← Dive Tools

Privacy Policy

Last updated: 2026-06-01

Summary

Dive Tools collects no personal data and has no backend that stores your dive data. Everything you enter stays on your device in the browser's localStorage. No accounts, no third-party trackers — only anonymous, aggregated usage statistics with no cookies and nothing stored on your device.

What we store

All your settings and data are stored locally in your browser on your device: theme and language, deco planner settings, custom checklists, gas prices and presets, module order, dismissed banners. This data never leaves your device. Clearing your browser storage or uninstalling the PWA removes everything.

Third parties

Anonymous usage analytics

To understand which features are useful and how many people use the app, we collect privacy-friendly, anonymous usage statistics through Cloudflare (our hosting provider's Workers Analytics Engine — no third-party analytics service such as Google Analytics, Plausible, or Mixpanel is involved). We record events such as which calculator you open or when a deco plan is generated, along with your language, unit system, coarse country (derived from your IP, which is not stored), and the website that referred you. To count unique visitors per day without identifying anyone, the server derives a daily-rotating hash that changes every day and is never stored — so we set no cookies, store nothing on your device, and cannot recognize you across days or across other websites. We never collect personal data or build advertising profiles. We honor your browser's Do-Not-Track setting, which switches this off entirely.

Your GDPR rights

Because we don't store your data, most GDPR rights are automatically satisfied:

Contact

Questions or concerns: radim.pelanek@gmail.com

Changes

We may update this policy if the app changes materially (e.g. adds a backend or analytics). Significant changes will be announced in the in-app "What's New" modal.