The thirty-second summary

Tsubu is a kawaii blood-type personality app made by Nax Technology Co., Ltd.
The app’s own logic runs entirely offline on your device —
nothing you enter (your blood type, gender, saved people, fortunes you read)
leaves your phone, and we don’t run our own analytics or send you to our
servers.

Tsubu does, however, show advertising through Google AdMob
to keep the app free. AdMob is operated by Google and, like virtually every
ad-supported app, it collects a small set of device-level signals to deliver
ads (see the Advertising section below for the specifics and how to reset
your advertising ID).

What WE (Nax Technology) do NOT collect

None of the following ever reaches our servers, because Tsubu’s own app
logic does not send anything anywhere. (See the Advertising section for
what Google’s AdMob SDK does separately.)

• No name, email address, phone number, or any contact info.
• No precise location or GPS.
• No analytics, crash reports, or telemetry of our own.
• No in-app behaviour logs.
• No photos, files, contacts, or messages.
• No financial information.
• No biometric or precise health data.
• Your blood type and saved people stay only on your device.

What stays on your device

To remember your settings between launches, Tsubu stores a few small
preferences using Android’s standard local storage
(SharedPreferences). This data is read-only by Tsubu, never
uploaded, never shared, and is removed when you uninstall the app.

• Your blood type (A, B, O, or AB) — to personalise readings.
• Your gender — to choose the matching kawaii mascot illustration.
• Your preferred language.
• People you save — names + blood types you add yourself for compatibility lookups.
• An onboarding-completed flag, so the welcome flow only shows once.

The “people you save” list is something you type in. We never
access your phone’s contacts, and the list never leaves your device.

Permissions Tsubu asks for

None beyond the standard ones Android grants to every
app (drawing on the screen, accessing its own storage). Tsubu does not
request location, camera, microphone, contacts, calendar, storage,
Bluetooth, or any other special permission.

Advertising (Google AdMob)

Tsubu is free, supported by ads served through Google AdMob. AdMob is
a third-party service operated by Google. When the SDK fetches an ad,
it is Google — not us — that may process the following:

• Advertising ID (Android Advertising ID / GAID) — a resettable identifier used to limit how often you see the same ad and to measure ad performance.
• IP address — used to derive a coarse location (country / region) and to fight click fraud.
• Device information — model, OS version, language, and similar non-identifying signals that help format the ad.
• Ad interactions — impressions and clicks on ads shown inside Tsubu.

How Google uses this data is governed by Google’s own privacy policy:
policies.google.com/privacy.
A summary of how AdMob in particular handles data is at
AdMob & data collection.

You can reset your advertising ID at any time in
Settings → Privacy → Ads (the exact path varies by device). You can also
enable “Opt out of Ads Personalization” there to stop interest-based ads;
you will still see ads, but they will be non-personalised.

We do not bundle Firebase Analytics, Crashlytics, Facebook SDK,
or any non-AdMob tracker. We do not have access to the data Google
collects through AdMob — Google does.

Children

Tsubu is rated Everyone and is safe for users of all
ages. Because we collect no data of any kind, we do not knowingly or
unknowingly process information from children under 13 (or under 16 in
regions where that is the relevant threshold). COPPA, GDPR-K, and
similar regimes do not apply because there is no data flow.

International transfers

None. No data moves anywhere because no data is collected.

Your rights

Most privacy laws give you the right to access, correct, or delete the
data a company holds about you. Tsubu holds no data about
you, so there is nothing to access, correct, or delete on our
end. You can reset everything Tsubu stores locally by uninstalling the
app or clearing the app’s data in your phone’s Settings.

Changes to this policy

If we ever change what Tsubu collects (for example, if we one day add
a feature that requires a server), we will update this page with a new
effective date and surface the change inside the app. We will not
retroactively start collecting data without telling you.

Contact

Questions? Email [email protected].

Nax Technology Co., Ltd.
naxtech.co