Lore

Prompt engineering deserves a proper tool — not a browser tab. Lore is a native macOS playground built specifically for working with large language models. It offers time travel and automatic versioning so you can revisit any previous run, full-text search across all your generations, and built-in model-cost awareness so you always know what you're spending.

Lore supports multiple models, combinatorial runs, custom endpoints, local models, LaTeX, syntax highlighting, notes, export, Vim mode, and sandboxing. Built with Cocoa, SwiftUI, and SQLite, it's a genuinely powerful environment for exploring, iterating, and refining prompts — the kind of tool that makes serious LLM work feel manageable and even enjoyable.