Everything it does.
Photographs of theoremEd running, not mock-ups.
It reads the question off your screen
Press one button and theoremEd sees the question and your working as they appear on the page — a PDF, a textbook site, Google Classroom, DeltaMath. It states what it can see before it says anything else, so you know it is reading the right problem.
Then it finds the first place your reasoning breaks and works from there. Later mistakes are usually consequences of that one, so it leaves them alone until it is fixed.
Ask it outright. It still declines
Not when you insist, not when you are out of time, not when you say your teacher allows it. There is no phrasing that works and no setting that turns it off.
It will tell you whether an answer you worked out yourself is right or wrong. Checking your work is not the same as doing it.
Four levels, and no fifth
The first asks what you notice. The second narrows it to the single idea you are missing. The third names the rule. The fourth sets the step up completely and stops immediately before taking it.
By the fourth you know exactly what to do. Doing it is still yours.
A graphing calculator, built in
Type an equation and it draws. Drag to move around it, scroll or pinch to zoom, hover a curve to read a point off it exactly.
Functions and vertical lines. Circles, ellipses and anything with x and y on both sides. Inequalities, with the region shaded and the boundary dashed where it is strict. Polar and parametric.
61 topics, for the things nobody taught you
Fractions through integrals, written to be read while you are stuck rather than revised from. Alongside them are pages for the situations that have no textbook chapter: you do not know where to start, you followed it in class and not at home, your answer disagrees with the book.
theoremEd will not pretend you were taught something you were not. It sends you to the page, then asks you to apply it.
Tested on what you actually did
theoremEd keeps a record of the problems you worked through and where you needed help, then builds a quiz from it — your unit, your weak points. You choose the topic; it never chooses for you.
It marks each answer as you go, names the step that went wrong without correcting it, and finishes with a straight verdict on whether you are ready for the test.
And the rest of it
Real notation
189 symbols across six keypads, so a question can be typed the way it is written.
Starts from the beginning
It assumes nothing, and steps up the moment you show it you already know something.
Careful language
No "just", no "simply", no "as you know" — the words that make a stuck student stop asking.
Pre-algebra to calculus
Mathematics only. Asked about anything else, it says so and returns to the problem.
Mac and Chrome
The Mac app reads any window. The extension runs on a school Chromebook.
No account
It never asks for a name, an email address or an age.
That is all of it.
No advertising, nothing to upgrade to inside it, and no button anywhere that hands over an answer.
Get theoremEd