I Built 20 Security Scanners in Python — Here's What I Learned

Over the past two weeks, I built 20 open-source security scanning tools in Python. Each one solves a specific problem. Each one is a single file. And together, they form a complete DevSecOps toolkit. Here's what I learned building them — and the full list so you can use them. Why I Built 20 Tools Instead of 1 The security industry loves monolithic platforms. $50K/year SaaS tools that do everything, badly. I took the Unix philosophy approach: each tool does one thing well . Chain them together for comprehensive security coverage. The Complete Toolkit Code & Secrets Scanning 1. Git Secrets Audit — Scan entire git history for leaked credentials. Catches what .gitignore missed — secrets already committed. 2. Env Secrets Checker — Find .env files accidentally committed to repos. Even deleted ones still exist in git history. 3. API Secrets Scanner — Grep source code for exposed API keys using 30+ regex patterns. Dependency Security 4. GitHub Security Scanner — Cross-repo vulnerability dashbo