The Problem
University attendance relying on paper sign-in sheets or basic check-in apps is easily compromised by proxy sign-ins, screenshotted QR codes, and fake GPS locations. In large lecture halls, passing sign-in sheets around causes hallway congestion and class delays, leaving lecturers with tedious manual spreadsheet data entry.
Verification Modes & Anti-Spoofing Architecture
Class-io verifies check-ins across three verification modes: geofenced location verification, 15-second rotating QR codes, or dual-layer enforcement.
Location is confirmed by calculating the geometric mean of multi-sample GPS coordinates against saved room presets: Standard Room (25m), Lecture Hall (32m), Large Lecture Hall (40m), and Auditorium (55m). Rapidly jumping coordinates trigger anti-spoofing flags to reject mock location developer tools.
Dynamic QR codes rotate every 15 seconds, embedding AES-GCM encrypted time-decaying tokens validated against server time. Tokens older than 20 seconds expire automatically, rendering screenshotted or forwarded codes useless.
When campus wifi drops, offline fallback codes queue check-ins locally on the client and sync automatically once network connectivity restores.
Lecturer Workflows & TA Delegation
Lecturers define custom coordinate presets (e.g., "Main Science Lab", "Room 101") to launch sessions instantly. Scheduled auto-attendance configures start and end times alongside class timetables to open and close sessions automatically.
To reduce in-class operational friction, lecturers can delegate attendance controls and student permission requests to Teaching Assistants (TAs) using secure access tokens.
Roster Management & Excel Export
Lecturers manage course enrollments using unique Join Tokens and Student IDs, maintaining the ability to manually remove students from rosters.
At the end of a session, complete attendance logs export directly into formatted Excel spreadsheets (.xlsx) with a single tap, replacing manual reconciliation.
Data privacy and access rights are enforced using Supabase Row-Level Security (RLS), end-to-end encryption, and native display-layer screenshot protection.
Where It Stands
Live in production with 2,000+ active students and 10 lecturers across courses at UENR. Evaluated and demoed directly to department leadership as an active, working platform.