Intro biology is exactly 535 units of knowledge. Absorb every one

Intro bio textbooks all follow the same committee-set requirements, so they all teach the same knowledge. We distilled that knowledge from multiple open textbooks and curricula, broke it into its smallest meaningful units, and worded each one to be as easy as possible to understand and absorb.

An EKU runs about 17 words.

One EKU at a time, Absorb Biology is like having a professor of your own, a textbook of your own, a tutor of your own, and a record of what you know, all in one.

First you grasp an EKU, then you absorb it: you say it out loud and type it, over six rounds (you can set more or fewer), with less support each round. Whenever you want, say or type any EKU and the app checks whether you have it right.

Want to go deeper? Dive into any EKU’s background, or look up the EKUs it directly relates to.

On your Overview, you always see exactly where you stand: which of the 535 you’ve absorbed, which are in progress, which are still new.

That’s the core truth about the Krebs Cycle. In 14 words. When you open an EKU, its text streams onto the screen, with or without an audio track, as you prefer. Tap the logo to pause or restart it, as often as you like. On your account’s Overview, 165 now shows as in progress.

Want more than those 14 words? Slide to Recap, and the same EKU is spelled out at greater length: where the matrix sits, what the cycle processes, and what it yields with each turn.

From there, Dive In for deeper background, review the EKU’s key concepts in Concepts, or see the other EKUs it references in References.

When you’re ready, slide to Absorb. You say the EKU out loud and type it, round after round, with less of it showing each time, until you can fluently say it on your own. You can run fresh rounds anytime.

Then Verify: say or type the EKU from memory, and the app checks whether you have it right. If you don’t have it yet, absorb it again. When you do, 165 turns to absorbed on your Overview, and Next takes you to 166.

You read the chapter. You read it again. You highlighted it in three colors and rewrote your notes. Then the midterm asked about something you didn’t know you had missed. Then about something else.

That way of studying eats your nights and weekends, and still leaves gaps you can’t see.

With Absorb Biology, one EKU should take two or three minutes. So all of intro bio comes to roughly 18 to 27 hours of learning. Of course, everyone’s pace is different, and different at different times.

Because each EKU is self-contained, you can spread those hours over as many or as few days as you like.

You don’t need to be enrolled in a college course to master intro bio. Absorb Biology works just as well on your own as it does alongside any class.

If you only need what’s on your next exam, focus on those EKUs. If your final is six weeks away, about 25 to 40 minutes a day would cover all 535.

Or search for “meiosis,” say, or anything else on your study guide, and the app brings up every EKU that mentions it, without your needing to know their numbers. Verify the ones you think you know. The rest are tonight’s work.

To get anything useful from a chatbot, you have to already know what you’re looking for. What you’re missing is exactly what you don’t know to ask about.

Absorb Biology works from a model of the knowledge itself: all 535 EKUs that make up intro bio, how each one connects to the others, and which ones you have absorbed, are working on, or haven’t started.

Here, you never have to guess what to ask next. Besides, the goal is absorbing, not chatting.

The patented technology is the work of an inventor who spent a decade working on how to put the whole of an advancing science within reach of anyone who wants to learn.

See the patents →

There are no testimonials on this page. Absorb Biology is new, and you would be among its first users.

We could pay people to try it and quote them. But why ask you to trust paid strangers? Instead, we made 18 EKUs free in the app, with every feature on. Use the app to absorb them and decide for yourself.

Absorb Biology is launching in the United States first. For now, the app and its passes are available only to learners in the US.

There are no refunds, except where the Terms, Apple’s or Google’s refund policies for in-app purchases, or the law where you live provide one.

Prices are in US dollars, plus applicable taxes. The app also offers day and week passes and a monthly subscription; prices may vary by store and region.

Absorb Biology is free to download, with full functionality on 18 EKUs.

The free EKUs come from different parts of intro bio, so if you’re taking a class right now, you may happen upon one from whatever your course covers this week. Perhaps you will close a knowledge gap before you pay anything.

The Fall ’26 Pass opens all 535 EKUs for $129. It’s a launch offer, on sale through the end of December 7, Hawaii time. Whenever you buy it, access ends on December 31. So the sooner you start, the more of it you get. The Fall ’26 Pass doesn’t renew, and it doesn’t carry the mastery guarantee that comes with the 100-Day Guaranteed Mastery Pass.

If you buy your pass here, you’ll also set up your learner’s account by entering a password and the email address you’ll use in the app. Then download the app and log in: your pass is already active.

In our estimate, absorbing all 535 EKUs takes 18 to 27 hours. At 20 minutes a day, that’s about 54 to 80 days, well inside 100. But your pace is your own, and the guarantee is for the case where our estimate turns out wrong for you.

We ask two things in return, and the app measures both.

Within your 100 days, you spend at least 2,000 minutes learning in the app: about 20 minutes a day, spread however you like. Only active learning time counts; an app left open on its own doesn’t.

And you must verify as you go, with no more than five EKUs in progress at a time. If opening a new EKU would make six, the app asks first: verify one of them, or continue without the guarantee. The choice is yours, and either way you keep your full 100 days of access.

If you’ve done both and haven’t verified all 535 by day 100, your access continues, free, until you have. You don’t need to ask; the extension starts on its own.

During the extension, your focus narrows to what’s left. You work on one EKU at a time and verify at least 12 a week, or all you have left if fewer. The extension ends when you’ve verified all 535, or at the end of any week in which you verify fewer than 12.

The app always shows your minutes and how many and which EKUs are verified, in progress, or still new, so you know where you stand.

Your 100 days start the moment you buy the pass, here or in the app.

“Mastery” here means one thing: you have verified every one of the 535 EKUs in the app. The guarantee pays out in access, never in money, and it doesn’t promise a grade. (For full details, see the Terms.)