I shipped 41 tools on a $5 VPS in 4 days — here is everything I learned

Four days ago I started a 30-day challenge: ship as many useful tools as possible on a single $5 VPS, using Python + Flask + SQLite + systemd. No Docker, no Kubernetes, no cloud functions. Today the counter is at 41 tools across 9 categories , all live at foxyyy.com . What I shipped Crypto & Trading (the starting point): Cross-exchange funding rate scanner (20 exchanges, ~6,800 perps) Autonomous signal alerts bot Exchange uptime tracker Historical dataset (2.58M rows, CC BY 4.0) Developer Tools (the largest category): Regex Tester — live matching with capture groups JSON Formatter — validate + pretty-print + minify Cron Explainer — paste a cron expression, get English Base64/JWT Decoder — client-side, nothing sent to server UUID Generator , Timestamp Converter , HTTP Status Codes Markdown to PDF — paste markdown, download styled A4 PDF Screenshot API — capture any webpage as PNG cronviz — OSS CLI for cron/systemd observability French Business Tools : Invoice PDF Generator — auto-entrep