The best app to learn science, for the why behind things

By the edgi team Facts checked October 19, 2026

The best app to learn science is edgi, a free iPhone app with more than 15,000 science Lessons of about 60 seconds each. Every Lesson answers one question, like why a siren's pitch drops as it passes or how the Sun manages to burn at all, and every answer becomes a card on a Map of what you know. If you want math and coding drills, that's Brilliant; if a class is assigning chapters, that's Khan Academy.

We make edgi, and we built it to be the most fun way to learn science, starting from the questions you already have.

Competitor facts were checked on October 19, 2026, on the US App Store and each app's own site, plus Brilliant's FAQ and course list. The edgi count is ideas on its Map tagged with a natural science (physics through neuroscience) that have a Lesson.

Why edgi is the best way to learn science

Nobody wakes up wanting to study thermodynamics. People want to know why a room gets messy on its own and never tidies itself, or why chili burns your mouth while the birds that spread the peppers can't feel it. edgi starts there. Each question is a Lesson of about a minute, and it closes by asking you to use the answer.

There's a lot to ask. Of the 29,000 ideas on edgi's Map tagged with a science, more than 15,000 have a Lesson: about 7,300 in biology and 4,200 in physics, then 2,700 in chemistry and 1,800 in astronomy. The longer interactive Lessons, the few-minute kind, lean the same way. 161 of edgi's 318 are science, from the double-slit experiment to quantum tunneling, which turns out to be how the Sun burns.

The messy room is entropy, and it plays on this page:

Entropy Entropy is a measure of how widely energy in a system spreads out and becomes unavailable to do useful work.

60-second Lesson

Entropy

There are vastly more ways for things to be mixed than sorted, so left alone they mix and never sort themselves. That count of ways is entropy.

Play it here Read about entropy

Finish it and entropy is your card, lit up on your Map beside the arrow of time and the heat death of the universe. Next door is Maxwell's demon, an imaginary doorkeeper who sorts fast molecules from slow ones. Each of those is another Lesson and another card. A streak counts your days, and a feed of short videos from educational creators fills the gaps between Lessons.

Then the Map takes you out of the lab. Entropy is one step from information theory, the math of how much a message says, and one step from refrigeration. Across the whole Map, 36% of connections cross from one field into another, so a physics question doesn't have to stay in physics.

Other science apps, and what they teach

Brilliant teaches through interactive courses. Its App Store listing now opens "Brilliant is a superintelligent tutor for math and coding," and its llms.txt file says its "deepest subject areas are math and coding." Of the 69 courses in its sitemap, the science ones are about circuits and quantum computing, plus science puzzles. The free plan gives you two keys a day, each opening one lesson or practice set. On October 19, its pricing page listed Premium at $30 a month, billed as one payment for the year, and the iPhone app listed Premium plans from $19.99 to $191.99. More in edgi vs Brilliant.

Khan Academy is a free nonprofit whose science courses follow school subjects, with videos and exercises for each. It's built for the student with a test coming.

By our count, Kinnu's public site has 14 natural-science pathways with 131 lessons between them. They run from the Periodic Table to Dinosaurs. Every lesson is a written chapter, and the app is free to download.

Pick something else only if…

• You want math or coding practice: Brilliant.
• You're studying for a science class: Khan Academy.
• You want a long written course on one science: Kinnu.
• You need an Android app. edgi's Lessons play in a browser at edgi.tv/learn.

FAQ

What is the best app to learn science? edgi, with more than 15,000 free science Lessons of about 60 seconds each, from entropy to quantum tunneling. Each one becomes a card on a Map of what you know.

Is Brilliant good for science? Brilliant describes itself as a tutor for math and coding, and that's where its deepest courses are. For the natural sciences in short pieces, edgi has more than 15,000 Lessons, free.

What's a good science app for adults? Many science app lists are written for kids or for students with a syllabus. edgi is for the adult who wants to know why things happen: a question per Lesson, about a minute each, free.

Is edgi free? Yes. Lessons, cards and the Map are free, and Sets unlock with coins you earn by learning, not money. An optional Pro subscription adds extras like offline access.