About

A calculator that explains itself

Most graphing calculators give you a number or a curve and leave. That is fine if you already understand the method and just want a quick check. It is unhelpful if you are trying to learn why the answer is what it is.

This site exists to close that gap. The step solver attaches the working to the answer — the discriminant you computed, the Cramer's-rule determinants you evaluated, the derivative rule you applied. The graph is the same, but the reasoning is visible.

What you get

A full graphing calculator — functions, polar and parametric curves — a TI-84 Plus™ style keypad, a table of values, and a step solver for quadratics, linear equations, systems and derivatives. Five tools sharing one engine.

Every one of them is free. There is no premium tier, no trial that expires, and no feature held back for an account you have not created.

What you do not get

No account, no download, no cookies, no analytics script, no ad network. The pages contain no third-party tracking of any kind. What you type into the calculator never leaves your browser — the arithmetic happens locally, on your device.

That is not a marketing position. It is the architecture: there is no server component for the calculator, because there does not need to be one.

Why it runs entirely in your browser

There is no server component for the calculator. Once the page has loaded, the arithmetic and the plotting all happen locally on your device, so what you type is never sent anywhere. That also means it runs on a locked-down school device where installs and downloads are blocked.

How it is funded

Through attribution links when other sites embed the calculator, and that is essentially it. The embed keeps the tool free for you and free for everyone else. If you run a school or a course and want a licence without the attribution, get in touch.

Independence and trademarks

This is an independent, third-party tool. It is not affiliated with, sponsored by, or endorsed by Texas Instruments. TI-84 Plus™ is a trademark of Texas Instruments Incorporated and is used here only to describe the keypad layout being emulated, because that is the layout students are taught on and the one their muscle memory expects.

No claim on this site should be read as exam approval. Only Texas Instruments' own hardware appears on official permitted-device lists. The error code guide and the tutorials are independent study aids.

Corrections

If you find a mistake in a worked solution or a tutorial, it is worth reporting — the step solver is tested against a regression suite, but math has a long tail. Use the contact page.