Isoline Privacy Policy

Your health data stays on your iPhone and Apple Watch. Isoline has no account and no server for your data. Coordinates leave your device only to look up altitudes on the Altitude tab.

Who we are

Isoline is an altitude sickness check-in app made by xing wang (AirDraw). Contact: support@airdraw.net.

Health data

With your permission, Isoline reads blood oxygen, heart rate, resting heart rate, heart rate variability, respiratory rate and sleep from the Health app to compare you with your sea-level baseline and to remind you when your blood oxygen is too low.

This data is read and processed only on your iPhone and Apple Watch. It is not uploaded, not stored in iCloud, not used for advertising and not shared with anyone. Isoline does not write any data to the Health app.

Location

Isoline uses your location and the barometer to know your altitude and to tell you when you reach high altitude. With “Always” access, it checks in the background when your location changes significantly.

Location is not uploaded and your route is not recorded. Your current place name is looked up through Apple’s map service when you open the app.

Altitude lookup

When you search a place or look up altitudes along a route on the Altitude tab, the search, the driving route and the town names along it come from Apple’s map service.

To get altitudes, the app sends the coordinates of that place or of points along the route to Open-Meteo (open-meteo.com), a free elevation service. If you start from “My Location”, this includes points near where you are. Only coordinates are sent, with no account, name or device ID, and Isoline does not keep them anywhere off your device. Places you looked up are kept on your device as “Recent”.

Your records

Check-ins, places you looked up, your emergency contact and your settings are stored only on your device. Your iPhone and Apple Watch exchange check-ins directly through Apple’s WatchConnectivity. Messages to your emergency contact are written in Apple’s Messages app and only sent if you send them. Share images are made on your device and only leave it if you share them.

Diagnostics

To find and fix problems, the app sends technical logs to our log service (Alibaba Cloud Log Service, Shanghai): app events and errors, device model, system and app version, and a random ID created at install. These logs never include health readings, location, place names or contacts. They are kept for 90 days and are not used to identify you or for advertising.

Website visits

Only when you visit this website (isoline.airdraw.net), we record the pages you view, buttons you click (such as download, language and each step of the watch demo), the referring site, browser and device type, IP address and the approximate region it indicates, a random visitor ID stored in your browser, and a replay of page interactions (scrolling, clicks and mouse movement). We use this to understand how the website is used, improve it and fix page errors. It is not sold or used for ads.

The check-in demo on the website runs only in your browser; the symptoms and SpO₂ you pick are not saved or sent. Page interaction replays are kept for 30 days. Page views and clicks, and a summary of each visit (referring site, device type, IP address and approximate region), are kept long term to see how the website is used over time. Records of page script errors are kept for 90 days.

Deleting your data

Go to Settings → Delete All Data in Isoline, or delete the app. Data in the Health app is not affected; manage it in the Health app.

Children

Isoline is not directed to children under 13 and does not knowingly collect their information.

For reference only

Isoline is not a medical device. Its results and readings are for reference and do not replace a doctor’s diagnosis.

Changes

If this policy changes, we will update this page and the date above.