Privacy Policy — Uyu

Last updated: 27 October 2026

The short version

Uyu is made by Orkun Aybek, a sole proprietorship (şahıs şirketi) registered in Türkiye (“we”), who is responsible for this policy.

Uyu doesn’t have accounts, doesn’t track you, and keeps your mixes and settings privately on your own device. The only thing that leaves it is anonymous usage statistics and crash reports, sent to PostHog, with no name or advertising identifier, and a switch in Settings turns them off. There’s nothing to sell, because there’s nothing that says who you are.

What Uyu stores, and where

Everything Uyu remembers about you — your saved sound mixes, your favorited sounds, your selected language, your recently played sound combinations, a simple daily-use streak (never shared or shown to anyone but you), your “play alongside other audio” preference, and a small counter used only to decide when to show you an App Store review prompt — is stored locally on your device, using standard iOS/Android app storage. None of it is sent to us, because we don’t operate any server that could receive it. Uninstalling the app deletes all of it.

We do not collect, and Uyu does not ask for:

• Your name, email address, or any other personal identifier
• An account, login, or password of any kind
• Your location, precise or approximate
• Your contacts, photos, or camera
• Your microphone (Uyu’s audio permission request is disabled — the app does not, and cannot, listen to anything)
• Any advertising identifier

Analytics

Uyu uses PostHog, a product analytics service from PostHog, Inc., to count how the app is used so we can improve it. That covers:

• which sounds and ready-made mixes you play, and for how long you listen each time, with what ended it (the sleep timer, a pause, starting over, headphones coming out, a call or other audio interrupting, or the app being closed);
• whether a sleep timer was set, and whether it ran to the end;
• how the app’s features get used: building or editing a mix (which sounds were added or taken out, and how the builder was closed), Surprise me, Undo, removing a sound, tones, sharing and opening a mix link, and the settings switches;
• the app being installed, updated, opened, brought back and put in the background, so we can count how many people use it from one day to the next;
• playback problems the app ran into, such as a sound that could not load or one that stopped and was restarted.

Each event is a short name with a few simple details: Uyu’s own names for its sounds and ready-made mixes, counts (such as how many sounds were in a mix), how many minutes, and which of a fixed set of choices applied. The names you give your mixes, what you type into search and the link a mix arrived by never leave your device. Each event is tied to an anonymous install ID: a random number that PostHog’s software creates on your device and that cannot be traced back to you. There is no name, no account, no advertising identifier and no audio in any of it, and it is not used for advertising. Uyu does not record your screen, your taps or which screens you visit.

Each event also carries some technical details: your device’s manufacturer, model and screen size, its operating system and version, the app’s version, whether the app is running on a simulator, your language and time zone, and a random session ID that groups together the events from one use of the app.

PostHog receives the IP address the data comes from, as any internet service does. We have set PostHog not to store that address and not to work out your location from it. The data is processed by PostHog, Inc. in the United States.

The “Share usage statistics and crash reports” switch in Settings turns this off. If it is off when Uyu opens, Uyu doesn’t start PostHog at all and sends nothing. If you switch it off while using the app, events from the last few seconds that were already waiting to be sent may still go out; nothing after that does, and nothing about listening that was going on while it was off is sent later. When Uyu is closed while a mix is playing, how long you had been listening is kept on your device and sent the next time you open the app, and only if the switch is on then.

Crash reports

Uyu also uses PostHog to find out when the app crashes or runs into an error, so we can fix it. When that happens, a report is sent containing the error, where in Uyu’s code it happened (the stack trace), a short note we wrote about what the app was doing (such as “play a sound”), and the same technical details and anonymous install ID as above. A crash in the app’s native code is sent the next time you open the app, and also says whether the device was on Wi-Fi or mobile data and whether the app came from the App Store or a test build. It contains no name, no account, no advertising ID and no audio, and it is not used for advertising.

The same “Share usage statistics and crash reports” switch in Settings turns crash reports off, with two limits worth knowing. A report already waiting to be sent when you switch it off may still go out. And if Uyu crashes later in the same session in which you switched it off, a record of that crash stays on your device; it is sent only if you switch sharing back on later.

In-app purchases

Uyu is a one-time paid download with no in-app purchases. The App Store handles the payment; we never see your name, card or Apple Account. The app includes the RevenueCat SDK, which we may activate in the future to offer optional purchases. If and when that happens, RevenueCat may collect a device identifier and purchase information as needed to process transactions and restore purchases across your devices, in accordance with RevenueCat’s own privacy policy. We will update this policy before turning that on.

Third parties

We don’t sell or rent any information, and we don’t share it for advertising. Two outside services are part of the app:

• PostHog (PostHog, Inc., United States) receives the anonymous usage events and crash reports described above and processes them in the United States. It acts as our processor, handling that data only to provide its analytics and error-tracking services to us, under PostHog’s privacy policy. Both stop when you turn off the Settings switch.
• RevenueCat (see above), which is currently inactive.

Children’s privacy

Uyu is not directed at children and does not knowingly collect any information from anyone, including children, since it doesn’t collect personal information from anyone at all.

Changes to this policy

If what Uyu collects or does ever changes — for example, if we add an account system or activate purchases — we’ll update this page and change the “Last updated” date above.

Contact

Questions about this policy: support@uyumix.com