Effective July 11, 2026
Nothing. The app has no accounts, no analytics, no ads, no tracking, and no third-party SDKs. It makes no network requests. We never see your data — we couldn't even if we wanted to.
Everything you enter — pool and hot tub profiles, volumes, test readings, notes — is stored locally on your device using Apple's on-device database. Nothing is uploaded anywhere.
Chemical amounts are computed entirely on your device from the numbers you enter. Nothing about your water, your equipment, or your habits leaves your phone.
Test reminders are local notifications scheduled on your device by iOS. No server is involved, and the app only asks for notification permission if you turn a reminder cadence on.
When you export your test log to a CSV file, you decide where that file goes. The app writes the file and hands it to you; we keep no copy. Importing a CSV reads the file you choose and stores its contents on your device, same as tests you log by hand.
Your data is deleted with it. If you want to keep your test history, export a CSV first — that file is yours forever.
The app does not collect personal information from anyone, including children.
If a future version ever changes how data is handled, this policy will be updated before that version ships, and the app will ask for your explicit consent before any network feature is enabled.
Questions? Email linsizhen@gmail.com or see the support page.