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Only in your browser. Your typing history, per-key stats and settings are saved locally with Chrome's storage and are never uploaded. You can export a JSON backup or a CSV of your sessions, or erase everything, from Settings.

No. Keysprint has no sign-in and no account. Install it and start typing.

Two, both minimal: storage (to keep your stats and settings on your device) and contextMenus (to add the right-click "Practice selected text in Keysprint" item). When you use that menu, Chrome passes the selected text directly to the extension — Keysprint never reads page content on its own. It also requests a single host permission for factory-chrome-extensions.vercel.app, used only to fetch a small display-config that decides whether the optional Support / Go Pro buttons appear.

As you type, Keysprint records how often each key is hit correctly or incorrectly. The Heatmap tab tints every key green→red by your error rate, and Drill mode generates practice words weighted toward your worst keys so you train exactly where it counts.

The standard way: one "word" equals five characters. Your net WPM counts only correctly typed characters over the elapsed time, while "raw" counts everything you typed. Accuracy is correct keystrokes ÷ total keystrokes, and consistency reflects how steady your speed was second to second.