Built for a projector, not a phone
The ring is the default here for a reason. A child who cannot yet read a clock can still see how much of the circle is left, and so can anyone at the back of the room who cannot make out the digits. The proportion remaining is legible from much further away than a number is.
It is silent. A timer that ends with an alarm sound is a timer that startles the room and interrupts every other class within earshot; a screen that turns red and flashes does the same job without the noise.
- Timed activities and group work
- Transitions between tasks, where the countdown itself does the reminding
- Tests and exams, where a visible clock stops the questions about how long is left
- Quiet reading periods
A lesson timer that needs no account
There is nothing to sign up for, nothing to install and no advertising. It is a single page, which matters on a school network where installing anything is a request to somebody else.
Set the length, then bookmark the link. A five minute timer and a twenty minute timer are two different bookmarks, both ready before the lesson starts.
Running it on a classroom display
Open it on the teaching computer, press F11 so the browser interface disappears entirely, and press Start. Escape brings everything back.
The last ten seconds turn amber, which gives the room a warning to finish up without you having to say anything.