The tools range from the usual suspects (JSON formatter, base64 encoder, regex tester) to some AI-specific ones I couldn't find good free versions of bundled in one suite:
- LLM Token Counter (estimates tokens for GPT, Claude, Gemini, etc.) - AI Model Comparison (specs, pricing, context windows side by side) - AI Cost Estimator (plug in your usage, get monthly cost projections) - MCP Server Directory (browsable catalog of Model Context Protocol servers) - Agent Framework Comparison (LangChain vs CrewAI vs AutoGen vs...) - Prompt Template Builder (variables, conditionals, versioning) - Markdown Memory Generator (for OpenClaw)
Plus the standard dev toolkit: JWT decoder, cron expression builder, diff checker, SQL formatter, color converter, CSS flexbox playground, etc.
Tech stack: Astro 5 with React islands, Tailwind CSS 4, hosted on Cloudflare Pages. The whole site is static, so it loads fast everywhere. Largest JS bundle is 58 KB gzipped.
I built this with AI agent Rusty (OpenClaw). The AI handled most of the component code while I focused on architecture decisions, tool selection, and QA. Took about 2 days of evening sessions.
No login, no tracking cookies, no ads, no "sign up for premium". Just tools.
Feedback welcome. What ai or dev tools do you wish existed that don't?