Terms of Use

Last updated: 20 October 2026
Applies to: Lustre for iPhone (App Store ID 6811636658, bundle com.dataconceptstudio.lustre) and Lustre for Android (Google Play, package com.dataconceptstudio.lustre)

These Terms of Use ("Terms") apply to the app Lustre, for iPhone and for Android (the "App"), published by Data Concept Studio Michał Szarek ("we", "us", "our"). By downloading or using the App, you agree to these Terms.

1. Store terms

• iPhone: Lustre is licensed to you under Apple's Licensed Application End User License Agreement (the "Standard EULA").
• Android: Lustre is distributed through Google Play, and the Google Play Terms of Service apply to your use of Google Play, including purchases.

These Terms add information specific to Lustre, in particular about the free trial and the purchase. They do not replace the store's terms.

2. Who we are

Lustre is published by Data Concept Studio Michał Szarek, a sole proprietorship (jednoosobowa działalność gospodarcza) registered in Poland and based in Kraków, Poland. Contact: contact@dataconceptstudio.com.

3. What Lustre is

Lustre turns your screen into an adjustable light for your face and shows a mirrored preview from the front camera, with a warmth and brightness dial, built-in presets (Daylight, Evening, Office, Golden Hour and Max), custom presets, layouts (mirror on top, mirror below, full screen, and on foldable phones held half-open the mirror on one side of the fold and the controls on the other), a symmetry grid, zoom, pause and photo capture.

• Not a medical or cosmetic device. Lustre is a screen showing light and a camera preview. It does not diagnose, treat or assess anything.
• Suggestions, not measurements. Preset warmth describes how the light looks. The room preset suggestion (iPhone only) is based on the camera's own white-balance estimate, and the face-lighting hint only indicates which side of your face, if any, appears darker. Both are suggestions, not measurements.

4. Free trial

• Lustre is a free download. All features are free for 14 days.
• iPhone: the 14 days are counted from the original download date of the App for your Apple ID, as signed by Apple (StoreKit AppTransaction). Deleting and reinstalling the App does not start a new trial.
• Android: Google Play offers no free trial for one-time purchases, so the 14 days are counted on your device from the first time you open the App. Android's backup to your Google account keeps this date when you reinstall on the same account with backup turned on.
• Nothing is charged when the trial ends. You are only charged if you choose to buy the full version.
• After the trial, the mirror, the light and the Daylight preset stay free forever.

5. The full version — a one-time purchase

• The rest of Lustre is unlocked by a single in-app purchase, "Lustre — full version". You pay once.
• It is not a subscription: there is no auto-renewal and no recurring charge.
• The price is shown by Apple or Google in your local currency before you buy. The base price is US $2.99; the local price is set in each store (for example 9,99 zł in Poland).
• The purchase is not enabled for Apple Family Sharing or Google Play Family Library.
• A purchase belongs to the store and account you made it with: buying on iPhone does not unlock Android, and the other way round.
• Restore Purchases is available in Settings and on the purchase screen, for example on a new phone or after reinstalling.
• If the store cannot be reached, a purchase you have already made stays unlocked, and a trial that has already ended stays ended.

6. Payments and refunds

Purchases and payment are handled by Apple or Google under their terms. We cannot issue refunds ourselves. To request a refund on iPhone, use reportaproblem.apple.com; on Android, follow Google Play's refund process.

7. Your content

Your custom presets stay on your device. Photos you take are saved to your own photo library or gallery and are yours. We do not receive them. See the Privacy Policy for details.

8. Using the light comfortably

Lustre can make your screen very bright. Avoid looking directly into the screen at high brightness for long periods, lower the brightness if it is uncomfortable for your eyes, and do not use the App while driving.

9. Acceptable use

Use Lustre in line with the law and the store's terms. Do not attempt to bypass the trial or the purchase, or to copy, modify or redistribute the App except where the law expressly allows it.

10. No additional warranty

Beyond what applicable law requires, the App is provided "as is", without additional warranties. We do not promise that the App will be uninterrupted or error-free. Features may change in later versions.

11. Limitation of liability

To the extent permitted by law, we are not liable for indirect or consequential damages arising from your use of the App. Nothing in these Terms limits liability that cannot be limited under applicable law.

12. Changes to these Terms

We may update these Terms from time to time and will revise the "Last updated" date above. Changes do not apply retroactively to a purchase you have already made.

13. Governing law and your consumer rights

These Terms are governed by the laws of Poland. Nothing in these Terms limits the rights you have as a consumer under the mandatory laws of your country of residence.

14. Contact us

Questions about these Terms: contact@dataconceptstudio.com.