Turn any screen into a split-flap board

Clack turns an old iPad, a spare monitor or a TV into a clacking departure board for your home: live trains, the weather, the time, and messages from your family. It runs in the browser, with no app and no subscription.

Demo board. Train times are sample data.

A board that earns its spot on the wall

Every flap steps through the drum one card at a time, just like the real thing, and every step clacks. You set it up once and leave it running.

Real flaps, real clack

Characters roll forward through the drum instead of cross-fading. The sound is made on the spot for each flap, so a full board sounds like a full board.

Live departures

Every passenger station in Finland, live from Fintraffic: platform, line and destination, with yellow tiles for late trains and red for cancelled ones.

Weather anywhere

The current conditions and a three-hourly forecast for any place in the world, from the Norwegian Meteorological Institute.

Send it a message

Share a private link with your household. Anyone with it can put a note on the board from their phone, no app needed.

Uses what you have

Any screen with a browser: an iPad from a drawer, a Raspberry Pi on a monitor, a laptop, or a TV browser. Add it to the home screen and it runs full screen.

Pay once

No account and no subscription. One key unlocks Pro on all your own screens, and the free board is yours to keep either way.

Up in two minutes

Nothing to install.

Open Clack

Go to this site on the screen you want to use and tap Try it free. On an iPad, use Share → Add to Home Screen to get the full-screen version.

Pick your screens

Tap the board and open settings. Choose a station, a place for the weather, and a message, and how often the screens should change.

Leave it clacking

Plug it in and set the screen to stay awake. It keeps itself up to date from there.

Pricing

Try the free board for as long as you like. Pro is a single payment.

Free

$0
  • The full flap board with sound
  • One screen: the clock or your own message
  • Black or white flaps, any size
  • A small “Clack Free” badge in the corner
Open the free board

Pro

$12 ONCE
  • Live train departures (Finland)
  • Weather for any place in the world
  • Rotating screens on your own timing
  • A send-a-message link for your household
  • No badge, and every screen you own
Get Clack Pro

Secure checkout by Stripe. Your key appears straight after you pay.

Questions

Which devices does it run on?

Anything with a recent browser: iPad and iPhone (Safari), Android tablets, Mac, Windows, Linux, Raspberry Pi and Chromebooks. Older iPads work best added to the home screen, with Auto-Lock set to Never.

Which countries have train departures?

Finland for now: every passenger station, live. The clock, weather and messages work everywhere.

Is it a subscription?

No. You pay once, and your key keeps working.

How many screens can I use?

All the screens in your own home or office. One key covers them.

Does it need the internet?

Trains, weather and messages need a connection. The clock and your own messages keep running offline once the page has loaded.

What if I don’t like it?

Email us within 30 days of buying for a full refund, no questions asked.

I lost my key.

Email us with the address you used at checkout and we’ll send it again.