> ## Documentation Index > Fetch the complete documentation index at: https://docs.fallow.tools/llms.txt > Use this file to discover all available pages before exploring further. # Fallow documentation > Get started with Fallow: codebase intelligence for TypeScript and JavaScript. Free static analysis for unused code, duplication, complexity, and architecture drift. Optional runtime intelligence for hot paths, cold paths, and deletion confidence. Fallow is **codebase intelligence for TypeScript and JavaScript**. Use the free static layer to find unused code, duplication, complexity hotspots, architecture drift, and feature-flag branches across your module graph. Add the optional runtime layer when you want to know what actually executed in production. MIT-licensed and open source. Understand how your code is wired. Paid team layer. Understand what actually ran in production. ## Start here ```bash theme={null} npx fallow ``` No config needed for the first run. Dead code, duplication, and complexity, in one pass. ```bash theme={null} npx fallow dead-code npx fallow dupes npx fallow health npx fallow fix --dry-run ``` ## What Fallow helps you do Remove unused files, exports, and dependencies with confidence. Find repeated logic before it spreads. Use complexity and health analysis to focus cleanup work. See hot paths, cold paths, and runtime-backed deletion evidence. ## Pick your workflow Best place to start. Works locally, in CI, and in agent loops. Real-time diagnostics, Code Lens, and one-click fixes in the editor. Structured tool calling for Claude Code, Cursor, and other agents. ## Understand the two layers Static analysis answers: **what is connected to what?** Runtime intelligence answers: **what actually ran?** They meet in `fallow health`. Read the mental model before you set up runtime collection. ## Most-used pages