PaletteBrain

What it does

PaletteBrain is a macOS app that brings ChatGPT into any application or website through a keyboard shortcut. Select text, press the shortcut, and run a saved command to fix grammar, translate, summarize, or rewrite. It uses your own OpenAI key, so usage costs go directly to OpenAI.

PaletteBrain adds a shortcut layer for ChatGPT on macOS. You highlight text in any app or website, press Option plus Space, and pick a command such as Fix Grammar & Spelling, Translate to English, Summarize to Bullet Points, or Convert to Blog Post. The reply can be pasted back into the original app with another shortcut. The site says it works with Notion, Google Docs, Slack, Discord, Gmail, and other apps. You bring your own OpenAI key and pay as you go directly to OpenAI, with no ChatGPT Plus subscription needed. It also supports native Microsoft Azure OpenAI, so you can swap API keys. The license is a one-time purchase of $29, and the site states there are no recurring fees. The same page warns that the price will go up to $99 per year as the roadmap progresses, so the lifetime offer may change. Before buying, check that your Mac meets the app requirements and that you are comfortable managing an API key. The page does not state whether an account is required, whether a free plan exists, or whether the software is open source.