Classcastle is a teacher web app paired with a lightweight browser extension for students. You run the room from any browser; they join with a code. When it's time for the task, you press one button, and every student's browser opens the same page — no reading URLs off the whiteboard, no lost kids.
Free for teachers. Works on Chromebooks. No student accounts needed.
30 students, one command: go to microbit.org
Set up once, then it disappears into the background of your teaching.
No install for you — it runs in any browser. Start a room and you get a short code to put on the board.
A small add-on for Chrome or Edge, installed once. Students type in your room code and light up green in your teacher view.
Type the page once — microbit.org, a quiz, a shared doc — and every joined browser navigates there together, instantly.
No heavy install, no login walls. It runs quietly and doesn't slow down ageing school machines.
See who's joined and where their browser currently is, at a glance, from your own screen.
Send students to any URL — a site, a form, a game, a shared document. If it's a webpage, Classcastle can send them there.
You don't need every student clicking install one by one. Push the extension centrally and it's ready before the first lesson.
Find Classcastle's ID and store listing under Admin → Deployment in the teacher app. You'll use this ID in your policy.
Add it to ExtensionInstallForcelist in the Google Admin console for ChromeOS and Chrome, or push it via Intune or GPO for Edge. No end-user action required.
Safelist Classcastle's domain in your web filter or firewall so room connections aren't blocked on the school network.
Confirm the icon appears pinned and can join a test room, then roll out to the rest of the fleet with the same policy.