Nixmac

Nix-darwin lets you manage a Mac's entire configuration as reproducible, version-controlled code, but the syntax is a genuine barrier for most people, which is exactly the gap Nixmac fills. You tell it what you want in plain English, an AI agent reads your existing config, writes the Nix changes, builds them, and shows you a full diff before touching your actual system. Nothing applies until you approve it, and every applied change becomes a git commit with a semantic message, so your Mac's setup history reads like a real changelog instead of a pile of manual tweaks nobody remembers making.

The core app is free and open source with no account required, which is unusually generous for a tool built around AI inference. You can bring your own Anthropic or OpenAI API key, pay as you go through Nixmac's hosted models, or run everything locally and offline through Ollama if you don't want to pay for inference at all. The $4.99/month Pro tier is really just for device sync across multiple Macs, not a paywall on the core functionality. It's a genuinely niche tool, useful only if you're already sold on Nix's reproducible-system philosophy, and it inherits Nix's learning curve even with the plain-English layer on top when something needs deeper troubleshooting.