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Privacy Policy

Last updated: 10 August 2026

Reef Stability is built to keep your data yours. This policy explains what the app and this website do — and, mostly, what they don't.

The app

No account, no sign-up. You don't create an account to use Reef Stability, and we don't ask for your name, email, or any personal identifier.
Your data stays on your device. Everything you log — tanks, tests, doses, events — is stored locally on your iPhone. We can't see it, because it never reaches us.
No advertising or cross-app tracking. Reef Stability contains no advertising or third-party tracking SDKs. The only external service in the app is RevenueCat, used solely to manage your Premium purchase.
Purchases and subscriptions. If you buy Reef Stability Premium, the purchase is processed by Apple through the App Store — we never see your card or payment details. We use RevenueCat to manage your subscription status and to see anonymized subscription metrics (like how many people subscribe or cancel). RevenueCat receives your App Store purchase information and a random, app-generated identifier — never your name, email, or your reef data.
No data selling, ever. We do not sell, rent, or share your data. There is nothing to sell.

Cookieless analytics. We use Cloudflare Web Analytics to count visits and see which pages are useful. It uses no cookies, does not fingerprint you, and does not collect personal data or track you across sites.
No advertising, no cross-site tracking.
If you email us, we receive your email address and message so we can reply — nothing more.

Reef Stability is not directed at children under 13 (or the equivalent age in your country) and does not knowingly collect data from them.

If this policy changes, we'll update the date above. Material changes will be noted in the app or on this site.

Questions about privacy? Email support@reefstability.com.