Isotoon
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An AI study tool that explains the thing you're stuck on

Isotoon is an AI study tool for high school and college students: you type the question you can't get past, and about a minute later you watch a short animated video that explains it, with its sources listed. It is built for understanding an idea, not for summarizing or memorizing.

Ask the question you're stuck on

Two real ones

2D video · 30 seconds

What does a derivative actually tell you?

Starts from a car's speedometer and a graph of distance over time, shows why an average speed misses the detail, then shrinks the gap between two points to zero until the secant line becomes the tangent line, whose slope is the derivative.

Scenes, in order:

  1. Your speedometer is a derivative
  2. Distance over time
  3. Average speed misses details
  4. Shrink the gap to zero
  5. Slope of tangent = derivative
3D model · 12 seconds · no sound

How does DNA copy itself?

A recording of a 3D scene of DNA replication: the double helix, its 5′ and 3′ ends marked, turns as helicase and topoisomerase arrive at the replication fork and the parent strands are pulled apart, then primase lands on each separated strand.

Labeled in the scene:

  • Parent strand
  • Helicase
  • Topoisomerase
  • Primase

How it works

  1. Type the question in your own words. "Why does the chain rule multiply?" works better than pasting a chapter title.
  2. Isotoon writes a short script, checks each factual claim in it, and only then draws and animates it. Narration plays and captions are always on.
  3. Watch it, ask a follow-up underneath if one part still doesn't land, and the follow-up continues the same video as its next part.

That is the whole loop. You never have to set up a deck, paste in a reading or pick a template. The question is the input.

Where it fits next to flashcards and notes apps

Most students already use a few tools, and Isotoon is not trying to replace them. Use Anki for memorizing, Isotoon for understanding.

  • Flashcard apps and spaced-repetition decks are better for memorizing facts: vocabulary, reaction names, dates, formulas you just need to recall.
  • Notes apps and AI summarizers are better for organizing material you already have: lecture notes, readings, outlines.
  • Isotoon is for the moment an idea isn't clicking. You have read the paragraph twice, the formula still looks arbitrary, and you need to see why it works.

A card that says "derivative = slope of the tangent line" is easy to memorize and easy to not understand. A short video on what a derivative tells you shows the secant line sliding into the tangent, so the definition has something behind it. Once it makes sense, a flashcard is a fine way to keep it.

Subjects it covers

You can ask about anything in your coursework. These are the subjects we have written study pages for, each with example questions and concept pages:

Processes that happen in three dimensions, like how DNA copies itself, can also be a 3D model you turn and step through on Pro.

Spaced review, built in

Understanding something once is not the same as still knowing it in three weeks. Your notebook lists each video you made to rewatch 1, 3, 7, 14 and 30 days later. Rewatching a 30-second explanation on day 7 takes less time than relearning the idea from the textbook on day 20.

It is a rewatch list, nothing more: no quizzes and no grades. If you are planning around a test date, exam prep with Isotoon shows how to use the schedule in the last week.

Private by default

Studying means asking questions you might feel you should already know the answer to. So your videos are private to your account. There is no feed, no autoplay, no comments and no messages. There are no ads, and your data is not sold. A video ends when the explanation does, and then you go back to studying.

What it is not

Being clear about the limits saves you time:

  • It does not read your notes, slides or PDFs. It starts from a question you type.
  • It does not do your homework. It explains the idea behind a problem so you can work the problem yourself.
  • It is not a replacement for your class. Your instructor decides what is on the exam and how it is graded.
  • It explains the standard version of an idea. Check anything your class covers differently, using the sources each video lists.

If you are comparing options, our guide to the best AI study tools for college students lays out which kind of tool does what. When you are ready, make a study video from your own question or see plans. Your first video is free.

Questions

Is Isotoon an AI summarizer?
No. A summarizer shortens material you already have. Isotoon starts from a question you type and explains the idea behind it in a short animated video, with its sources listed.
Should I use Isotoon instead of Anki or Quizlet?
Use both for different jobs. Flashcards are better for memorizing facts once you understand them. Isotoon is for the part before that, when an idea is not making sense yet.
Can I give it my lecture slides or class notes?
No. Isotoon does not take files. Type the specific thing you are stuck on, in your own words, and it explains that.
Will it solve my homework problems?
It is not built to hand you answers. It explains the concept a problem depends on, so you can work through the problem yourself and do the next one too.
What does it cost to try?
Your first video is free: you pick one of the example questions and nothing is saved from it. After that, Basic is $20 a month and Pro is $50 a month, and new subscribers get one 7-day free trial.