TypeSpark does not operate any backend servers, collect analytics, or track user activity. Your Gemini API key is stored locally on your device (storage.local), and your preferences are stored in browser storage (storage.sync). When you type in an editable text field or trigger a rewrite on a site where TypeSpark is enabled, the text of that field/selection is sent directly from your browser to Google's Gemini API (https://generativelanguage.googleapis.com) using your own API key to generate grammar suggestions or rewrites.