There is no single "best STEM app," because STEM spans coding, math, science, and engineering, and the right tool depends on your child's age and what you want to build. For free coding, ScratchJr and Scratch are the standard picks. For broad early learning, Khan Academy Kids is free and ad-free. Whatever you choose, judge it on what it teaches and how it treats your child, not on the word "STEM" in the title.
Search "best STEM apps for kids" and you will get a hundred listicles, most of them ranking apps by how much the writer was paid to mention them. This is not that. STEM is broad, your child is specific, and the useful question is not "which app is best" but "best at what, for whom."
First, what makes a STEM app actually good
Before any names, the criteria. A STEM app worth your child's time tends to pass five tests, the same ones we lay out in how to choose a coding app:
- It teaches a real, transferable skill, not one app's tricks.
- Your child is creating, not just consuming. Making beats watching, every time.
- It avoids dark patterns: no ads, no in-app purchases aimed at kids, no streaks or daily-login pressure.
- It respects privacy and is COPPA-compliant.
- It fits your child's age and has a sense of completion, not an endless treadmill.
If an app fails these, no amount of "STEM" branding redeems it. If you want a printable version, we have one in a parent's checklist for evaluating educational software.
The best options, by domain
Coding
For free, open-ended coding, ScratchJr (ages 5 to 7) and Scratch (8 and up), both from the nonprofit Scratch Foundation, are the benchmarks. For a guided, structured path, there are good subscription options. We compare the coding field in detail, with scoring, in the best coding apps for kids, compared and audit them for manipulative design in the coding apps dark-pattern index.
Math
Early math is less about drilling facts and more about number sense: counting, comparing, patterns, and part-whole thinking. Khan Academy Kids is free, ad-free, and covers early math alongside other subjects. Many other math apps are subscription-based; the same five tests apply. We dig into what actually matters for young learners in early math for young kids.
Science and engineering
For the youngest children, the best "science and engineering apps" are often the ones that push kids back toward building and testing in the real world, rather than tapping through facts. Look for tools that frame a problem, let the child design a solution, and reward iteration. More on that in engineering for kids.
The label "STEM" tells you almost nothing. What the app asks your child to do tells you everything.
The case for one world instead of five
Here is the catch with the by-domain approach: you can end up juggling a coding app, a math app, a science app, and two more, each with its own login, its own subscription, its own quality level, and its own privacy and dark-pattern profile to vet. That is a lot of surface area to manage, and a lot of context-switching for a child.
One connected learning world can solve that, if it is broad and deep enough. One world, one set of values you have checked once, and skills that connect across domains instead of living in separate silos. We make that argument in full in why one connected galaxy beats five separate apps.
That is what we are building with Loopz: coding, math, engineering, and art as connected Stations in one galaxy for ages four to ten, with no ads, no in-app purchases, no streaks, and a real ending. Our honest caveat, the same one we give everywhere: Loopz launches in 2026, so it does not yet have the classroom mileage of the established names above. If you want a proven free tool today, start with ScratchJr or Khan Academy Kids.
Pick the one skill you most want your child to build this month: coding, number sense, or building and tinkering. Just one.
Then choose a single free tool for that skill and give it twenty minutes together. You will learn more about what your child responds to in that one session than from any ranking, and you will have spent nothing.
Common questions
What is the best STEM app for young kids?
There is no single winner, because STEM spans coding, math, science, and engineering. For free coding, ScratchJr (ages 5 to 7) and Scratch (8 and up) are the standard picks. For broad early learning including math, Khan Academy Kids is free and ad-free. The best choice depends on your child's age and which skill you want to build.
Are free STEM apps as good as paid ones?
Often, yes. Some of the best tools for young children are free and excellent. The more useful question is how a free app makes money: if it runs on ads or in-app purchases aimed at children, your child's attention is the product, which deserves more scrutiny than the price.
Is it better to use one STEM app or several?
Several single-subject apps can work, but they mean separate logins, inconsistent quality, and different privacy and dark-pattern profiles to vet. One connected, trustworthy platform that covers several domains is usually calmer for the child and easier for the parent to manage.