A Chrome extension for UMass students that keeps your courses offline, proves your work was done on time, and submits it the moment Canvas is back.
Due this week
COMPSCI 532
Homework 4
Tonight 11:59 PM
COMPSCI 689
Project milestone
Thu
COMPSCI 684
Reading response
Fri
Every assignment, rubric and file type.
Readable with zero bars.
Late policy included.
One click, all your materials.
Your file gets a SHA-256 fingerprint on your laptop. The file stays with you.
Step 1We submit normally first. Most nights, that's it.
Step 2If Canvas is down, FreeTSA timestamps the fingerprint. Proof that doesn't need to trust us.
Step 3Gemini drafts a short note, Gmail opens, you hit send.
Step 4Your sealed file waits safely on your laptop. The moment Canvas answers again, CampusFallback submits it and pings you.
CampusFallback
Submitted to COMPSCI 532 · Homework 4
12:41 AM
Courses and files live in your browser. Our server only ever sees a fingerprint.
Timestamps come from FreeTSA, not our clock, so nobody can fake them. Not even us.
We read only what you can already see, at a polite pace. Never anyone else's data.
Gradescope is back. Upload Homework 5 now →
11:52 PM · Gradescope: down · Panic: none
Gradescope asks you to tag your own pages, so we never auto-submit there. Instead we seal your file, draft the email, and ping you the second Gradescope is back, with a link straight to the assignment.
That's always their call. But they get the exact file and a timestamped proof from before the deadline. That's a strong case.
It reads only your own courses with your own login, like the Canvas app does. Course materials never leave your laptop.
Use your phone's hotspot. Sealing sends just a 64-character fingerprint, so even one bar works.
Drop the file on our verify page. It's fingerprinted in your browser, never uploaded, and matched against its sealed receipt.