# Builder Wrench > Developer tools for AI standards. Builder Wrench creates free and premium developer tools for emerging AI standards like llms.txt, MCP, and A2A. We help developers make their websites AI-ready with generators, validators, and monitoring. We also build free browser extensions and web games. ## Tools - **llms.txt Generator**: Create a valid llms.txt file for your website. Visual editor with live preview. Free tier (3/day) + Pro ($29 one-time). - **llms.txt Checker**: Validate any site's llms.txt. Scores completeness, finds issues. Free tier + Pro + $5/mo monitoring. - **Agent Card Generator**: Build a valid /.well-known/agent.json for Google's A2A protocol. Free tier + Pro. - **AI Token Counter**: Count tokens for GPT-4, Claude, Gemini, Llama. Cost estimates across models. 100% free, client-side. - **AI Readiness Inspector**: Full inspection of llms.txt, robots.txt, agent card, structured data, meta tags. One report. Free tier + Pro + monitoring. ## Browser Extensions - **No Pause Playback Free**: Prevents websites from pausing audio/video when you switch tabs. Free on Chrome and Firefox. ## Games - **MysterySolve**: Lateral thinking puzzle game. Solve mysteries by asking yes/no questions. Free to play at mysterysolve.com. ## Key Information - **Website**: https://builderwrench.com - **Developer**: Builder Wrench - **Category**: Developer Tools - **Pricing**: Freemium (free tier + $29 one-time Pro + $5/mo monitoring) ## Links - [Homepage](https://builderwrench.com/) - [llms.txt Generator](https://builderwrench.com/tools/llms-txt-generator) - [AI Readiness Inspector](https://builderwrench.com/tools/ai-readiness-inspector) - [What is llms.txt Guide](https://builderwrench.com/guides/what-is-llms-txt) - [Privacy Policy](https://builderwrench.com/privacy)