MacWriteBuddy fixes spelling, grammar, and punctuation in any Mac app. Select text, press ⌃⌥G, and the clean version replaces it in place (⌘Z undoes it). Run a model offline on your Mac (llama.cpp or Apple Intelligence) or bring your own OpenAI, Anthropic, Gemini, OpenRouter, or Ollama key. No login, and your writing never touches our servers. Fixing is free; Pro ($39 once) adds rewrite, translate, summarize, prompt improver, custom actions, and memory.