What tools do AI engineers need?

AI engineers need tools for understanding how models process text (tokenizers), comparing model capabilities and pricing, building and testing prompts, estimating API costs, planning context window budgets, and generating function calling schemas. These tools cover each of those workflows.

Are these AI tools free to use?

Yes. All tools are completely free, run entirely in your browser, and require no sign-up or API keys. Your data never leaves your device.

Do these tools work with GPT, Claude, and Gemini?

Yes. The cost calculator, model comparison, and context calculator include up-to-date pricing and specs for all major providers: OpenAI, Anthropic, Google, DeepSeek, Mistral, and Meta. The schema builder exports in both OpenAI and Anthropic function calling formats.

AI Developer Tools

Free, browser-based tools for AI engineers. No sign-up, no API keys. Your data never leaves your device.

Get Insanely Good at AI

How to Work Smarter, Build Faster, and Think Better with AI

The understanding that lets you pick up any AI tool, current or future, and use it well. From how LLMs actually work to building agents that hold up in production.

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Understand

See how AI works under the hood

AI Tokenizer

See how "Hello world" becomes 2 tokens. Visualize BPE tokenization in real time with the same algorithm ChatGPT uses.

AI Model Comparison

Every major AI model side by side. Filter by provider, compare pricing, and get personalized recommendations based on your use case.

Design

Craft better inputs for better outputs

System Prompt Builder

Build structured system prompts step by step with production-ready templates for code review, data analysis, RAG, and more.

Schema Builder

Define AI tool functions visually and export in OpenAI, Anthropic, or raw JSON Schema format. Syntax-highlighted output with validation.

Prompt Analyzer

Paste any prompt and get it scored against the Context, Instruction, Constraints framework. See what's strong and what's missing.

Optimize

Ship faster, spend less

Cost Calculator

Compare monthly costs across 15 AI models. Pick a scenario, adjust parameters, and see which model fits your budget.

Context Calculator

Plan your token budget across system prompts, tools, history, and RAG context. Live token counting with the GPT tokenizer.

Frequently asked questions

What tools do AI engineers need?: AI engineers need tools for understanding how models process text (tokenizers), comparing model capabilities and pricing, building and testing prompts, estimating API costs, planning context window budgets, and generating function calling schemas. These tools cover each of those workflows.
Are these AI tools free to use?: Yes. All tools are completely free, run entirely in your browser, and require no sign-up or API keys. Your data never leaves your device.
Do these tools work with GPT, Claude, and Gemini?: Yes. The cost calculator, model comparison, and context calculator include up-to-date pricing and specs for all major providers: OpenAI, Anthropic, Google, DeepSeek, Mistral, and Meta. The schema builder exports in both OpenAI and Anthropic function calling formats.

Learn the concepts behind the tools

These tools implement techniques from Get Insanely Good at AI: tokenization, prompt engineering frameworks, cost optimization, function calling patterns, and more. The book explains the why. The tools let you practice.

Get the book →