Free • No accounts • Works in your browser

Free Online Timers & Classroom Tools

MinuteBell is a fast, readable toolkit: countdown timer, loop/interval timer, stopwatch, mic test, metronome, noise meter, and a random name picker wheel. No accounts. Works in your browser.

Tools

Countdown Timer

Open

Readable full-screen timer with sound. Pretty URLs like /5-minute and /30-second.

Try /10-minute

Loop / Interval Timer

Open

Work/Rest, rounds, and start delay. Great for Tabata, EMOM, and Pomodoro.

Presets & keyboard controls

Stopwatch

Open

Big digits, start/pause/reset, optional laps, full-screen.

Tab-safe timing

Mic Test

Open

Check your microphone, see levels, and playback a short test clip.

No uploads - browser-only

Metronome

Open

30–240 BPM with accent on 1, time signatures, tap-tempo, and full-screen.

Try /metronome/120-bpm

Noise Meter

Open

Traffic-light display from your mic: Green / Yellow / Red with optional chime.

Approximate loudness (not dB)

Random Name Picker / Wheel

Open

Paste a list and pick without repeats; enable a colorful spin wheel.

Share lists via URL

Dice Roller

Open

Roll different types of dice, per-die results, sum, advantage/disadvantage, and roll history.

Share dice presets via URL

Coin Flip

Open

Flip a coin. Shows history of last 100 flips.

Uses cryptographic randomness

Random Number Generator

Open

Generate a Random Number between low and high numbers of your choice.

Numbers are drawn with cryptographic randomness

Random Letter Generator

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Get Random Letters from a set of your choice. Ex: A-Z, AEIOU, BCDFGHJKLMNPQRSTVWXYZ

Letters are drawn with cryptographic randomness

Group Maker (Teams)

Open

Paste names and instantly create balanced teams. Choose team size or number of teams.

Mark pairs to keep apart and avoid repeating pairings across reshuffles

Seating Chart (Grid)

Open

Build a classroom seating chart. Paste names, randomize, drag-and-drop, export PNG or CSV.

Mark pairs to keep apart

Sequence Timer (Stations)

Open

Build chained timers for classroom stations.

Set loops, play a bell between steps

Traffic Light / Attention Signal

Open

Big classroom traffic light: Red · Yellow · Green

Red: Stop / Eyes on me, Yellow: Get ready / Quiet, Green: Go / Work time

Reaction Time Test

Open

Test your reaction speed. Wait for green, then click or press space.

See your best, average, and standard deviation

Bingo Caller

Open

Call random Bingo numbers (1–75) with no repeats.

Big call view, board highlight, adjustable speed, and call history

Bingo Caller for Sight Words

Open

Speak or draw random words from your own list with no repeats.

Upload or paste a sight-word list, control speed, and track call history

Bingo Card Maker

Open

Create dozens of Bingo cards in seconds.

Export everything as PNG or a single PDF or ZIP bundle.

Bingo Card Maker (Words)

Open

Turn any word list into printable Bingo cards. Perfect for reading centers and vocabulary review.

Paste your list, generate unique cards, and export everything to PNG, PDF or ZIP in seconds.

Why MinuteBell?

Clarity and reliability. Every tool is designed for projectors, screen shares, and quick classroom use, big typography, high contrast, and keyboard shortcuts. Timers use wall-clock scheduling so they keep accurate time even when you switch tabs.
Privacy-minded. Tools like the mic test and noise meter process audio in your browser. Lists in the name picker are stored locally via localStorage nothing is uploaded.
Free and supported by light ads. We reserve fixed spaces for ads to avoid layout shifts. If you’re planning a special lab day and need a no-ads build, reach out on the Contact page.

Who uses these tools?

Teachers running stations, quizzes, or presentations.
Coaches & PE using loop/interval timers for drills.
Music classes practicing with the metronome.
Clubs & meetups picking volunteers with the name wheel.

FAQ

Do I need an account? No. Everything works in the browser.
Will timers keep going if I switch tabs? Yes. The timing scheduler is resilient to tab changes.
Can I share specific setups? Yes. Use pretty URLs for timers (like /10-minute) and tempo slugs for the metronome (like /metronome/120-bpm). The name picker can generate a share link with your list.