AI Dev Toolkit

How it works

• 39 free tools and about 450 indexable pages in one place: a token counter using each model's real tokenizer, LLM cost, prompt-caching and batch calculators, model comparisons, GPU/VRAM checks, chat-format converters and a database of 35 Claude Code errors with verified fixes.
• Claude Code builders and checkers for CLAUDE.md and AGENTS.md, settings.json permissions, hooks, slash commands, subagents and skills, plus a converter between Cursor, Copilot, Windsurf and Claude Code rule files.
• Model prices refresh every day from free public sources through a GitHub Action, with a sanity check that stops implausible prices before they reach the site and failure isolation so one broken source never blocks the rest.
• Private by design: every tool runs in the browser, and the features that call an AI provider use the visitor's own key, sent straight from the browser to that provider and never to the site's server.
• Accuracy is tested, not assumed: about 5,000 unit tests and 350 browser tests, numbers on pages computed from data rather than typed by hand, and every page lists its sources and the date they were checked.
• Directories of about 20,000 MCP servers from the Official MCP Registry, 58 reviewed by hand with install steps, and 62 Claude skills whose licences are checked before any file is copied.
• Runs on Cloudflare Workers' free plan for $0 a month, with Lighthouse accessibility, best-practices and SEO scores of 100 and no layout shift on mobile or desktop.

Stack

Role — Creator