Khan Academy

Review by eFreeware

If you are a student trying to keep up with a math class, an adult who wants to revisit a subject that never quite clicked, or a teacher looking for material to assign, Khan Academy is the app that most obviously fits that need. It is a free Android app from the nonprofit of the same name, and its promise is broad: a personalized learning library covering thousands of subjects, from arithmetic to art history, with no cost attached.

The core of the app is a mix of videos, articles and interactive exercises. You can work through a topic in order or jump straight to whatever you are curious about, and the app tracks what you have practiced so you always know where you left off. With over 10 million installs and a 4.1 average from more than 173,000 ratings, it has clearly found an audience, and the fact that it has been updated as recently as August 2026 suggests the developer is still tending to it.

What sets it apart from a plain video library is the practice layer. Exercises, quizzes and tests give instant feedback and step-by-step hints, so you are not just watching someone explain a concept — you are answering questions about it and getting corrected when you go wrong. For anyone who learns better by doing than by watching, that combination is the main reason to install it.

What you can actually study

The subject range is genuinely wide. Math goes from arithmetic and pre-algebra through algebra, geometry, trigonometry and statistics, then on to calculus, differential equations and linear algebra. Science covers biology, chemistry and physics. The economics section covers micro and macro, plus finance and capital markets. Humanities takes in art history, civics, US history, US government and politics, and world history. There is also computer science principles, and grammar sits alongside the rest.

That breadth means the app can serve very different purposes. A high schooler can use it to get ahead on next semester's geometry. A college student can brush up on statistics over an afternoon. Someone preparing for an exam can work through practice questions in the areas they are weakest. And a curious adult can spend a weekend on something as specific as how fire-stick farming changes the landscape of Australia — the kind of topic that rarely gets this kind of treatment elsewhere.

The structure is built around mastery rather than completion. The developer describes a system that adapts to your current learning level and recommends exactly which skills and videos to try next, based on instant feedback from your answers. If you create a free account, your progress syncs with khanacademy.org, so you can move between the app and the website without losing your place. That is a small detail that matters a lot if you study in more than one setting.

Practice, feedback and offline use

The practice exercises are the part I would expect to get the most use. Each one gives instant feedback and, when you get something wrong, step-by-step hints that walk you through the reasoning rather than just marking it incorrect. Quizzes and tests let you check whether a topic has actually stuck, and the mastery system uses those results to decide what to put in front of you next. It is a loop that rewards regular short sessions more than one long cram.

Offline use is handled through bookmarking and downloading. You can save your favorite content and watch videos without an internet connection, which is useful if you study on a plane, in a waiting room with poor signal, or anywhere else where streaming is not practical.

The app is free, with no ads and no in-app purchases. Khan Academy is a 501(c)(3) nonprofit with a stated mission of providing a free education to anyone, anywhere, and the Android app reflects that: there is no paywall between you and the exercises, and no upsell interrupting a lesson. For a subject library this size, that is unusual and worth noting.

Setting up and signing in

Getting started is straightforward. An account is not required, but signing in keeps your progress in step with khanacademy.org on every device.

One thing to understand before you install is that the Android app is not the full Khan Academy experience. The developer points out that discussions, programming lessons, exam practice and the tools aimed at parents, teachers and schools live on the website, not in the app. If your interest is in one of those areas specifically, the app alone will not cover it, and you will want to use the web version alongside it.

The most recent update is a set of bug fixes and performance improvements, which suggests the app is being maintained rather than left static.

Who gets the most from it

Students are the most obvious fit. The app follows what you are learning in school, so you can practice alongside your coursework, get a head start on a subject coming up next term, or go back over material you did not fully absorb the first time. The instant feedback and hints make it feel more like a tutor than a textbook, and the mastery recommendations take some of the guesswork out of what to study next.

Teachers and homeschoolers are the second group. The developer lists teachers, homeschoolers and principals among the people the library is for, and the range of subjects makes it easy to find material that matches a lesson plan. Adults returning to education after a long break are also well served, because the mastery system starts from your current level rather than assuming prior knowledge.

The app is also a reasonable choice for anyone who simply likes learning. If you have ever wanted to understand how the Krebs cycle works, or what macroeconomics is actually about, or how the US government is structured, this gives you a structured path into those subjects without a fee or a subscription.

A free library with real depth

What I like most about Khan Academy on Android is that it does not feel like a companion app bolted onto a website. For a free app with no ads, the depth of the subject catalog is the main draw.

The trade-offs are mostly about scope rather than quality. The app does not include the community discussions, programming content, test prep, or the parent, teacher and district tools that the website offers, so if any of those are your reason for coming, you will need the web version.

None of that undermines the core offer. This is a well-established app — released in September 2015 and still being updated — with a large install base and a solid rating, and it does what it says: it gives you a free, structured way to learn a wide range of subjects on your phone.

The case for installing it

I would recommend Khan Academy to anyone who wants to study a subject seriously without paying for it. The combination of videos, articles and interactive practice with hints and instant feedback is more complete than most free learning apps, and the mastery system gives you a clear sense of what to do next rather than leaving you to browse aimlessly.

It suits students at almost any level, from arithmetic through calculus, as well as adults returning to study and teachers looking for material. For everyone else, this is a free app with no ads and no purchases that earns a place on your phone.

The bottom line is that Khan Academy is one of the few genuinely free educational apps with this much content, and the Android version covers the essentials well. If you have been meaning to brush up on a subject or get ahead on one, this is a sensible place to start.

What's new in version 8.5.1

∙ Bug fixes and performance improvements.