Math desk
A working TI-84 emulator — press Y= to enter functions, GRAPH to plot, TRACE to walk the curve. Click the calculator and your keyboard works too.
What the keys do
A real subset of the TI-84 operating system, rebuilt in the browser.
| Key | Behavior |
|---|---|
| Y= | Edit Y1–Y4 · ENTER moves down · CLEAR wipes a line |
| WINDOW | Xmin, Xmax, Xscl, Ymin, Ymax, Yscl |
| ZOOM | Standard, In, Out, ZSquare, ZTrig, ZoomFit |
| TRACE | ◀ ▶ walk the curve · ▲ ▼ switch function |
| 2nd GRAPH | TABLE of values |
| 2nd MODE | QUIT to the home screen |
| 2nd x² | √( · 2nd LOG gives 10^( · 2nd LN gives e^( |
| MODE | Radian / Degree · MATH opens the function menu |
Try these on the home screen
Type one, press ENTER, and it stacks up like the real thing.
2+3*4^2sin(π/6)√(144) log(1000)5!Ans*2 2(3+4)abs(-7)e^(1)
Quadratic solver
ax² + bx + c = 0, with discriminant, vertex, and factored form.
Triangle solver
Fill in any three values — at least one side. Angles in degrees.
Number tools
Prime factorization, GCF and LCM, decimal to fraction.
1-Var statistics
Numbers separated by commas, spaces, or new lines.
English desk
Count it, clean it, cite it. The box below feeds the counter and the formatter, so you only paste once.
Your text
Everything on this desk reads from here. Counts update as you type.
Formatter
Each button rewrites the text above. Undo restores the previous version.
Word use
Repeated words are the fastest thing to fix in a draft.
MLA 9 citation builder
Pick a source type and fill in what you have. Blank fields are skipped.
Science desk
The full periodic table drives the molar mass calculator below it — click any element to see its details.
Periodic table
118 elements, colored by family. Click one.
Molar mass
Type a formula with capital letters and parentheses: Ca(OH)2, H2SO4, CuSO4.
Unit converter
Pick a category, then the two units.
Significant figures & scientific notation
Counts sig figs, rounds to a chosen number, and converts to scientific notation.
Physics formula solver
Leave exactly one box blank and it solves for that variable.
Note boxes
Each box saves itself to this browser as you type. Drag the grip to reorder, and use the search field to filter. Each box has its own download button that saves just that box as a .txt file.
Code runner
Write HTML, CSS, and JavaScript on the left and watch it render on the right. Ctrl+Enter runs it.
Games
NES, Game Boy, Game Boy Color, and SNES. Add your own ROM files — they stay in this browser, in this profile's library, and are never uploaded anywhere.
.nes · .gb · .gbc · .sfc · .smc · .zip