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.
Built by educators who understand the chaos of a computer lab.
No more walking around helping students type URLs. One click and everyone is where they need to be.
Navigate 30 students to a new page in under 2 seconds. Close the tab when you're done.
Reduce off-task behavior by keeping everyone on the same resource throughout the lesson.
Kick students, close rooms, and regenerate codes with simple controls. Full visibility of who's online.
Once joined, the extension keeps working smoothly even if the browser pauses it in the background. Reliable performance every time.
No tracking, no history collection beyond what you need for the lesson. Students leave no trace when they disconnect.
Built with student privacy and school security in mind.
Students join with a room code only. No email, no signup, no personal data required.
Only teachers can navigate browsers. Students cannot push URLs to others or control the room.
Students can leave the room at any time. Teachers can kick students when needed.
All data encrypted in transit. Our backend ensures teachers only see their own rooms, and students only access content you approve.
Extension only requests what it needs: storage for session, tabs for navigation, and reliability features.
All extension code is included locally. No unexpected updates or external code execution.
Yes, Classcastle is free for teachers. Create unlimited rooms, invite unlimited students.
Chrome, Edge, and any Chromium-based browser. Works on Windows, macOS, ChromeOS, and Linux.
No. Students only need the extension and the room code. No signup, no login, no email required.
Yes. Classcastle doesn't lock their browser — it just pushes URLs. Students can still navigate independently if needed.
Students without the extension simply won't receive navigation commands. They'll still appear in your room list but won't sync.
We only collect what's needed: student name (for identification), online status, and the current URL for the teacher dashboard. No browsing history or tracking.