compliance | Transcripts with GPA, verified mastery records, attendance/time logs, and state homeschool report templates — generated automatically. | Progress percentages and a parent dashboard. No transcripts, GPA, or state homeschool documentation — record-keeping is entirely on you. |
| Spaced repetition | Built-in review scheduling brings mastered material back automatically before it fades. | Courses include review in unit tests, but there's no ongoing spaced-repetition scheduler across a kid's history. |
| Electives & life skills | Cooking, auto mechanics, personal finance, music, art, and languages with the same tutor and tracking. | Strong academics plus genuinely good extras (financial literacy, computing, arts & humanities). Life-skills coverage like cooking or auto mechanics isn't the mission. |
| Parent reporting | Nightly AI-written narrative digests per kid — what they did, where they struggled, what's next — no dashboard archaeology required. | A parent dashboard with progress and activity data. Serviceable, but built for oversight of self-driven study, not daily homeschool management. |
| Price | $20 per kid per month, or $200/kid/year. 14-day free trial, no credit card. | Free. Genuinely, completely free — it's a nonprofit funded by donations. This is real and it matters. |
| Offline & printables | Printable worksheets generated from your kid's actual lessons for screen-free practice. | Built for online use; videos are downloadable in the app, but there's no printable-worksheet system. |
| Kid motivation | Avatar unlocks, streaks, and story-based lessons — the lesson itself is the hook, which matters for kids who won't self-start. | Energy points, badges, and avatars. Enough for self-driven kids; famously not enough for kids who need the material itself to pull them in. |
Who should pick Khan Academy: self-driven students — especially middle and high schoolers — who will sit down and work without being orchestrated, in families where the parent is willing to be the registrar, placement officer, and record-keeper. For that family, Khan is not just adequate, it's exceptional, and the price of free changes the math entirely. It's also the obvious supplement for any family, including ours: a second explanation of a hard concept from a Khan video costs nothing and often helps.
Who should pick Cullinan Academy: families who need the system, not just the content. If your kid won't self-start, if your kids are at different levels in different subjects, if your state wants documentation, if you want to know each night how it actually went without excavating a dashboard — that orchestration layer is the whole product. Placement, conversational teaching, verified mastery, spaced review, electives, transcripts, and nightly digests are what the $20/kid/month buys.
The honest framing: Khan Academy is a world-class library with exercises. Cullinan Academy is a school that runs itself. Plenty of families use both — Cullinan as the spine, Khan as the free second opinion — and nobody should feel bad about a free nonprofit being on the shortlist.
It can be, for a specific family: a self-motivated student, a parent willing to handle placement, scheduling, records, and state compliance manually, and a state with light reporting requirements. Many families make it work, especially for high school math. Most families with younger kids or multiple kids find the orchestration burden lands entirely on the parent.
The parts that aren't content: adaptive per-subject placement, a tutor that converses and re-explains, anti-cheat verified mastery, automatic spaced review, life-skills electives, nightly narrative parent reports, and transcripts with GPA plus state report templates. Khan gives you a brilliant library; Cullinan runs the school.
Absolutely, and some families do. Cullinan handles placement, daily lessons, mastery records, and reporting; a Khan video makes a great free second explanation when a kid wants one more angle on a tough concept. They're not mutually exclusive.
A full K-12 curriculum — placement through transcripts. Khan Academy describes itself as a learning resource; Cullinan is built to be the complete homeschool system, including the records your state may ask for.
Yes. The adaptive placement conversation measures where your kid actually is in each subject during the first session, so whatever they mastered on Khan carries forward in practice — they place at their real level and keep going from there.
Two weeks, every subject, every kid in the house — free, with no credit card. Start with the placement conversation and see where each of your kids really is.
Not affiliated with Khan Academy. All trademarks belong to their respective owners. Competitor features and prices change; this comparison reflects our honest understanding as of July 2026 — verify current details on their site before deciding.