Privacy Policy

Yaoki · Effective 8 September 2026

Yaoki is a step-streak tracker for iPhone and Apple Watch. This policy explains exactly what the app reads, where it is kept, and who can see it.

Yaoki has no servers, no analytics, and no third-party code. Nothing you do in the app is sent to the developer or to anyone else.

What Yaoki reads

With your permission, Yaoki reads the following from Apple Health. All of it is read-only — Yaoki never writes anything back to Health.

Data	Why
Step count	Counts your daily total and decides whether a day extends your streak
Walking + running distance	Shown as today's distance
Exercise minutes	Shown as today's active minutes
Active energy	Shown as today's energy
Flights climbed	Shown as today's flights climbed

On iPhone, the home-screen and lock-screen widgets also use Motion & Fitness (the device's pedometer) to show today's step count without having to wake the app. That reading stays on the device.

Yaoki does not ask for, and cannot see, your location, contacts, photos, microphone, camera, or any health data beyond the types listed above.

Where it is kept

On your device. Your step totals, daily goal, rest days, per-day edits, and app settings are stored in a private container on the device, shared only between Yaoki, its widgets, and its Apple Watch app.

In your own iCloud account. So that your setup survives a new phone, a small amount of data is backed up to Apple's iCloud key-value storage under your own Apple Account:

your daily step goal
which weekdays you have marked as days off
a streak number you have set by hand, if any
your per-day manual edits (rest day, counted, break)

Your step counts and other Health data are deliberately excluded from this backup. Health already stores them, and they are never copied to iCloud by Yaoki.

This backup lives in your iCloud account, not the developer's. The developer has no access to it.

On your Apple Watch. The iPhone sends the watch two numbers — your daily goal and your current streak — so the watch app and complications can display them.

What is never collected

No account, sign-up, or email address is required or requested.
No analytics, telemetry, crash reporting, or usage tracking of any kind.
No advertising, and no advertising identifiers.
No third-party SDKs or services are bundled in the app.
Your data is never sold, shared, or disclosed to data brokers.

Yaoki contains no networking code. It cannot transmit your information anywhere, because it has nowhere to transmit it to.

Health data, specifically

As required by Apple's rules for apps that use HealthKit: health and fitness data read by Yaoki is used solely to display your activity and to calculate your streak inside the app. It is never used for advertising or marketing, never used for data mining, and never disclosed to third parties.

Notifications

The optional reminder ("nudge me if a run is at risk") is generated on your device by iOS and delivered locally. There is no push server, and no notification content is sent over the internet.

Removing your data

Health access: open the Health app → Sharing → Apps → Yaoki, and turn off any category you no longer wish to share. You can also revoke access in Settings → Privacy & Security → Health.
On-device data: deleting Yaoki removes it.
The iCloud backup: delete the app, then turn off iCloud for Yaoki in Settings → your name → iCloud. Because it is stored in your own account, you control it entirely.

Children

Yaoki is not directed at children under 13 and collects no personal information from anyone.

Changes to this policy

If this policy changes, the effective date above will be updated. Material changes will also be noted in the App Store release notes.

Contact

Questions about this policy: appstore@mui.co.jp