# Stark CBT — Offline LAN Computer-Based Testing Platform

> Stark CBT is an offline-first, server-authoritative Computer-Based Testing (CBT) platform engineered by XpanSieve (https://xpansieve.studio) for school local area networks (LANs). It enables secondary schools, colleges, and examination centers to conduct high-stakes student examinations without requiring an active internet connection, external database installation, or cloud hosting fees.

## Core Capabilities
- **100% Offline LAN Architecture**: Operates fully on local Wi-Fi or Ethernet switch. Never pauses or fails due to ISP downtime, SIM router failure, or power fluctuations.
- **Pure-Go + SQLite 3 WAL**: Single-binary Go server (`cbt-server`) with embedded SQLite 3 WAL database. Zero external dependencies (no Apache, MySQL, PHP, Docker, or Node.js required on the server machine).
- **Server-Authoritative Anti-Cheat**: Untrusted browser model where answer keys never touch the client browser. Fullscreen lock, window blur, and tab switch logging report student violations in real-time.
- **KaTeX Mathematics & Science**: Native formula editor rendering quadratic equations, fractions, matrices, chemical formulas, and physics diagrams offline.
- **Built-in Scientific Calculator**: Accessible directly inside the student exam runner, preventing app-switching or external calculator smuggling.
- **High Concurrency Performance**: Rigorously load-tested with 100 to 500+ simultaneous student submissions completing in under 50ms average transactional burst latency.
- **Legacy Hardware Compatibility**: Runs smoothly on older computer lab machines with 2GB RAM running Windows 7, 8, 10, 11, or Linux.
- **Instant Automated Grading**: Grades student submissions in milliseconds and produces downloadable CSV/PDF report card transcripts.

## Products & Binaries
- **Stark CBT Control Panel**: Desktop GUI management interface for non-technical school invigilators with one-click start/stop, network IP auto-detection, and backup restore.
- **Stark CBT Server**: Standalone console/daemon executable for Windows (`.exe`) and Linux (`.deb` / binary).
- **Stark CBT Student Exam App**: Dedicated secure full-screen browser kiosk executable (`stark-cbt-student.exe` for 64-bit and `stark-cbt-student-x86.exe` for legacy 32-bit Windows).
- **LAN Probe**: Automatic network broadcast discovery utility to find the CBT server on complex subnets.

## Pricing & Licensing (by Student Capacity)
All plans include the complete application suite with zero feature restrictions:
- **Up to 100 Students**: ₦100,000 / term | ₦250,000 / annual session | ₦600,000 lifetime
- **Up to 200 Students**: ₦150,000 / term | ₦350,000 / annual session | ₦850,000 lifetime
- **Up to 500 Students**: ₦225,000 / term | ₦500,000 / annual session | ₦1,200,000 lifetime
- **Up to 1,000 Students**: ₦350,000 / term | ₦750,000 / annual session | ₦1,750,000 lifetime
- Full machine-readable pricing specification: https://starkcbt.xpansieve.studio/pricing.md

## Key URLs
- Homepage: https://starkcbt.xpansieve.studio/
- Features & Security: https://starkcbt.xpansieve.studio/features/
- Software Downloads: https://starkcbt.xpansieve.studio/downloads/
- Transparent Pricing Plans: https://starkcbt.xpansieve.studio/pricing/
- Platform Comparison: https://starkcbt.xpansieve.studio/compare/
- School Lab Setup Guide: https://starkcbt.xpansieve.studio/docs/
- Book a Demo / Contact: https://starkcbt.xpansieve.studio/contact/
- Privacy Policy: https://starkcbt.xpansieve.studio/privacy/
- Terms of Service: https://starkcbt.xpansieve.studio/terms/
- NDPA Data Protection: https://starkcbt.xpansieve.studio/data-protection/
- Parent Studio: https://xpansieve.studio/