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AppFactory Studio

Privacy Policy

Decibly — Decibel & Sound Meter

Effective: 2 October 2026 · 한국어

1. What we collect

We collect and keep no personal data ourselves. There is no sign-up, no login and no account. The only thing the app sends to our server is the anonymous usage events described below, which contain no personal data. The advertising SDKs bundled in the app do collect data in order to serve ads (see section 4).

• Audio is never recorded, saved or uploaded. While you measure, the microphone signal is turned into sound levels (dB) in your device's memory and immediately discarded. No audio file is ever written, and audio never leaves the device.
• The microphone is used only while you are measuring with the app on screen. Measuring stops when the app leaves the screen; there is no background measuring.
• A session is saved only when you tap "Save": it stores numbers only (time, sound levels per second, Min/Leq/Max/Peak, weighting, response, calibration offset) plus the name and note you type, in the app's private storage.
• "Export CSV" writes a text file of those numbers and hands it only to the app you choose (share) or to the file location you pick (save). Temporary export files are cleaned up after a day.
• The calibration offset is saved on the device together with your phone's model name, so the right offset is applied on that model. It is never sent anywhere.
• The app is excluded from Android's automatic backup.
• The advertising identifier (GAID) is used by the ad SDKs. Our own app code neither reads nor stores it.
• Anonymous usage events — the app sends a small, fixed set of anonymous events (first launch, first reading, the "Remove ads" screen being shown and where it was opened from (Settings or next to the banner), purchase started, completed, cancelled or failed (with a technical failure reason), restore attempted, an interstitial ad being shown, and whether the app was reopened on day 1 and day 7) to a server we operate. Each event carries only an install identifier the app generates at random, an app tag, the event name and a timestamp; no advertising ID, device identifier, name, sound level or audio is included. We use it solely to see where people drop off, and raw events are deleted within 90 days, leaving only aggregate counts.
• Counters such as microphone allowed, first session saved, CSV exported, calibration set, weighting changed and alert set are numbers on your device and are never transmitted anywhere.
• There is no third-party analytics or crash-reporting SDK in the app.

2. Where data lives

Data	Purpose	Location
Microphone signal	Calculating the sound level	Device memory only — never recorded or stored
Current measurement (levels, graph)	Showing the reading	Device memory until you save or reset
Saved sessions (numbers, name, note)	History, graph, CSV export	App private storage
Calibration offset (per phone model)	Applying your calibration	On device
App settings (weighting, response, alert threshold, screen on, auto start, theme)	Running the app	On device
Whether "Remove ads" was purchased	Unlocking and restoring the purchase	On device + Google Play
On-device usage counters	In-app decisions (e.g. when to ask for a review)	On device — never sent
Anonymous usage events (random install identifier only)	Seeing where people drop off	Our server — raw events for up to 90 days, then aggregates only

3. App permissions

Permission	Used for
Microphone (record audio)	Measuring the sound level while you measure on screen. Requested when you first tap Start. Audio is never recorded.
Vibration	The noise alert, when you turn it on
Internet, network state	Showing ads, in-app purchase, sending anonymous usage events

Saving a CSV file uses the Android file picker, so no storage or media permission is needed.

4. Third-Party Services

Google Play Billing — in-app purchases are processed by Google, and the app only checks whether you own an item. We never see your payment details. Google's handling is covered by the Google Privacy Policy.

Unity LevelPlay & Unity Ads (Unity Technologies / ironSource) — to serve banner and interstitial ads via mediation, it collects and uses the advertising identifier (GAID), IP address, device information (model, OS version, language, etc.) and ad-interaction data, which may be passed to advertising partners during ad bidding. Unity's handling is covered by the Unity Privacy Policy, and you can opt out of personalized ads via the information icon shown on ads. Microphone audio and sound-level readings are never passed to the ad SDKs.

Ad mediation partners — ads are selected through Unity LevelPlay mediation, which runs a real-time auction among the networks below. Each network's SDK is included in the app and, when it takes part in an auction, may process the advertising identifier (GAID), IP address (used to estimate an approximate region), device information, ad-interaction data and SDK diagnostic/crash information for ad delivery, measurement and fraud prevention. Each partner's handling is covered by its own policy:

Partner	Privacy policy
Unity LevelPlay · Unity Ads · ironSource Ads (Unity Technologies)	unity.com
Liftoff Monetize (Vungle)	liftoff.io
Mintegral	www.mintegral.com
Pangle (ByteDance)	www.pangleglobal.com
AppLovin	www.applovin.com
Meta Audience Network	www.facebook.com
DT Exchange (Digital Turbine)	www.digitalturbine.com
InMobi	www.inmobi.com
Moloco	www.moloco.com

5. Consent in Europe (GDPR / EEA, UK, Switzerland)

On devices that appear to be in the EEA, the UK or Switzerland, the app shows the InMobi Choice consent dialog (CMP) the first time an ad space (on the measuring or history screen) is shown. It follows the IAB TCF standard.

• If you do not consent, or you dismiss the dialog, the ad SDKs are not initialised at all — no ad request is sent. Measuring works the same either way.
• You can reopen it and withdraw consent any time from Settings → "Privacy choices". After withdrawal, any already-loaded ad is discarded rather than shown.
• Outside those regions the dialog does not appear; you can still limit personalised ads by resetting or deleting the advertising ID in your device settings.

6. International transfers

We transfer no personal data ourselves. The anonymous usage events in section 1 are processed on Cloudflare infrastructure (which may be located abroad) and contain no personal data. The advertising partners listed in section 4 may process data on servers abroad (including the United States) while serving ads, under their own policies. In Europe this only happens after the consent described in section 5.

7. Ad formats

• The app shows banner and interstitial ads. There are no rewarded ads.
• Banners appear only on the measuring and history screens, in a separate strip below the controls; they never cover the reading or the buttons.
• Interstitials never appear while you are measuring. They can appear only when you return to the measuring screen after closing a saved session (the save sheet or a session's details), with measuring stopped, at most every second time, never in the first session after install, and at least 180 seconds apart. They never appear at launch, during a permission request, while exporting or on the calibration screen.
• The one-time in-app purchase "Remove ads" removes all of them. No measuring feature is locked.

8. Children

This app is for a general audience and is not directed at children under 13.

9. Your rights

• Change or withdraw ad consent — Settings → Privacy choices (devices in Europe).
• Reset or delete the advertising ID — device Settings → Privacy → Ads.
• Revoke microphone access — device Settings → Apps → Decibly → Permissions.
• Delete a session — open it in History and delete it. Delete everything — removing the app erases all saved sessions, settings and calibration. CSV files you exported or shared are yours and stay wherever you saved them.
• Questions — email us at the address below.

10. Contact

Email: leehywo@gmail.com

Privacy contact: AppFactory Studio Privacy  |  leehywo@gmail.com

11. Change history

Date	Change
2026-10-02	First published (launch preparation)