# How We Built PrezScan: Free Hardware-Free Biometric Attendance for Indian Universities

> Source: <https://dev.to/nitin_dubey_c80723fdab031/how-we-built-prezscan-free-hardware-free-biometric-attendance-for-indian-universities-3mcl>
> Published: 2026-11-02 18:11:47+00:00

Every morning across engineering colleges and universities in India, hundreds of people line up in front of wall-mounted fingerprint machines that break down and cause morning delays.

To solve this, we built **PrezScan** ([https://prezscan.onrender.com](https://prezscan.onrender.com)) — an independent, 100% free, hardware-free smart attendance web app engineered specifically for Indian higher-education campuses.

**Dual-Lock Anti-Proxy Attendance**:

Enforces a physical double-lock combining on-device 68-point AI facial recognition with academic building Wi-Fi subnet (CIDR) geofencing. Marking attendance outside the campus building or buddy-punching is physically impossible.

**Sub-200ms Verification**:

Runs client-side directly in the browser engine using WebGL GPU acceleration.

**100% Privacy by Design (DPDP Act 2023 Compliant)**:

Raw face photos are never sent over the internet or stored on servers; only local 128-dimensional mathematical vector embeddings are evaluated.

**1-Click Audited Excel Reports**:

Monthly attendance ledgers export complete timestamps and session hours instantly in formatted spreadsheets.

• Live Web Application: [https://prezscan.onrender.com](https://prezscan.onrender.com)

• Source Code & Documentation: [https://github.com/Nitin091307/attendanceforu](https://github.com/Nitin091307/attendanceforu)