Polly (“the app”) is a pollen-allergy companion built by Adam Mierzwa (“we”, “us”). This policy explains what data the app handles and why. We collect the minimum needed to make the app useful, we do not sell data, and we do not run ads.
If iCloud is enabled on your device, your diary and profile sync across your own Apple devices through Apple’s CloudKit service into your personal private iCloud database. We do not have access to this data. You can disable sync in iOS Settings at any time.
Polly requests “When In Use” location permission to fetch the local pollen forecast and air-quality data. Coordinates are requested at roughly 1 km accuracy — not precise GPS — and are sent only to the forecast providers listed below. We do not store a history of your locations on any server.
If you decline location, or prefer a fixed home city, you can set one manually in Profile → Home city. The selected city’s coordinates are stored on your device and sent to the forecast providers in the same way as a device-provided location.
Subscription purchases are handled by Apple’s App Store. We use RevenueCat to verify entitlements (e.g. whether “Polly Pro” is active). RevenueCat receives a random anonymous identifier and your purchase receipt — it does not receive your Apple ID, email, or name. See RevenueCat’s privacy policy.
Polly uses PostHog, a privacy-focused product analytics service, hosted in the EU, to help us understand how the app is used and where to improve it. We send:
We do not send your display name, your free-text diary notes, your precise coordinates, your Apple ID, or any direct identifier. PostHog does not perform cross-app or cross-site tracking. Polly contains no advertising SDKs. See PostHog’s privacy policy.
If you open the in-app feedback sheet, it loads a web form hosted at mierzwa.net. Your anonymous PostHog identifier is passed as a query parameter so that feature votes and submissions can be attributed to the same anonymous person across the app and the web form. Only content you actively submit (feature suggestions, votes, or private messages you write) is saved.
Polly is not directed at children under 13 and does not knowingly collect data from them.
All diary and profile data lives on your device or in your iCloud account. To delete it, remove the app from your device and delete its iCloud data in iOS Settings → Apple ID → iCloud → Manage Storage. We have nothing to delete on our side because we do not store diary data on our servers. If you would like your anonymous PostHog analytics identifier deleted or any feedback you submitted removed, email us at the address below and we will action it.
If we make material changes, we will update the “Last updated” date above and, where appropriate, surface a notice inside the app.
Questions: privacy@mierzwa.net