Keep learning sites open, distractions in check, and teachers connected to the classroom. Meet ClassGuard: web filtering and screen sharing built for school.
Only teacher-approved sites during this period.
Allowed · class website
All screens stream together · sample classroom
Every connected screen plays here automatically. Expand is an optional close-up.
Room for the tools
your teachers use.
Practical controls for IT. Useful visibility for teachers. Space for students to learn.
A useful starting list of 2,252 educational and support domains includes everyday classroom tools such as IXL, i-Ready, CommonLit, and ReadWorks.
Add your own exceptions, block distracting categories, or use allowlist-only mode. Keep the optional .edu rule separate.
Inspect the full education list ↗See every connected student’s screen together in one live grid, with a compact layout for larger classes. Screens play automatically. Sharing is required for active participation.
How sharing works ↗Set the websites students can access for each class period. Choose ixl.com for math, change the list as you teach, and restore the school policy automatically when the period ends.
Read the classroom setup guide ↗Bring 1,000+ students in with a CSV. Review the rows, organize class groups, and download a personal enrollment code for every student.
Start small. Put the tools in front of your IT team and a pilot teacher before considering a broader rollout.
Download evaluation kit Extension source + screen-sharing server + setup guidesInspect the extension, educational domains, managed-policy schema, and deployment requirements.
Load the extension on test devices. For screen sharing, run the included pairing server with HTTPS and a private staff key.
Test lesson access, approved screen sharing, student stop controls, and your school’s network.
Students must establish screen sharing to enter the active class. Canceling, stopping, or losing sharing ends their class session. Chrome’s capture prompt is still required.
Live video uses WebRTC. The included pairing server keeps temporary classroom metadata in memory.
ClassGuard is an evaluation-stage toolkit. Your district should review its configuration, security, and privacy requirements.
What to know before your first pilot.
A working Chrome Manifest V3 extension, the filtering dashboard, a student blocked page, teacher and student sharing pages, a Node pairing server, a district CSV roster and enrollment-code exporter, and setup documentation. The education list and managed-policy examples are also included.
The teacher creates a monitored class using a private staff key. Enrolled members of a selected roster group are admitted automatically; open classes require individual approval. Students must establish sharing within 60 seconds using Chrome’s native picker. They become active only after the teacher receives their screen. Canceling, stopping, or losing the stream ends their class session; they must rejoin and share again to participate. This is a ClassGuard session requirement, not a device lock or a bypass of Chrome’s screen prompt.
Yes. When starting a class, set its length and enable Only allow listed websites, then add ixl.com. The installed student extension blocks other HTTP/HTTPS web pages and redirects already-open off-list tabs. Broad education and .edu permissions do not bypass the class list; district blocks still apply. Teachers can edit the list during class. It stays in place after a student leaves sharing, and ends when the teacher ends or releases the restriction, or at the scheduled period end. Browser-only student previews cannot enter restricted classes. Policy changes and early ending reach detached sharing pages through a 30-second extension poll.
Import a district roster CSV with up to 20,000 students. Preview and validate all rows, add or update students by ID, and download personal enrollment codes in one file. Use your real class groups, or let the import create sections of up to 30. Teachers select a group to admit its enrolled students automatically; sharing remains required. Extension installation is a separate managed Chrome rollout step.
Read the bulk enrollment guide ↗Chrome or a Chromebook for the extension, plus an HTTPS-hosted Node 20+ pairing server for screen sharing outside localhost. Your network may need district-configured STUN/TURN services. The kit has setup instructions; extension distribution and school-network testing remain your IT team’s responsibility.
Download screen-sharing setup notes ↗CSV roster import and personal enrollment codes are included. School SSO, verified email identity, SIS synchronization, and central fleet policy synchronization are not included. Teacher access uses a private staff key. Roster classes use registered names; open classes use self-reported names. Chrome managed-policy configuration is supported.
Yes. Download the source and setup guides, inspect the education allowlist, and test with a small classroom. This site does not list paid plans or collect payment. Review the source and discuss your district’s requirements before considering a broader rollout.
Tell us about your school and pilot goals. Email a district inquiry, or download a checklist for your technology team to review.
The inquiry button opens an editable draft in your email app. Review it and send when you’re ready.