Privacy.
Short version: we don't sell your data. We don't have any yet beyond what's described below.
The tools run in your browser. Your quit date, your recent template picks, and your draft form inputs are saved in your browser so the page survives a refresh. None of that ever leaves your device.
What we measure. Page views and basic country/device breakdowns. No cookies. No IP storage. No profile of you across visits. That's the entire measurement.
Email signup. If you drop your email on the About page, we store it along with the exact promise you saw at signup. We use it to send you one heads-up when the next thing is ready. After that, you choose to stay on the list or get deleted automatically. The About page has the full lifecycle.
A full policy will be live before any signup is. Until then, the above is what the site is doing.