Free Developer Tools
Free, client-side tools for building with AI coding agents. Everything runs in your browser, nothing is uploaded, and the ones that carry data check it against the source.
Cost & models
- AI Coding Agent Cost Calculator
- Estimate what a coding task costs across models, with a realistic retry multiplier most calculators skip.
- AI Model Comparison: Context Window & Price
- Compare frontier models by context window, max output, and per-token price. Sortable, checked against vendor docs.
- LLM Token Counter
- Estimate the token count and per-model cost of any text or prompt, in your browser.
- Context Token Budget Planner
- Plan a prompt across files against a model's context window and see what fits or overflows.
Agent config
- AGENTS.md Generator
- Answer a short form and get a production-grade AGENTS.md for your repo.
- MCP Server Config Generator
- Build a valid MCP config for Claude Code, Claude Desktop, and Cursor from a server picker.
- Cursor Rules Generator
- Generate a .cursor/rules .mdc file with the right frontmatter for how it applies.
- llms.txt Generator
- Build a spec-valid llms.txt so coding agents and answer engines can read your site.
Pickers & utilities
- Which AI Coding Agent Should I Use?
- Answer a few questions and get a recommendation from a sourced set of coding agents.
- RAG Chunking Visualizer
- Paste text, pick a chunk size and overlap, and see the chunks with per-chunk token counts.
- LLM JSON Output Validator & Repair
- Paste model JSON output to find where it breaks and preview a repaired version.
Legal & contracts
- Free Contract Template Generator
- Generate a mutual NDA, one-way NDA, or dev-agency services agreement as signable markdown, in your browser.
- AI Contract Checker (Rule-Based)
- Paste a contract and get a deterministic scan for missing clauses and risky language, with severities.