Sensory & Focus · 01 Privacy Policy

Last updated: 2026-09-12

i.The short version

VisibleHour does not collect any personal information about you. There is no analytics, no third-party SDKs, no ads, no telemetry. Calendar events are read locally on each device and never leave it. On iPhone, iPad and Apple Vision Pro, your active session, schedule, awareness interval, and appearance preference sync between your own devices through your private iCloud database, encrypted by Apple. On Android, nothing syncs at all: everything stays on the one device. sthreelabs can't see any of it.

ii.What stays on your device

Calendar events. If you grant Calendar access, today's events are read from the system Calendar on each device. They're displayed as small ink arcs on the dial. They are never transmitted off the device. They never sync via iCloud. Each device shows its own local Calendar; events do not cross devices.
Notification history. Awareness taps and session-end notifications stay in the local Notification Center.
Local app preferences. Display preferences, last-used session lengths, and similar are local-only.

iii.What syncs through your private iCloud (Apple devices only)

The Android app has no sync of any kind. It has no account, no server, and no cloud container: your schedule, sessions and settings live only on that phone or tablet, and Android's own backup is the only thing that can copy them to a new device. The rest of this section applies to iPhone, iPad and Apple Vision Pro.

If you're signed into iCloud and have iCloud enabled for VisibleHour, the following state syncs across your Apple devices through Apple's CloudKit private database (encrypted, end-to-end, Apple-managed):

The active session. If a session is running, its start time, duration, and Pomodoro pattern. Cleared when the session ends or is stopped.
Your day schedule. The hours of your waking day (e.g., 9 AM to 10 PM) and any period transitions (Day, Evening, optional Morning).
Your awareness interval. 30 / 60 / 90 / 120 minutes or Off.
Appearance preference. Warm canvas or frosted glass on Apple Vision Pro.

This data is stored only in your private iCloud container. sthreelabs has no servers, no analytics, and no way to read or access this data. Apple cannot decrypt it either; it's end-to-end encrypted under your iCloud keychain.

iv.Third-party services

Apple iCloud (CloudKit private database): your private container, end-to-end encrypted by Apple. apple.com/legal/privacy
Apple EventKit: system Calendar access, opt-in, read locally per device. Apple-managed.
Apple Push Notification service: used by CloudKit for sub-second cross-device sync. Apple-managed.

On Android the list is shorter, because there is no sync: the app uses the system calendar provider (opt-in, read on the device) and the system's own alarms and notifications for awareness taps and session alerts. Nothing else. Google Play handles the purchase and the download, as it does for every app on the store; sthreelabs receives no personal information from it.

No other third-party services are integrated. No analytics SDKs (no Google Analytics, no Firebase, no Mixpanel, no Amplitude, no Segment). No advertising SDKs. No crash-reporting services. The only crashes ever surfaced are through Apple's built-in App Store Connect crash reporting, which is anonymous and Apple-managed.

v.What the app does NOT do

No analytics, no telemetry, no tracking SDKs.
No advertising identifiers.
No location, microphone, camera, contacts, photos, or health-data access.
No account registration. There is no VisibleHour account, no login, no sign-in.
No cross-app fingerprinting.
No data brokerage or third-party sharing.
No social features. No sharing. No public feed.

vi.Children's privacy

The app is intended for general audiences and does not knowingly collect any data from anyone, including children under 13.

vii.Deleting your data

On Apple devices: delete the app on every device, then delete the CloudKit container's data via Settings → [your name] → iCloud → Manage Account Storage → VisibleHour → Delete Data. Calendar permission can be revoked at any time in Settings → Privacy & Security → Calendars.

On Android: uninstalling the app removes everything it stored, since none of it leaves the device. Calendar and notification permissions can be revoked at any time in Settings → Apps → VisibleHour → Permissions.

viii.Changes to this policy

If this policy changes in any material way, the "Last updated" date above will change and the new policy will be posted on this page.

ix.Contact

Questions about this policy or the app: hello [at] sthreelabs [dot] com

Made quietly by sthreelabs.