AI & LLM Tools
Tools for AI developers: token counting, cost calculation, prompt engineering, model comparison, and config generation for Claude, GPT, Gemini, and more — all in your browser, prompts stay private.
16 tools — All free, no sign-up, runs entirely in your browser.
LLM Token Counter
Count tokens for GPT-4, Claude, Gemini, and Llama models with cost estimates.
LLM Cost Calculator
Compare API costs across 17+ AI models. Calculate daily and monthly spend.
AI Model Comparison
Compare 13+ AI models: pricing, context windows, capabilities. Filter by use case.
Context Window Visualizer
Visualize how much of an LLM's context window your prompt fills.
Prompt Diff
Compare two AI prompt versions side by side with inline diff highlighting.
System Prompt Builder
Build structured system prompts with templates for code, writing, and analysis.
Function Calling Schema Builder
Build tool/function calling schemas for OpenAI and Anthropic APIs visually.
SSE Stream Parser
Parse and debug Server-Sent Events streams from AI API responses.
.cursorrules Generator
Generate Cursor AI project config files with framework-specific presets.
CLAUDE.md Generator
Generate Claude Code project instruction files with 8 project type templates.
MCP Config Generator
Generate Model Context Protocol server config for Claude Desktop and Cursor.
AGENTS.md Generator
Generate AGENTS.md files for AI coding agents with role and constraint presets.
AI Response Formatter
Format and clean up AI model responses for better readability.
Structured Output Validator
Validate AI structured output against JSON schemas.
Vibe Coding Prompt Builder
Build effective coding prompts for AI assistants.
Prompt Diff Tool
Compare two prompts side-by-side to see differences.