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  • About AI Dev ToolkitWho builds AI Dev Toolkit, why the tools are free and private, how the data is sourced, and how to reach Tahir Nazir, the developer behind it.Page
  • ContactEmail Tahir Nazir about AI Dev Toolkit: report a wrong price or broken tool, suggest a new tool or error fix, or ask about privacy and data.Page
  • Privacy PolicyHow AI Dev Toolkit handles your data: tools run in your browser, API keys go straight to the provider and are never stored, and analytics are cookie-less.Page
  • Terms of UseThe terms for using AI Dev Toolkit: free tools provided as-is, estimates without warranty, acceptable use, and your responsibility for your own API keys.Page
  • DisclaimerPrices, token counts and hardware estimates on AI Dev Toolkit can be out of date or approximate. We are not affiliated with Anthropic, OpenAI or Google.Page
  • Cookie PolicyAI Dev Toolkit sets no tracking cookies today. See what is stored on your device (theme, optional saved key) and how consent will work if ads are added.Page
  • MethodologyHow AI Dev Toolkit collects model prices, counts and estimates tokens, tests every tool and error fix, labels estimates, and corrects mistakes quickly.Page

Free AI developer tools for tokens, costs and configs

Count tokens, estimate API bills, compare models, check what your GPU can run, and generate Claude Code and MCP configs. Most tools run entirely in your browser.

The first tools launch soon. Here’s what’s coming.

Tokens & Costs

Count tokens, estimate API bills and see which models fit your budget and context.

  • AI Token CounterSoonCount tokens for GPT, Claude, Gemini, Llama and more.
  • LLM API Cost CalculatorSoonEstimate per-request, daily and monthly API costs.
  • AI Model ComparisonSoonCompare prices, context windows and features across models.
  • Context Window CheckerSoonSee whether your text fits each model's context window.
  • Subscription vs API CalculatorSoonFind out whether a chat plan or the API is cheaper for you.
  • GPU / VRAM CalculatorSoonCheck how much VRAM a local model needs and which GPUs fit.
  • Prompt Caching CalculatorPlannedEstimate savings from prompt caching.
  • Batch API Savings CalculatorPlannedCompare batch and real-time API costs.
  • Tokens to Words ConverterPlannedConvert between tokens, words and pages.

Coding Agents

Configs, fixes and references for Claude Code, Cursor, Copilot and MCP.

  • Claude Code Error DatabaseSoonExact Claude Code error messages with tested fixes.
  • CLAUDE.md GeneratorSoonGenerate a CLAUDE.md and AGENTS.md for your project.
  • MCP Config GeneratorSoonBuild MCP server configs for Claude, Cursor, VS Code and Windsurf.
  • Claude Skills DirectoryPlannedBrowse and copy Claude Code skills.
  • MCP Server DirectoryPlannedFind MCP servers with install snippets.
  • Claude Code Hooks BuilderPlannedBuild settings.json hooks visually.
  • AI Rules ConverterPlannedConvert Cursor rules, Copilot instructions and CLAUDE.md.

Prompts

Build, compare and reuse prompts with live token counts.

  • Prompt Template LibraryPlannedReusable prompts for coding and writing.
  • Prompt BuilderPlannedBuild prompts with variables and a live token count.
  • Prompt DiffPlannedCompare two prompt versions side by side.

Playground

Try models with your own API key, called straight from your browser.

  • Gemini API PlaygroundSoonTry the Gemini API free with your own key.
  • Multi-Model PlaygroundPlannedSend one prompt to several models side by side.
  • API Key CheckerPlannedCheck whether an API key works, without storing it.

Utilities

Repair LLM JSON, convert chat formats, chunk text and manage AI crawlers.

  • AI Crawler robots.txt GeneratorSoonBlock or allow GPTBot, ClaudeBot and other AI crawlers.
  • JSON RepairSoonFix broken JSON from LLM output.
  • Chat Format ConverterPlannedConvert messages between OpenAI, Anthropic and Gemini.
  • RAG Text ChunkerPlannedVisualise chunk size and overlap for RAG.

Free API Keys

Step-by-step guides to getting free and paid API keys from each provider.

  • Free Gemini API Key GuideSoonGet a free Gemini API key in a few minutes.
  • Free Groq API Key GuidePlannedGet a free Groq API key.
  • OpenRouter API Key GuidePlannedGet an OpenRouter key and use free models.

Guides

Plain-English explanations, tested by hand, that link to the tools you need.

  • What is a token? Examples across GPT, Claude and GeminiSoon
  • How to estimate LLM API costs before you shipSoon
  • How much VRAM do you need to run an LLM locally?Soon
  • How to set up MCP servers in Claude CodeSoon
  • How to write a good CLAUDE.mdSoon
  • How to block AI crawlers with robots.txtSoon

Private by default

Most tools run in your browser, so text you paste stays on your device. Tools that need a server say so.

Your key, your bill

Playgrounds call the provider straight from your browser. We never see your API key. How keys are handled

Dated and sourced

Every price shows when it was last checked and where it came from. Our methodology