Khan Academy’s real hook is not the video library, it is the practice set: a problem shows up, you answer, it tells you right away, and the next one adjusts to how you did. No login screen between you and the first question. So we built SumStreak, a free arithmetic and pre-algebra drill that runs right here, in your browser, with that same instant loop and nothing else in the way.
Practice with SumStreak now
A problem is already waiting below. Type your answer and press Enter.
How to use it
Practice mode mixes addition, subtraction, multiplication, division and simple fractions. Type a whole number or a fraction like 3/4, then press Enter (or tap Check). Get three right in a row and the difficulty steps up; miss one and it eases back down a notch rather than dropping you all the way to the start. Your streak, best streak and a mastery bar all update live and save on your device automatically.
Daily challenge is a fixed set of 10 problems that ramps in difficulty from easy to hard. Everyone who opens it on the same day gets the identical set, so it works as a shared warm-up: solve it, see your score out of 10, and come back tomorrow for a new one. Your best score for the day is saved locally.
Tap the speaker icon for a soft confirmation tone on each answer, muted by default. Everything runs offline once the page has loaded, and nothing you type is sent anywhere.
How it compares to Khan Academy
We will be upfront about this: SumStreak is not Khan Academy, it is one slice of it. Khan Academy covers full courses from arithmetic through calculus, statistics, and beyond, with video lessons, unit tests, progress tracking tied to an account, and a mastery system that maps your skills across an entire curriculum. It also has a genuinely useful teacher and parent dashboard, none of which we have tried to rebuild.
What SumStreak keeps is the narrow slice that makes the practice sets addictive in the first place: no menu between you and a problem, instant right-or-wrong feedback, a visible streak, and difficulty that adapts to how you are doing right now. There is no account, no video content, and no coverage beyond basic arithmetic and simple fractions. Think of it as a warm-up drill you can open in ten seconds, not a course.
If you need structured lessons, progress tracking across school subjects, or a curriculum built around your grade level, the real app below is the better fit. If you just want to knock the rust off your mental math before a test, SumStreak is already loaded.
Get the full Khan Academy app
Khan Academy remains free for learners of every age, covering math, science, reading, and test prep with full video lessons and progress tracking, funded as a non-profit rather than through a paywall.
Frequently asked questions
Can I practice Khan Academy-style math in a browser?
Yes. SumStreak runs entirely in your browser and covers addition, subtraction, multiplication, division, and simple fractions, with feedback and a difficulty ramp inspired by Khan Academy’s practice sets. It is not a lesson platform, so there are no videos or full courses.
Is this the real Khan Academy?
No. SumStreak is an original practice tool we built, inspired by the instant-feedback loop that makes Khan Academy’s exercises effective. It is not affiliated with, endorsed by, or connected to Khan Academy in any way. For full courses, video lessons, and progress tracking, download the official app from the link above.
Is SumStreak free?
Yes, completely. There is no account, no subscription, and no limit on how many problems you can practice.
Does it work offline?
Yes. Once the page has loaded, practice mode and the daily challenge both work without an internet connection, since nothing is sent to a server.
Where are my streak and scores saved?
In your browser’s local storage, on your device only. We cannot see them, and they do not sync between devices. Clearing your browser data resets your streak and daily best.
