AI
🚀 Free developer utilities — no signup required

Developer Tools for the AI Era

Free, browser-based tools for prompt engineering, JSON Schema, OpenAPI, and MCP. Everything runs in your browser — your data never leaves your machine.

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8+

Tools

100%

Free

0

Data Collected

5

Categories

Tool Categories

Purpose-built utilities for every stage of AI development

Prompt Tools

3 tools

Schema Tools

2 tools

API Tools

2 tools

MCP Tools

1 tool

JSON Tools

0 tools

Text Tools

0 tools

Encoding Tools

0 tools

Hash Tools

0 tools

All Tools

Everything runs in your browser — no install, no signup

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Prompt Tools

Prompt Token Counter

Count tokens in your prompts for GPT-4, Claude, Llama, and other AI models.

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Prompt Tools

Prompt Cost Calculator

Estimate API costs for your prompts across major AI providers and models.

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Prompt Tools

Context Window Calculator

Check if your content fits within the context window of different AI models.

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Schema Tools Soon

JSON Schema Generator

Generate valid JSON Schema from sample JSON data instantly.

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Schema Tools Soon

AI Output Schema Generator

Generate structured output schemas for AI model responses and function calls.

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API Tools Soon

OpenAPI Validator

Validate OpenAPI 3.x specifications against the official schema.

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API Tools Soon

OpenAPI to MCP Generator

Convert OpenAPI specifications to Model Context Protocol tool definitions.

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MCP Tools Soon

MCP Tool Schema Validator

Validate Model Context Protocol tool schemas and server configurations.

Open tool

Why AIDevUtils?

Privacy First

All processing happens in your browser. No data is ever sent to a server.

Instant

No signup, no install, no loading screens. Open and use immediately.

Always Free

Every tool is free. No premium tiers, no credits, no paywalls.

Developer-Grade

Built by developers for real workflows. Accurate, reliable, practical.

Frequently Asked Questions

Are all AIDevUtils tools free?
Yes. Every tool on AIDevUtils is completely free to use. There are no paid plans, no premium features behind a paywall, and no signup required.
Do you collect my data?
No. All tools run entirely in your browser using client-side JavaScript. No data you enter is ever sent to a server. We do not collect, store, or share your inputs.
What tools are available?
We have tools for prompt engineering (token counting, cost calculation, context window analysis), JSON Schema generation, OpenAPI validation, and MCP (Model Context Protocol) tooling. More tools are added regularly.
What is MCP (Model Context Protocol)?
MCP is an open standard by Anthropic that lets AI assistants like Claude securely connect to external data sources and tools. Our MCP tools help you validate and generate MCP-compatible tool definitions.
Can I use these tools offline?
Once a page is loaded, most tools work without an internet connection because all processing happens in your browser. We recommend bookmarking the tools you use most.

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Free tools. No account needed. Works in your browser right now.

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