Building a Real-Time VPN Monitoring System on Google Apps Script (Zero Cost)

Dec 22, 2025 · 7 min read · TL;DR I built an automated VPN testing system that runs 24/7 on Google Apps Script's free tier. It measures 15 VPNs every 6 hours from Tokyo, analyzes stability using statistical methods, and publishes all data via a REST API. Total cost: $0/month. L...