One Brain by Toolvoid

One Brain connects supported AI chat pages to the One Brain desktop app running on your computer. Pair each site with a one-time code and approve the extension in the app. Save messages or conversations to local memory, search your memories, and review useful context before inserting it into a chat. Depending on your per-site settings, you can also save messages automatically. Supports ChatGPT, Claude, Gemini, DeepSeek, Groq Playground, and Perplexity. Extension requests go to the local app at 127.0.0.1. One Brain has no cloud service, account, analytics, or advertising. The desktop app must be installed and running. Text submitted to an AI provider is handled under that provider’s privacy policy.