SnapshotWatt · Privacy

Privacy Policy

Last updated：2026-11-03

SnapshotWatt (the iPhone app, widgets, Live Activities and the Mac app, “the App”) is developed by CompoundWater. This policy explains what data the App handles, where it is stored and how you can delete it.

In short: the App needs no account, collects no personal data, does not track you and shows no ads. All charge records stay on your own device. We can’t see them.

1. Data the App handles

Data	Where it’s stored	Why
Battery level, charging state, thermal state (on Mac also battery voltage, current, adapter power and cycle count)	Read live on your device only	To estimate and show charging watts
Charge records (time, level change, power curve) and the names you give chargers and cables	On your device only	Records, analysis, rankings and estimates
The battery health and cycle count you enter, app settings	On your device only	Watt calculation, reminders, preferences

This data is never uploaded to any server and is not shared with us or any third party.

2. Network connections

The App only makes these connections, none of which include your personal data or charge records:

Battery capacity table: on launch the App downloads a public file of official iPhone battery capacities from compoundwater.app, so new models work without an app update.
Icons of our other apps: “More apps from us” in Settings loads icons from Apple and compoundwater.app.
In-app purchases: when you buy SnapshotWatt Pro or leave a tip, Apple handles the payment. We never receive your payment details, Apple ID or name. The App only asks the App Store whether this Apple ID owns Pro, and keeps the result on your device.
External links you tap (such as the App Store or our website) open in Safari and are governed by those sites’ own policies.

Any network connection reveals your IP address to the server, which is how the internet works. Our website is hosted by Vercel; we do not use this to identify you.

3. Permissions

Notifications: used only if you turn on charge reminders or the monthly battery health reminder. Notifications are scheduled locally on the device.
Photos (add only): used only when you tap “Save to Photos” to save a share card. The App cannot read your photo library.
Live Activities: show watts on the Dynamic Island and Lock Screen. You can turn this off in Settings.

4. Tracking and ads

The App has no ads, no analytics SDKs and no cookies, and does no cross-app or cross-site tracking.

5. Deleting your data

One record: open it in Records and delete it.
All records: Settings › Records › Delete all records. You can also auto-delete records older than one year or six months.
Deleting the App removes all of its data from your device.

Since your data only exists on your device, we hold no data about you to delete or provide.

6. Children’s privacy

The App collects no personal data from anyone, including children under 13.

7. Changes

If this policy changes, we will update the date at the top of this page. If we ever add any data collection, we will say so clearly in the app’s release notes and on this page.

8. Contact

Questions about privacy: contact@compoundwater.app