AI Developer Toolkit — 108 Prompts, Cost Calculator & API Templates

Stop Wasting Time on AI API Trial and Error

Everything you need to build with AI APIs: 108 battle-tested prompts, an interactive cost calculator, model selection guide, and copy-paste code templates for OpenAI, Anthropic, and Google.

What's Inside

Who This Is For

Updated April 2026 — covers GPT-4.1, Claude 4, Gemini 2.5, o3/o4, and more.