Everything CountLink does

Sharing

One link, unlimited viewers

Copy the link and send it to as many people as you like. There is no device cap, no seat count and no paid tier, because nothing is held open per viewer.

Join code you can say out loud

Every running countdown also gets a five-character code (countlink.app/j/K3M7Q) for reading to a room or writing on a whiteboard when nobody can copy a URL off a projector.

QR code

Show a QR for the share link so a room can scan it off the screen instead of typing anything. It's drawn in your browser. The link isn't sent to a QR service to make it.

Share sheet on mobile

On a phone the share button opens the native sheet, so the link goes straight into whatever messaging app is already open.

Recent timers

The last few countdowns you started are kept in your own browser, so a link you closed by accident is one click back.

The timer itself

Countdown to a duration

Any length from a second to days, set on the board or typed like a microwave keypad: 700 is seven minutes, 9000 is an hour and a half.

Countdown to a date and time

Point it at an exact instant instead of a length: a launch, a deadline, midnight on New Year's Eve.

Count up: a shared stopwatch

The same one-timestamp mechanic read the other way, so a whole group's stopwatch starts from the same instant.

Laps

Take splits on a count-up without stopping it.

Agenda timer

An ordered list of named segments (intro, demo, break, Q&A) that advances itself on every screen that has the link open.

Interval timer

Work/rest cycles with a round count: Tabata 20/10, boxing rounds, HIIT, or any split you set.

Several timers on one screen

Named countdowns running side by side for cooking, stations, or parallel exam sections.

Sound alerts, free

A choice of end-of-timer tones, on by default. Competitors charge for this; it is the single most common thing a timer needs to do.

Clock correction

Every screen checks its clock against a reference time as the page loads and corrects it, so a projector PC whose clock has drifted by minutes still shows the room the same time left as everyone's phones, and says so under the board.

Spoken countdown

Turn on Voice and the timer says the milestones out loud (ten minutes left, five, one, ten seconds, time's up), for a teacher across the room or a speaker who can't look down. Interval timers call out work and rest.

Wrap-up warning

A countdown visibly changes state as it runs low, so the room gets a warning before zero rather than a surprise at it.

Event labels

Name the countdown ("Break ends", "Quiz round 2") and the label travels with the link.

Control

Phone control

Turn it on before you start and you get a second link that pauses, adds or removes a minute, and stops the countdown live on every screen that has it open. Only that control link can drive it. The share link watches every change but can't cause one. Free, with no viewer cap on the screens it reaches.

Flash a message to every screen

Send a short line of text from the controller ("five more minutes", "wrap up") and it appears over the countdown everywhere.

Screen count

With phone control on, the board and the phone both show how many screens are watching the countdown right now, so you know the projector and the back row are connected.

The board is the input

Roll the digits with a click, the arrow keys, the scroll wheel (once you've clicked a pair, so scrolling past the board still scrolls the page) or a drag; or type the time; or paste 1h30m, 5:00 or 90s onto it.

Sealed once running

The controls are removed from the page entirely the moment a countdown starts, so nobody opening a shared link can change what the room sees.

Display

Three board styles

Board (mechanical split-flap), Minimal (plain digits), and Light (dark digits on white, for a projector in a bright room).

Fullscreen

One button to fill a projector, a smart TV or an interactive whiteboard.

Pop-out window

A small timer window that stays on top of your slides, your call or OBS, so you can see the time without switching back to the browser (Chrome and Edge on desktop).

Printable poster

A print-ready sheet with the countdown's QR code and end time, for a door or a wall.

Installable app

Add it to a home screen or dock from the browser's own install prompt. It opens fullscreen and works with no connection: the start page and any timer page you've opened load offline, and a shared countdown keeps counting.

Minutes on the app icon

Installed as an app, the icon shows the minutes left while a countdown runs, and shortcuts open a 10- or 25-minute board, the agenda timer or multiple timers straight from the icon.

Offline copy

Download a running countdown as a single self-contained HTML file that keeps counting with no network at all, forever.

Embedding and integrations

Stream overlay for OBS

A transparent, chrome-free browser source with no watermark and no green screen, just the digits over your scene.

Post to Google Classroom or Teams

One click puts the running countdown's link into a Google Classroom post or a Teams message, so students and colleagues open it on their own devices.

Agenda from a sentence, and templates

Type "intro 5 min, 3 speakers 10 min each, Q&A 15" and the agenda builds itself, worked out on your device; or start from a 50-minute lesson, exam, workshop, talk or standup template.

Control from an OBS dock

Pause, add or remove a minute, stop or flash a message from a panel inside OBS (Docks → Custom Browser Docks), using the phone-control link in a compact dock layout.

OBS-aware start

An overlay can wait until you go live in OBS, or restart from the full time every time its scene is shown, using OBS's own browser-source events.

Overtime

Optionally keep counting past zero as +0:42, on every screen with the link, so a talk or break that runs over shows by how much.

Stream themes and presets

Outline, Neon and Glass looks built for gameplay, any digit colour, and one-click Starting soon, Be right back, Intermission and Stream ending presets, with a live preview before you copy the URL into OBS.

Website embed

An iframe builder with size, style and responsive options, producing a countdown for a landing page that shows every visitor the same remaining time.

README badge

A Markdown or HTML snippet for a GitHub README, a forum post, or anywhere only an image is allowed.

Add to calendar (.ics)

Export a countdown's end time as a calendar event.

Zoom, Google Meet, Teams

No extension and no screen share. Paste the link into the call chat and everyone's own screen counts down together.

Tools for in-browser AI agents

Every timer page registers WebMCP tools, so an agent working in your browser can start a shared countdown, set one up for you to start, read what's running and stop it — through the page's own logic, not by guessing where to click.

MCP server for AI assistants

countlink.app/mcp lets an assistant mint a working timer, build a whole agenda from a meeting outline, produce an embed or a badge, and read back what any CountLink link means. No other shared-timer tool has one.

Live board inside ChatGPT and Claude

In assistants that support MCP Apps, the timer the assistant creates appears as a live split-flap board right in the answer, with buttons to start it for everyone, open it full screen or copy the link.

Link previews for join codes

Paste a countlink.app/j/ join link into Slack, Teams, WhatsApp or iMessage and the preview says how long is left and when it ends, not just a generic card.

Setup links anyone can write

countlink.app/#for=25m opens the board ready at that duration — writable by hand, in advance, from a lesson plan, a bookmark or a calendar invite.

Link inspector

Ask any CountLink link what it is: running or ready, its label, and how long is left.

And what it never does

• No account, ever. There is nothing to sign up for and nothing to log into.
• No viewer limit and no timer limit, on any page, at any time.
• No paid tier, so no feature on this site is being withheld from you.
• No watermark on the stream overlay or the website embed.
• No analytics, ads or third-party scripts inside an embed you put on your own site.

Start a countdown · Compare with ShareMyTimer and Stagetimer