Calcish is a versatile macOS tool that merges a calculator with JavaScript scripting capabilities, advanced AI features, and a notebook-like interface. This all-in-one application simplifies quick calculations, script execution, and interaction with both local and remote AI models. Built on QuickJS, Calcish enhances standard JavaScript with more precise calculations for large numbers, fractional arithmetic, vector and matrix operations, and exact currency calculations using decimal types. This makes it a powerful tool for developers and non-programmers alike. The user-friendly interface and comprehensive documentation make Calcish accessible, even for beginners. It features built-in large language models, enabling users to chat with leading AI models like OpenAI's GPT-4 and GPT-3.5, Cohere, and TextSynth via their APIs. One of Calcish's standout features is the scratchpad, which can be opened over other applications for quick scripting and calculations. Users can save their work as a codebook for future reference, making it a convenient tool for continuous learning and productivity.