# OpenClassroomTool.com

> Free classroom tools for teachers: timers, 3D dice, spin wheel, name picker, noise meter, whiteboard, 3D shapes and a Classroom Board. No sign-up, no ads.

Key facts:
- Cost: free; no account; no ads; no cookies or third-party scripts.
- Audience: teachers presenting on a projector, TV or interactive whiteboard.
- Keyboard: Space = main action (start, roll, flip, spin, pick), R = reset, F = present full screen, ? = shortcuts.
- Privacy: class lists, scores and boards are stored only in the browser (localStorage); the noise meter measures loudness locally and never records.
- Randomness: every random result comes from crypto.getRandomValues with rejection sampling; 3D animations display the result, they do not decide it.
- Classroom Board (https://openclassroomtool.com/board): place several tools as resizable widgets on one screen; saved in the browser, with templates.

## Classroom Timers & Clocks

- [Classroom Timer](https://openclassroomtool.com/timer): Free classroom countdown timer for the projector: big digits, ring, pie or bar display, color warnings, alarm sounds and one-key presets. No sign-up.
- [Classroom Stopwatch](https://openclassroomtool.com/stopwatch): Free online stopwatch for the classroom: huge digits to the hundredth, lap times with fastest and slowest marked, a sweep dial and laps you can copy.
- [3D Sand Timer](https://openclassroomtool.com/sand-timer): A realistic 3D hourglass for the classroom: flip it and watch the sand run for 30 seconds to 15 minutes, pick the sand color, and hear a soft chime at the end.
- [Classroom Clock](https://openclassroomtool.com/clock): A big analog classroom clock with digital time and time in words. Drag the hands to teach telling time, or quiz the class with a random time.
- [Lesson Agenda Timer](https://openclassroomtool.com/agenda): Put your lesson plan on the board as timed blocks: see what’s now and what’s next, minutes left, clock times, and a chime as each part ends.

## Randomizers & Classroom Games

- [3D Dice Roller](https://openclassroomtool.com/dice): Free 3D dice roller for teachers: roll 1 to 12 realistic dice with real physics, dots or numbers, D4 to D20, and a big total for the class to see.
- [3D Coin Flip](https://openclassroomtool.com/coin-flip): Free 3D coin flip for teachers: toss up to five realistic gold, silver or copper coins, rename the sides and keep a live heads-and-tails tally.
- [Spin the Wheel](https://openclassroomtool.com/spin-wheel): Free spinning wheel for the classroom: load a class list or type your own entries, spin a 3D prize wheel and remove winners so everyone gets a turn.
- [Random Name Picker](https://openclassroomtool.com/name-picker): Free random name picker for the classroom: a card flips or a slot reel spins to reveal a student. No repeats until everyone has had a turn. No sign-up.
- [Random Group Maker](https://openclassroomtool.com/group-maker): Free random group generator for teachers: split your class into balanced groups by number or size, skip absent students, star a leader and print or copy.
- [Random Number Generator](https://openclassroomtool.com/random-number): Free random number generator for teachers: any range, up to 20 numbers at once, no repeats like a bingo caller, and big rolling digits for the projector.
- [Classroom Scoreboard](https://openclassroomtool.com/scoreboard): Free classroom scoreboard for 2 to 8 teams: big colored panels, one-key scoring, a crown for the leader and a winner’s podium with confetti. No sign-up.

## Classroom Management Tools

- [Classroom Noise Meter](https://openclassroomtool.com/noise-meter): Free classroom noise meter: a live gauge, bar, bubbles or face that reacts to the room’s volume, with a noise limit, quiet streaks and a gentle alert.
- [Classroom Traffic Light](https://openclassroomtool.com/traffic-light): Free classroom traffic light: a realistic red, yellow and green signal with your own labels, one-key changes and an optional auto timer. Made for projectors.
- [Voice Level Chart](https://openclassroomtool.com/voice-levels): Free voice level chart for the classroom: show silent, whisper, partner, group or presenter voice with a big picture, plus how pupils should work today.
- [Classroom Instructions Board](https://openclassroomtool.com/instructions): Free instructions board for the classroom: big, numbered steps that pupils can follow and tick off, quick routines, a “Next” box and text that always fits.
- [Seating Chart Maker](https://openclassroomtool.com/seating-chart): Make a classroom seating plan in minutes: rows, pairs, groups or a U-shape, drag desks into place, shuffle or sort seats, then print it. Free, no sign-up.
- [Class Points](https://openclassroomtool.com/class-points): Give students points with one click: a cute monster avatar for every name, a class goal with confetti, and sorting by name or score. Free, no accounts.
- [QR Code Maker](https://openclassroomtool.com/qr-code): Make a big QR code for any link and put it on the projector so the whole class can scan it. Add a caption, pick colors, download a PNG or copy the image.

## Interactive Teaching Aids

- [Online Whiteboard](https://openclassroomtool.com/whiteboard): A free online whiteboard for the classroom: smooth pen, highlighter, shapes and text on grid, dot, lined or handwriting paper, or a chalkboard. No sign-up.
- [3D Shapes](https://openclassroomtool.com/3d-shapes): Free interactive 3D shapes for the classroom: turn 12 solids, count faces, edges and vertices, check Euler’s formula and unfold each one into its net.
- [Base-Ten Blocks](https://openclassroomtool.com/base-ten-blocks): Free virtual base-ten blocks: show any number to 9,999 as cubes, flats, rods and units, then break and trade blocks to teach regrouping and borrowing.
- [Fraction Tools](https://openclassroomtool.com/fractions): Free fraction manipulatives for the projector: a fraction wall, fraction circles, a side-by-side comparison and an equivalent fractions finder. No sign-up.
- [Interactive Number Line](https://openclassroomtool.com/number-line): A free interactive number line for the classroom: 0–10, 0–100, negatives, decimals and fractions. Show hops with their equation, drop markers, zoom in.
- [3D Globe](https://openclassroomtool.com/globe): Free 3D globe for teachers: spin a NASA Blue Marble Earth, show the equator, tropics, polar circles and a latitude grid, and label continents and oceans.

## About

- [About](https://openclassroomtool.com/about): principles and how the 3D tools work.
- [Privacy](https://openclassroomtool.com/privacy): no data collected; everything stays in the browser.
- Contact: hello@openclassroomtool.com