Night Window – Privacy Policy

Last updated: October 2026

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Thank you for using Night Window (眠窗, "the app"). We take your privacy seriously. This policy explains what information the app handles and how.

Do I need an account?

No. All core features — playing sleep sounds, switching scenes, timers, mixes — work without signing up or logging in. Your settings are stored only on your device and are not uploaded to any server.

Current version: sign-in / account features (described under "If you choose to sign in" and "Deleting your account" below) are still in development and are not available in the app yet. You will not find a sign-in option and will never be asked to sign in. We publish these rules now so they are available from day one when the feature launches, and we will update this note at that time.

Information stored only on your device

The following stays on your phone and is never sent to us:

• Your settings, saved sound mixes, sleep timer and wake-alarm settings;
• Your listening log and streaks (used for features such as the annual sleep summary);
• Your Diamond theme choice (Diamond members);
• Custom sleep sounds: if you add your own audio file, it is stored inside the app on your device only. It is never uploaded.

Uninstalling the app deletes this data.

If you choose to sign in (future feature)

We will only collect the minimum needed to confirm it is you. We will never ask for an ID card, face scan or other government-issued documents.

• Email address or phone number (at least one) — to send you a verification code;
• If you sign in with Google, Apple, Facebook, LINE or WeChat, we only receive an opaque identifier from that platform. We do not read your real name, photo or contacts;
• Usage data you create in the app (membership expiry, saved mixes, streaks) so it can be restored on a new device.

If you are a Diamond member and use the "Wish list" feature, your request is sent as a normal email from your own email app to our Diamond support address. We only use it to decide which sounds or scenes to build next.

Purchases and payment information

Payments are completed inside Google Play or the App Store (or another payment provider where available). The app never sees your card number or payment password. We only receive confirmation that an order succeeded (order ID, product, amount, time) so we can unlock your membership.

Third-party services

• Google Play Billing / Apple App Store — process your payment and subscription.
• RevenueCat (privacy policy) — verifies your store purchases and tracks your membership status. RevenueCat processes order information (product, order ID, amount, expiry), an anonymous identifier generated by RevenueCat and linked to your store account, and technical information such as device model, OS version and app version. RevenueCat does not receive your name, email or card number.
• Firebase (by Google, privacy policy) — we use Firebase cloud functions and database to receive purchase events from RevenueCat and keep a membership record, so you can restore your membership after reinstalling or changing devices, and so we can check "I paid but membership isn't showing" support requests. We also keep the raw purchase event records RevenueCat sends (which may include order ID, product ID, amount, currency, store and country/region) as evidence for support and accounting. This data is kept in our own Firebase project and is never used for advertising or profiling. Google Cloud may log technical request information such as IP addresses by default; we do not use it to identify you.
• GitHub (privacy statement) — some scene videos are not bundled in the app; they are downloaded from GitHub's servers the first time you open that scene, then cached on your device. As with any web download, GitHub receives standard technical information such as your IP address. We do not receive this information.

The app contains no advertising SDKs and no analytics or tracking tools (such as Google Analytics). If this ever changes, we will update this policy and the Google Play Data safety form at the same time.

Permissions

• Notifications — for bedtime reminders, the gentle wake alarm, renewal reminders, and the silent "playing" notification shown while sounds play in the background. You can turn these off at any time in your phone settings.
• Background playback (foreground service and keeping the device awake during playback) — so sounds keep playing smoothly when the screen is locked or you switch apps. It stops when you stop playback.
• Internet — to verify purchases and download scene videos.

The app does not request access to your location, contacts, camera, microphone or photos.

Your rights

Wherever you live, you can contact us to ask what personal information we hold about you, or to have it corrected or deleted. If you are in the EU, UK or EEA, you also have the right to data portability, to object to processing, and to withdraw consent at any time (this does not affect processing that happened before withdrawal). We will respond within a reasonable time.

Deleting your account (once accounts are available)

You will be able to request account deletion in Account settings at any time. We will delete your email/phone number and sign-in identifiers within a reasonable time. Transaction records we are legally required to keep (such as purchase receipts) are kept only for the minimum period required by law and then deleted. Deleting your account does not affect purchase records held by Apple or Google under your store account.

Children

The app is not directed at children under 13, and we do not knowingly collect personal information from children.

Changes to this policy

We may update this policy from time to time. The updated version will be posted on this page.

Contact us

Questions about this policy? Email lugmanmyj2011dxb@gmail.com.