Desmos vs TI-84
The free web app vs the classroom classic. An honest comparison.
Desmos is gorgeous and free. The TI-84 is clunky and costs real money. So why does every classroom still use the TI-84? One rule explains almost everything.
Side-by-side comparison
| Feature | Desmos | TI-84 Plus CE |
|---|---|---|
| Price | Free | Around $100+ to buy |
| Graphing quality | Excellent — smooth, fast, beautiful | Good — does the job |
| Ease of use | Very easy, modern interface | Learning curve, button menus |
| Works on phone/browser | Yes, built for the web | Via emulators like ours |
| Statistics & matrices | Basic | Full-featured, exam-style |
| Programming | Limited | TI-BASIC + Python (Python edition) |
| Allowed on SAT/ACT/AP | Usually NO on test day | YES — approved |
| Allowed in most classrooms | Varies by teacher | The standard |
Where Desmos wins
Let us be fair: Desmos is a joy to use. You type an equation and the graph appears instantly, smooth as silk. Sliders let you play with parameters and watch the graph morph in real time. For exploring math at home, it is genuinely better than any handheld.
It is also free and runs anywhere with a browser. No $100+ purchase, no batteries, no hunting for a lost calculator the night before a test.
Where the TI-84 wins — the exam rule
Here is the deciding factor: you cannot bring Desmos to the SAT, ACT, or AP exams. Those tests ban internet-connected devices. The TI-84 Plus CE is on the approved list for all of them.
That single rule shapes everything. Teachers teach TI-84 keystrokes because that is what students will have on test day. Classrooms standardize on it. Practice problems assume it. The ecosystem follows the exam policy.
The TI-84 also goes deeper in a few areas that matter for class: full statistics suites, matrix operations, and distribution functions, all in the exact format your textbook expects.
The smart play: use both
This does not have to be either-or. Use Desmos at home when you want to explore — its sliders are unbeatable for building intuition about how functions behave.
Then learn the TI-84 workflow for class and exams. Practice the Y=, GRAPH, WINDOW, TRACE sequence until it is muscle memory. Our free graphing calculator and the step-by-step graphing guide are built exactly for that practice — no purchase needed.
Frequently asked questions
Last updated: September 26, 2026