PRIVACY POLICY — LUX LIGHT METER
Effective date: October 24, 2026
App: Lux Light Meter (com.tahatec.light_meter)
Developer: Tahatec
Contact:
support@tahatec.com
SUMMARY
Lux Light Meter reads your phone's ambient light sensor and shows the
illuminance on screen. The app has no accounts, no sign-in and no servers of
its own: the light values you measure, the readings you save and the labels
you give them stay on your device and are never uploaded, stored or shared by
us. The network is used only for advertising, for the optional push
notifications, and for the anonymous usage and crash reports described below.
1. INFORMATION THE APP READS ON YOUR DEVICE
- Ambient light level (lux) from the device's light sensor, while the meter
is running. No permission is needed for this sensor. The values are shown,
smoothed and summarised (minimum, average, maximum) on the device only.
- The sensor's own description (name, range, resolution), shown on the
Settings screen so you know what your phone can measure.
The app does not use the camera, the microphone or your location.
2. INFORMATION THE APP STORES
Only on your device: the readings you choose to save (value, time, optional
label), your calibration factor, and your preferences (unit, theme, language,
keep-screen-on, notification choice). Exporting or sharing readings is always
started by you and goes through the apps you choose; we never receive a copy.
Uninstalling the app deletes everything it stored.
3. ADVERTISING
The app shows ads served by Google AdMob, which may also use certified
mediation partners such as Meta Audience Network. When requesting and
showing ads, these partners may collect and process data on their own
behalf, such as your advertising ID, IP address, coarse location derived
from it, and device and diagnostic information. This is standard for
ad-supported apps and is governed by the partners' own policies:
- Google:
https://policies.google.com/technologies/partner-sites
- Meta Audience Network:
https://www.facebook.com/about/privacy
In the European Economic Area, the United Kingdom and other regulated
regions, the app shows a consent form (Google's User Messaging Platform)
before any ad request is made, and you can change your choice at any time
under Settings → Privacy options inside the app. You can also reset your
advertising ID or opt out of ad personalisation in your device's Google
settings.
4. USAGE ANALYTICS AND CRASH REPORTS
The app uses Google Firebase Analytics and Firebase Crashlytics to learn
which features are used (for example that a reading was saved or the unit
was changed) and to receive reports when the app crashes. These reports
contain device and app information (model, OS version, app version, a
random installation identifier) but never a light value, a reading, a label
or anything you typed. Firebase's handling of this data is described at
https://firebase.google.com/support/privacy.
5. PUSH NOTIFICATIONS
If you allow notifications, the app registers with Firebase Cloud Messaging
so we can send occasional tips and update announcements. Registration
creates a device token held by Google; it is not linked to your identity and
we store no list of recipients. You can turn notifications off at any time
in your device's app settings. The prompt is shown only after you first
save a reading, never on launch.
6. PERMISSIONS AT A GLANCE
- Internet: used by the advertising, consent form, analytics and
notifications described above. The app itself sends none of your
measurements anywhere.
- Notifications (Android 13 and later): requested only if you choose to
enable notifications.
- Keep screen on (wake lock): keeps the display awake while a measurement is
running, if you leave that setting on.
7. CHILDREN
The app is a measurement utility, is not directed at children under 13, and
we knowingly collect no personal information from anyone, including children.
8. DATA DELETION
We hold no data about you, so there is nothing for us to delete: uninstalling
the app removes everything it stored on your device. Analytics and crash
data are held by Firebase under the policy linked in section 4, and
advertising data by the partners in section 3.
9. CHANGES TO THIS POLICY
If this policy changes, the updated version will be published at the same
address with a new effective date. Material changes will be reflected in the
app's store listing.
10. CONTACT
Questions about this policy or the app:
support@tahatec.com