1Who we are
Chromweir is an Android app by Zydeno that sets generative prints as a live wallpaper and saves still pictures of them. Contact [email protected] about this policy or your privacy. This policy covers the Android app only. It does not cover Google Play, Android’s wallpaper picker, your home-screen or lock-screen app, your browser, your e-mail app, a document or cloud provider you choose in the Android file picker, or any app you share a file with; each of them has its own policy.
Developer identity. Zydeno is the developer name under which Chromweir is published on Google Play, as shown on the app’s store listing. For the purposes of data-protection law, the developer is responsible (the “controller”) for the limited personal data described in this policy that actually reaches us, such as e-mails you send us. Data that stays on your device is under your control.
2Scope and current version
This policy describes Chromweir version 1.0 for Android as reviewed on 29 October 2026. The current version works fully offline. It has no user accounts, no ads, no in-app purchases, no analytics, no advertising identifiers and no third-party crash-reporting or tracking SDKs. The app does not connect to a Zydeno server or to any other server.
3What we do not collect
We, the developer, do not receive anything you create or choose in the app. Through the app we do not collect, store on a server, sell or share your prints, colours, pictures, design files, the city or coordinates you choose, touches on the wallpaper, usage events, device identifiers, advertising ID, contacts, precise or approximate location, photos, microphone audio, sensor readings or device diagnostics. Nothing is used for advertising or profiling.
A city or coordinates you choose for Daylight could say where you live or travel. They stay on your device under your control, as described below; we simply never receive them.
4What stays on your device
Chromweir keeps the following in the app’s private storage on your phone, which other apps cannot read:
- Your prints: the prints you save in Yours with their names, colours, pace and other settings, the draft you are editing, recent variations and undo steps, and the print set on your home screen and lock screen.
- Wallpaper state: the point the moving wallpaper has reached, so that it continues smoothly after the phone restarts, and the choices for motion, battery and smoothness, home-screen swipes and the calm area for icons.
- Daylight: the light mode you choose and, if you use it, a city from the built-in list or the latitude and longitude you type.
- Settings: language, theme, time format, reduce motion, sounds and haptics, and whether you have finished the introduction.
To choose sensible regional defaults, such as 12- or 24-hour time, the app may read the country code of your SIM card or mobile network, falling back to the device region, and it uses the phone’s time zone to suggest a nearby city from its built-in list. This needs no permission; it does not read your phone number, precise position or cell identifiers, and the values are used only on the device.
These records remain until you change or delete them, clear the app’s storage or uninstall the app. They are not transmitted to us.
5Offline operation and external links
The app does not request Android’s INTERNET or network-state permission and contains no network code. Prints, pictures, sunrise and sunset times and the world map in Globe prints are all calculated on the phone from data packaged with the app. Nothing is fetched from or reported to a server.
The Privacy Policy and Terms of Use links in the app open these pages in your browser only when you tap them; the browser then contacts zydeno.com under its own settings, and the website host may log technical data such as your IP address as any website does. The support link opens your e-mail app with our address filled in; nothing is sent unless you send the e-mail yourself, and no data from the app is attached. Android and Google Play may, as part of the operating system, update the app or system components under Google’s own terms; that is not done by Chromweir.
6Backups, design files, pictures and sharing
Chromweir has no storage or photos permission. Saving and opening files goes through Android’s system file picker (the Storage Access Framework), which gives the app access only to the single file you pick, at the moment you pick it:
- Backup (Settings → Your data → Export): one file with your saved prints and settings, saved where you choose. Import replaces the current data with a backup you pick; the previous data is kept privately for a short Undo and then removed.
- Design file (Export design): a small file that describes one print, saved where you choose. Importing a design file always adds a copy and never replaces anything in your collection.
- Still picture (Save picture): a PNG image of a moment of a print, saved where you choose. The file contains the image only, with no embedded text, location or other metadata.
- Share design: the app writes a temporary design file to its private cache and hands it to the Android share sheet; the app you choose receives that file only.
- Opening files from other apps: when you open or share a Chromweir design or backup file from another app, Chromweir reads that file only, checks it and shows what it would add or change.
These files are not encrypted. If you choose a cloud-backed location in the picker (for example a cloud drive) or share with another app, that provider or app receives the file under its own terms. That is a transfer you start and control, not a transfer to Zydeno. Protect the place where you keep backups.
7Permissions, the wallpaper service and backup
Chromweir requests no runtime permissions: no location, camera, microphone, contacts, photos, notifications, phone or storage permission. Its manifest lists two install-time permissions:
- Set wallpaper (SET_WALLPAPER): lets the app put a still picture on your lock screen when you ask it to. It gives the app no access to your existing wallpapers or photos.
- An app-internal signature permission that Android libraries use to protect the app’s own components; it gives access to nothing about you.
The advertising-ID permission is removed from the app.
- Live wallpaper service: after you confirm Chromweir in Android’s wallpaper picker, Android runs the app’s wallpaper service to draw the moving print. Android alone can start it, it pauses when the screen is off or the wallpaper is hidden, and you can stop it at any time by choosing another wallpaper.
- Touches and home-screen swipes: while the wallpaper is visible, Android may pass it touches on free areas of the home screen and the position of home-screen pages, so the flow can react. These are used for the next frames only and are never stored or sent. Whether touches arrive depends on your home-screen app.
- Wallpaper colours: like any wallpaper, Chromweir tells Android the main colours of the current print, which Android may use for system colour themes. This happens on the phone.
- Haptics and sound: vibrations use Android’s standard haptic feedback, which needs no permission. Interface sounds can be switched off in Settings and play only sound files packaged with the app; the wallpaper itself is silent. Nothing is recorded.
Android automatic backup is turned off, and both cloud backup and device-to-device transfer are excluded for all app data. To move your prints, export a backup yourself and import it on the other device.
8Bundled software and data
The app is built with AndroidX and Jetpack Compose libraries and with Kotlin, kotlinx.coroutines and kotlinx.serialization, all under the Apache License 2.0, and uses the Onest and Noto Sans Mono typefaces under the SIL Open Font License 1.1. Globe prints use coastlines made with Natural Earth (public domain). The Daylight city list is a reduced offline extract of GeoNames data, used under CC BY 4.0. These components and data are packaged inside the app and send nothing anywhere. The app contains no advertising, analytics, social-media, payment, account or crash-reporting SDK. Licence texts and credits are available offline in the app under Settings → About → Fonts, code and map licences.
9Your choices and deletion
You can view and change everything you have saved directly in the app, switch sounds, haptics and motion on or off in Settings, export a complete copy at any time and remove everything with Settings → Your data → Delete all. The app first offers to export a copy and asks you to confirm. Deletion removes your saved prints, draft, settings and recovery copies from the app; the wallpaper on your screen goes back to the first built-in print. Clearing the app’s storage in Android Settings or uninstalling the app also removes its private data; uninstalling also removes Chromweir as your live wallpaper.
Deleting data in Chromweir does not delete backups, design files or pictures you saved elsewhere, files you already shared, a still picture you set on your lock screen, or copies held by a cloud provider or another app. Remove those yourself. Because we never receive your data, we cannot recover it for you or delete it remotely, and there is no account to close.
10Security and limitations
Android’s app sandbox keeps the app’s private storage separate from other apps. Chromweir writes its files atomically, limits the size of files it opens and rejects damaged, oversized or unknown files before importing them. These checks protect against damaged files; they are not encryption and do not prove that a file came from someone you trust, so import only files you trust. Anyone who can unlock your phone can open the app, and your wallpaper is visible to anyone who sees your screen. Loss, theft or failure of your device, or malware on it, can expose or destroy local records. No security measure is perfect; keep a backup when your prints matter to you.
11Legal bases for processing
Where the EU or UK GDPR, or a similar law such as the Swiss FADP or Brazil’s LGPD, applies, these are the legal bases for the limited processing described in this policy:
| Processing | Where it happens | Legal basis |
|---|---|---|
| Storing your entries and settings in the app’s private storage | Your device only; we never receive it | Necessary to provide the app you choose to use (Art. 6(1)(b) GDPR). Storage on your device is strictly necessary for that service, so no separate consent is needed under the ePrivacy rules. |
| E-mails you send to [email protected] | The developer and its e-mail provider | Our legitimate interest in answering you and improving the app (Art. 6(1)(f) GDPR) or steps you ask us to take (Art. 6(1)(b)); keeping records where the law requires it (Art. 6(1)(c)). |
The app makes no automated decisions that have legal or similarly significant effects on you, does not build a profile of you and does not process special categories of personal data.
12Retention and support
Data in the app stays until you change or delete it, clear the app’s storage or uninstall the app; exported copies stay wherever you put them. Temporary share and undo copies are removed after the operation finishes or when you delete all data. If you choose to e-mail support, we receive your e-mail address, your message and anything you decide to attach. Please do not send backups or your coordinates unless they are needed to help you.
Support e-mails. We keep e-mails you send us, and our replies, only as long as needed to handle your request and any follow-up, normally no longer than 24 months after the last message, unless the law requires us to keep them longer or we need them to establish, exercise or defend legal claims. You can ask us to delete them earlier.
13Ads, purchases and future versions
Today. The current version of Chromweir is free of charge, shows no ads, has no in-app purchases or subscriptions, and contains no advertising, analytics or payment SDKs. This describes the app as it is now, not a promise about future versions. Future versions may introduce advertising, paid features, in-app purchases or subscriptions, or other optional services.
If ads are introduced. Ads would be supplied by a third-party ad network, for example Google AdMob. Ad networks typically process your device’s advertising ID, IP address, approximate location derived from the IP address, device and app information and your interactions with ads, in order to show ads, limit repetition, measure performance and prevent fraud, and, only where you allow it, to personalise ads. Ads would also require the app to connect to the internet, which the current version cannot do.
If purchases or subscriptions are introduced. They would be processed by Google Play’s billing system. Google handles your payment details under the Google Privacy Policy. We would receive only what is needed to deliver and verify a purchase, such as a purchase token, the product, its status, the country and the currency, never your full card or bank details.
Before any such change we will update this policy with a new effective date and version, describing what data is processed, by whom, why and how you can control it; update the Google Play Data safety section; mention the change in the release notes; ask for your consent where the law requires it (for example for personalised ads and non-essential access to your device in the EEA, the UK and Switzerland, through a consent tool that meets Google’s requirements); and offer the opt-outs the law requires (for example under US state privacy laws). The change applies only from the app version that introduces it. Data already stored in the app will not be used for advertising without telling you first and, where required, getting your consent. We will not knowingly show personalised ads to children (§14).
14Age and intended audience
Chromweir is intended for teenagers and adults aged 13 and above and is not directed to children under 13. Abstract wallpapers appeal to people of all ages, but that does not make the app designed for children. The content rating shown on Google Play and the intended audience are separate things. The app has no chat, no public profiles and no way to contact other users.
Age limits. In the EEA and the UK we also treat as a child anyone under the age at which a child may consent to online services in their country (between 13 and 16). If you are a parent or guardian and believe that your child has sent us personal data, for example by e-mail, write to [email protected] and we will delete it. If a future version includes advertising, it will be set up in line with applicable children’s privacy rules, such as COPPA in the United States, and Google Play’s policies.
15Your privacy rights
Privacy laws in many countries give you rights over your personal data. Because Chromweir keeps your data on your phone and the developer does not receive it, most of these rights are in your own hands: you can view, correct, export and delete everything in the app (§9) and withdraw permissions in Android Settings. For data you have sent us, such as e-mails, write to [email protected].
EU and UK representative. The individual developer does not process personal data of people in the EU/EEA or the UK except occasional e-mails you choose to send to support. This occasional processing does not involve large-scale processing of special-category or criminal-offence data and is unlikely to result in a risk to your rights and freedoms. Under Article 27(2)(a) GDPR and Article 27(2)(a) UK GDPR, it does not require an EU or UK representative, so none is appointed. Contact us directly at [email protected]; you can also complain to your local supervisory authority.
Rights by region. A summary; the law where you live decides the details.
- European Union, EEA, United Kingdom and Switzerland (GDPR, UK GDPR, Swiss FADP): access, rectification, erasure, restriction of processing, data portability, objection to processing based on legitimate interests, withdrawal of consent at any time, and complaint to a supervisory authority, for example in the country where you live or work (in the UK, the Information Commissioner’s Office).
- United States (California CCPA as amended by the CPRA, and the comprehensive privacy laws of other states such as Virginia, Colorado, Connecticut, Texas and Oregon): to know and access, delete, correct and port personal information; to opt out of its sale or sharing, of targeted advertising and of profiling; to limit the use of sensitive personal information; to appeal a refusal; to use an authorised agent; and not to be discriminated against for using these rights. Notice for California residents: in the last 12 months the developer has not collected personal information through the app, other than e-mails you chose to send us. We have not sold or shared personal information, and we do not use sensitive personal information. Global Privacy Control signals are honoured where the law requires; today there is nothing to opt out of.
- Canada (PIPEDA and provincial laws, including Québec’s Law 25): access, correction and withdrawal of consent; complaints to the Office of the Privacy Commissioner of Canada or, in Québec, the Commission d’accès à l’information.
- Brazil (LGPD): confirmation of processing, access, correction, anonymisation, blocking or deletion, portability, information about sharing and revocation of consent; complaints to the ANPD.
- Japan (APPI): disclosure, correction, suspension of use or deletion; complaints to the Personal Information Protection Commission.
- South Korea (PIPA): access, correction, deletion, suspension of processing and withdrawal of consent; complaints to the Personal Information Protection Commission or the KISA privacy centre. The person responsible for personal information is the developer, reachable at [email protected].
- Australia and New Zealand (Privacy Act 1988, Privacy Act 2020): access and correction; complaints to the OAIC or the New Zealand Privacy Commissioner.
- Other countries (for example India’s DPDP Act, Singapore’s PDPA, South Africa’s POPIA or Türkiye’s KVKK): the rights your local law gives you. Write to us and we will respond in line with it.
How we respond. We answer within one month, or sooner or later where your local law sets another period (for example 45 days under the CCPA), and we may extend it where the law allows. We may ask for information to confirm that a request comes from you. Requests are free unless they are manifestly unfounded or excessive. If we cannot do what you ask, we explain why and how you can appeal or complain.
16International users
Chromweir is available in many countries. The developer does not receive the data you keep in the app, so we do not transfer it anywhere.
If you e-mail us, your message is processed by our e-mail provider and may be stored on servers outside your country. Where the GDPR or UK GDPR applies to such a transfer, it relies on an adequacy decision, on standard contractual clauses offered by the provider, or on the transfer being necessary to answer your request.
This policy is written in English. If a translation is offered, the English version prevails unless your local law requires otherwise.
17Changes to this policy
We may update this policy when we change the app (including any change described in §13), when the services the app uses change, or when the law changes. The effective date and version at the top of this page show which version applies, and the version history (§18) summarises every change.
For a material change, for example new data leaving your device, ads or purchases, we update this page and the Google Play Data safety section before the app version with that change is published, describe it in the release notes, and ask for your consent in the app where the law requires it. Changes do not apply retroactively to data processed before them. Earlier versions are available on request from [email protected].
18Version history
| Version | Effective | Changes |
|---|---|---|
| 1.0 | 2026-10-29 | First published: offline live wallpaper and still pictures, local storage, a built-in city list instead of location access, user-initiated backups, design files and pictures, no internet access, accounts, ads or analytics. Includes support e-mail, regional rights and the Article 27 exemption. |
19Contact
- Developer (controller): Zydeno, the developer of Chromweir on Google Play
- E-mail for privacy questions and requests: [email protected]
- Website: zydeno.com
We aim to answer within 30 days. If you are not satisfied with our answer, you can contact your local data-protection authority.
See also the Terms of Use.