No marketing fog — a dimension-by-dimension look at teaching, placement, mastery, records, and price, including where IXL is the better pick.
IXL is one of the most widely used practice platforms in American education, and for good reason: its question bank is enormous, its skill coverage is meticulous, and millions of classrooms use it as a supplement. If your kid needs more reps on a skill they've already been taught, IXL delivers reps.
But that's also the honest limit of it. IXL is drill-and-grade: it asks questions and scores answers. It doesn't sit with a confused kid and explain a concept three different ways until it clicks. Kids who already understand the material get faster at drilling; kids who don't just get faster at being wrong — and more frustrated with every SmartScore drop.
Cullinan Academy is built as the other half of that equation: an AI tutor that actually teaches — worked examples, back-and-forth conversation, re-explanations in your kid's own vocabulary — then verifies mastery and schedules review. Here's the full side-by-side, dimension by dimension, so you can decide which one (or which combination) fits your family.
| Dimension | Cullinan Academy | IXL |
|---|---|---|
| Teaching method | An AI tutor that converses: explains the concept first, works examples with your kid, re-explains when they're stuck, and adapts vocabulary mid-lesson. | Practice questions with answer explanations after you miss. Video tutorials exist for some skills, but the core loop is question → score, not instruction. |
| Placement | Adaptive per-subject placement conversation — a kid can land at 5th-grade reading and 2nd-grade math simultaneously, and the system handles both. | Real-Time Diagnostic pinpoints a working grade level per strand — genuinely useful, but it feeds skill recommendations, not a guided daily curriculum. |
| Mastery verification | Anti-cheat verified mastery: calibrated probes plus focused-time tracking, so a green checkmark means the kid actually knows it — not that they guessed well. | SmartScore rises and falls with answers. It's a decent signal but gameable — kids learn to farm easy skills, and there's no verification a human (or sibling) didn't help. |
| Records & compliance | Printable transcripts with GPA, verified mastery records, time-on-task logs, and state homeschool report templates generated automatically. | Analytics and score reports designed for classroom teachers. No transcripts, GPA, or homeschool state-reporting documents. |
| Spaced repetition | Built in. Mastered material comes back on a per-kid review schedule automatically, so it sticks past Friday. | No built-in review scheduling — revisiting old skills is up to the parent to assign. |
| Electives & life skills | Beyond core subjects: cooking, auto mechanics, personal finance, music, art, languages, and more — same tutor, same mastery tracking. | Math, English language arts, science, social studies, and Spanish. Strong core coverage, no life-skills electives. |
| Parent reporting | A nightly AI-written narrative digest: what each kid worked on, where they struggled, what's scheduled next — in plain English, not charts. | Analytics dashboards and weekly email summaries with scores and time spent. Informative, but you do the interpreting. |
| Price | $20 per kid per month, or $200/kid/year. 14-day free trial, no credit card. | Family memberships start around $9.95/mo for one subject and about $19.95/mo for the core-subjects package as of this writing, with add-on fees for additional children — check their current pricing. |
| Offline & printables | Printable worksheets generated from your kid's actual lessons, so table-time practice matches what they're learning on screen. | Primarily an online experience; some skills offer printable worksheets, but it isn't built around offline work. |
| Kid motivation | Avatar unlocks, streaks, and story-based lessons — a 6-year-old's math lesson can be an adventure, not a worksheet with a timer. | Virtual awards and certificates. Fine for prize-motivated kids, but the SmartScore grind wears on perfectionists. |
Who should pick IXL: families who already have a curriculum they love and just want a deep, well-organized bank of extra practice. As a supplement layered on top of real instruction, IXL is genuinely solid — the skill coverage is exhaustive, the diagnostic is useful, and classroom teachers trust it for a reason. If your kid learns concepts easily and mostly needs reps, IXL does that job well and does it cheaply for a single subject.
Who should pick Cullinan Academy: families who need the teaching itself, not just the practice. If you're homeschooling full-time, someone has to explain fractions the third time, notice that your kid is guessing, keep records your state will accept, and bring old material back before it fades. Cullinan does all of that — placement, instruction, verified mastery, spaced review, transcripts, and a nightly plain-English report — for $20/kid/month.
And honestly? Some families run both: Cullinan as the curriculum and tutor, IXL as an occasional extra-reps tool. There's no rule that says you have to pick one. But if you're choosing a single spine for your homeschool, a practice bank isn't a curriculum — and IXL itself doesn't claim to be one.
Most families find it isn't. IXL is practice and assessment — it assumes the teaching happened somewhere else. Using it as your entire curriculum means you become the teacher for every new concept in every subject. It shines as a supplement on top of a curriculum that actually instructs.
A full curriculum. It places each kid per subject, teaches new concepts conversationally, verifies mastery, schedules spaced review, and keeps transcripts and state-ready records. Some families still use it alongside co-ops or hands-on kits — per-subject tracking works either way.
Yes. The adaptive placement conversation figures out where your kid actually is in each subject in the first session, so there's no lost semester. Your IXL history doesn't import, but it doesn't need to — placement is measured fresh, not transferred.
It depends on how many subjects and kids. Cullinan is a flat $20/kid/month covering everything, including electives. IXL's core package runs about $19.95/month as of this writing with per-child add-on fees — comparable money, but for practice rather than a full taught curriculum. Check IXL's current pricing page for exact numbers.
IXL's static question bank is enormous and we won't pretend otherwise. Cullinan generates practice from your kid's actual lesson context instead of pulling from a fixed bank, and its drills (math facts, sight words, spelling) are infinite by design. Different approach: targeted and taught, rather than exhaustive and self-serve.
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 IXL. 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.