Khan Academy and Prodigy get compared constantly, which is strange once you look closely, because they barely do the same job. Khan Academy teaches: video lessons, worked examples, and mastery practice, all completely free from a nonprofit. Prodigy motivates: a fantasy RPG that gets kids answering math questions voluntarily. Asking which one is "better" is a little like asking whether a textbook is better than recess.
Disclosure up front: we make Infinilearn, a free math RPG for grades 5-9 that overlaps with part of what both of these platforms do, so we have a stake in this conversation. We've tried to keep the comparison honest anyway, including the part where Khan Academy, a tool we don't compete with and can't touch on instruction, belongs in nearly every family's toolkit.
The useful question isn't which platform wins. It's which job is missing for your child: understanding, or practice.
Khan Academy: Built to Teach
Khan Academy is the best free math instruction available, full stop. Every topic from kindergarten arithmetic through calculus has video lessons, worked examples, and practice problems with hints, organized into courses with mastery levels and unit tests. It's a nonprofit, so there is no premium tier, no ads, and no locked content waiting to disappoint anyone. When a 7th grader genuinely does not understand why you "do the same thing to both sides" of an equation, Khan Academy is the free resource that can actually explain it, then let them practice it, then check whether it stuck. The rhythm it supports is simple and effective: watch the short lesson, work the exercise with hints turned on, and let the unit test confirm the concept survived contact with new problems.
Where Khan Academy falls short
It requires self-motivation, and it feels like school, because in the best sense it is school. A student who is willing to sit down and work gets enormous value. A student who avoids math will simply not open it, and when a parent makes them, the sessions have the emotional texture of extra homework. Khan Academy's own mastery system is a quiet progress bar, not a reason to come back tomorrow. For a certain kind of kid that's fine. For the kid who has decided math is the enemy, it's a nonstarter.
Prodigy: Built to Motivate
Prodigy is a free-to-play fantasy RPG for grades 1-8. Kids build a wizard, battle monsters, collect pets, and cast spells by answering math questions matched to their level. It's polished, has native mobile apps, and is popular enough in schools that your child may already have an account. Its real achievement is behavioral: it gets kids who would never voluntarily practice math to answer dozens of questions in a sitting, because the questions are the price of playing.
Where Prodigy falls short
Two places. First, instruction is thin. When a student misses a question, the game largely rolls on; there's no meaningful teaching moment, so a kid who doesn't understand a concept can spend an hour being wrong in an entertaining costume. Second, the membership. The math is free, but the rewards that power the motivation loop, like pets, gear, and member-only areas, sit behind a membership at about $9.95 per month, and free players are shown what they're missing. Add the elementary-leaning tone and content depth, and middle schoolers in particular tend to age out of it.
| Khan Academy | Prodigy | |
|---|---|---|
| Core job | Instruction | Motivation |
| Price | Completely free (nonprofit) | Free to play; membership about $9.95/month |
| Grades | K-12 and beyond | 1-8, elementary-leaning |
| Teaches concepts? | Yes: videos, worked examples, hints | Minimal |
| Kids open it voluntarily? | Rarely | Usually |
| Watch out for | Feels like school; needs self-motivation | Membership pressure; shallow engagement |
Which Job Is Missing for Your Child?
Families who ask "Khan or Prodigy?" are usually really describing one of three kids. Figure out which one lives in your house and the decision mostly makes itself.
The kid who understands but won't practice
They follow along in class, they can do the problems when you sit next to them, but independent practice is a nightly fight and the skills stay wobbly because the reps never happen. The missing job here is motivation, and more Khan Academy just adds more school. This is the kid game-based practice was invented for, and the honest research picture on math games versus worksheets supports using the game format precisely here: its reliable advantage is engagement and time-on-task, which is exactly what this kid lacks.
The kid who practices but doesn't understand
They do the homework, they grind, and the test scores don't move. This is usually procedural knowledge without conceptual understanding. The classic middle school version: a 7th grader who can solve one-step equations (a 6th grade skill) mechanically, but falls apart on two-step equations because the idea of inverse operations never actually landed. The missing job is instruction, and no amount of game time fixes it. This kid needs Khan Academy's videos and worked examples, in small doses, targeted at the current unit.
The kid missing both
Behind on concepts and resistant to practice. Start with instruction in the smallest viable doses, ten minutes of a Khan lesson with a parent nearby, immediately followed by low-stakes practice in a format that doesn't feel like punishment. The pairing matters more for this kid than for anyone else, because instruction without practice evaporates and practice without instruction just rehearses confusion.
A ten-minute kitchen-table diagnosis
If you're not sure which kid you have, you don't need a formal assessment. Pull three problems from this week's homework and try this:
- Have them solve one out loud. A kid who narrates the steps and gets it right, but groans through the entire thing, has a practice problem, not an understanding problem.
- Ask "why does that step work?" A kid who can only answer "because that's the rule" is running on procedure. That holds up until the problems change shape, which in middle school is every few weeks, and it's the signature of a missing instruction layer.
- Swap the numbers and try again. If a familiar problem with new numbers falls apart, the concept never landed. If it goes fine but they flatly refuse a fourth problem, you're back to a motivation gap.
Ten minutes of this tells you more than a quarter of report cards, because a report card averages the two problems together into one unhelpful letter.
Pairing Them: The Two-Layer Stack
Since the platforms do different jobs, the strongest answer for many families is both, in defined roles. A rhythm that works: two short Khan Academy sessions a week aimed at whatever the current classroom unit is, game-based practice on the other days, and one weekly parent check of the dashboards rather than nightly hovering. Total cost: zero, if you hold the line on Prodigy membership. If you're assembling a broader zero-budget toolkit around this stack, our list of free math websites for students covers the supporting options.
The one thing to monitor in the pairing is drift: the game side is pleasant and the instruction side isn't, so left alone, the ratio slides toward all game. Anchoring Khan time to the school unit ("watch the lesson for what you're doing in class this week") keeps it small, relevant, and defensible when your kid asks why. In the weekly check, look at two numbers rather than screen time: mastery progress on the current Khan unit, and accuracy at grade level on the practice side. If the first number moves and the second doesn't, add practice. If it's the reverse, add instruction.
Where a Third Option Fits
There's a gap in the Khan-plus-Prodigy stack, and it's widest in middle school. Prodigy's world and content depth lean elementary, and its motivation loop pushes toward a paid membership. So the practice layer, the layer you chose specifically because your kid would actually use it, weakens right around 6th grade, exactly when the math turns abstract and the stakes rise.
This is the gap we built Infinilearn for, and again, we make it, so read accordingly. It's a fantasy RPG with the practice engagement of a game, but scoped specifically to grades 5-9 math and with nothing gated: the full game, all 15 zones, every quest and boss, and all of the math are free, with no ads. Every attack and spell requires solving a Common Core-matched problem, and the adaptive engine tracks accuracy by topic so weapon attacks pull problems from the student's weakest subjects, which means the reps concentrate on gaps without a parent assigning anything. The free parent dashboard shows accuracy by topic for one child. An optional premium ($9.99 per month or $59.99 per year) adds deeper reporting and cosmetic items only, never math content or progression.
To be equally clear about what Infinilearn is not: it's practice, not lessons. There is no video library, and we tell parents plainly to keep Khan Academy as the instruction layer even if their child practices with us. It's also newer and smaller than either platform in this article, multiple choice only, and browser-based with no native app. If you're weighing it against Prodigy specifically, our Infinilearn vs Prodigy comparison goes feature by feature.
The Bottom Line
Khan Academy and Prodigy aren't rivals; they're answers to different problems. If your child doesn't understand the math, Khan Academy is the best free instruction in existence, and nothing game-shaped substitutes for it. If your child understands but won't practice, Prodigy can reopen the door for elementary kids, with your eyes open about membership pressure, and a grades 5-9 student is likely better served by a practice game built for their level.
Diagnose the missing job first, pick the tool that does that job, and pair rather than replace when both jobs need doing. Every option in that sentence is free, so the only real cost of experimenting is a few weeks of attention.