Developer Tools
Free, browser-based utilities for AI development, JSON, text, encoding, and more. 8 tools — all run in your browser.
Prompt Tools
3 tools
Token counters, cost calculators, and context window analyzers for LLM prompts.
Prompt Tools
Prompt Token Counter
Count tokens in your prompts for GPT-4, Claude, Llama, and other AI models.
Open tool
Prompt Tools
Prompt Cost Calculator
Estimate API costs for your prompts across major AI providers and models.
Open tool
Prompt Tools
Context Window Calculator
Check if your content fits within the context window of different AI models.
Open tool
Schema Tools
2 tools
JSON Schema generators, AI output schema builders, and validation utilities.
API Tools
2 tools
OpenAPI validators, spec converters, and REST API tooling.
MCP Tools
1 tool
Model Context Protocol tool schema validators and server configuration helpers.