LumiScale Privacy Policy
Effective date: September 4, 2026
Last updated: September 15, 2026
Welcome to LumiScale (the “App”), a photography light-metering tool.
We value your privacy. This policy explains how the App accesses, processes, stores, and protects information relating to users, as well as how you can manage the relevant permissions and data. Please read this policy carefully before using the App.
1. Scope
This policy applies to the LumiScale iOS App and the support website at lumiscale.0xf.tech.
This policy does not apply to products and services independently provided by Apple or other third parties. Third parties process information in accordance with their own privacy policies.
2. How the Developer Processes Information
The App does not require registration or login. Under the current feature design, the Developer uses Supabase for the online catalog and support submissions, and Cloudflare Pages for website hosting, does not use advertising or analytics SDKs, and will not sell your information to any third party.
The App processes the following information only to the extent necessary to provide its features:
2.1 Camera Feed and Camera Parameters
- Information processed: The live feed from the rear camera, as well as parameters provided by the device camera, such as aperture, exposure time, and ISO speed.
- Purpose: To display the viewfinder, measure scene brightness, and calculate EV100 and recommended exposure parameters.
- Processing method: The live feed and metering calculations are performed primarily on your device. Unless you actively tap “Save Photo,” the App does not save the viewfinder feed as a photo.
- Permission: Camera access. If you deny permission, the App cannot provide live view, metering, or capture features, but you can still use interface areas and settings that do not depend on the camera.
The App does not read your system photo library and does not automatically write captured photos to the system photo library.
2.2 Saved Photos and Metering Records
When you actively tap “Save Photo,” the App creates a metering record locally on your device. The record may include:
- The photo you took and chose to save;
- The time the record was created;
- The film name and ISO;
- Aperture, shutter speed, and exposure bias (ΔEV);
- A record name generated automatically or edited by you;
- After you grant location permission, the coordinates and place name associated with the record.
The information above is used to display and manage your metering history. By default, it is stored only in the App’s local storage and is not uploaded to the Developer’s servers.
Please note that photos may contain people, homes, identification documents, or other personal information. Before photographing and saving information about others, make sure you have obtained any necessary authorization, and avoid recording unnecessary sensitive content.
2.3 Location Information
- Information processed: The device’s precise location coordinates, as well as place names such as cities and districts derived from those coordinates. Precise location information is sensitive personal information.
- Purpose: To label saved metering records with the place where they were captured, making them easier to review later.
- When it is triggered: When you save a metering record and have not yet granted location permission, the App may request “While Using the App” location access. After permission is granted, the App may update your current location while you are using the App in the foreground so that location can be added to the current or subsequent records.
- Third-party processing: To convert coordinates into a place name, the App uses Apple’s reverse-geocoding service. The relevant coordinates are processed by Apple’s system services. Apple’s processing of this information is governed by Apple’s own privacy policy.
- Effect of denying permission: Denying or disabling location permission does not affect basic metering or record-saving features; the relevant records will not contain location information.
We process precise location only as necessary to label the place where a photo was captured. We do not use it for advertising, profiling, or tracking.
2.4 LiDAR Depth Information
On devices that support LiDAR, you may actively enable the LiDAR distance-measurement feature. The App reads the camera depth stream and calculates the distance near the metering point. Depth data and distance readings are used only for immediate display. In the current version, they are not written to metering records or uploaded to the Developer’s servers. The LiDAR feature depends on camera permission, which you can disable at any time.
2.5 Information You Set or Enter
To retain your usage preferences, the App stores the following information locally on your device:
- Your current film and ISO, focal-length, aperture, and shutter selections;
- Metering calibration values and metering strategy;
- Film, aperture, and shutter lists that you add or edit;
- Metering record names that you edit.
This information is used only to restore settings, perform exposure calculations, and manage records.
2.6 Information the App Does Not Actively Collect
Under the current implementation, we do not actively process or collect:
- Your name, phone number, account password, or other account credentials; an email address voluntarily entered in the support form is an exception;
- Contacts, calendar, microphone, or health data;
- Advertising identifiers;
- Information used to track you across apps or websites;
- Behavioral data used for advertising, profiling, or marketing analysis.
2.7 Online Catalog and Support Website
The App retrieves the public film catalog and development processes from Supabase. Catalog requests do not upload local photos, metering records, or custom processes. Network providers process IP addresses and request metadata needed to serve these requests.
When you submit a support request, we collect its category, title, description, optional email and device/system/App version, submission time, and request ID, solely to investigate and reply. Do not include passwords or unnecessary sensitive information. Submissions pass through Cloudflare Pages and are stored in our Supabase project in Singapore. They are not displayed publicly.
For abuse prevention, the server transforms the request IP into a daily changing, non-reversible identifier to limit submissions. The feedback table does not store raw IP addresses. Cloudflare and Supabase may process network metadata within their infrastructure. The website uses no advertising, behavioral analytics, or tracking cookies.
Feedback is retained for handling the issue and necessary follow-up. Contact us with your request ID to request access, correction, or deletion.
3. System Permissions
| System permission | Purpose | Required? | How to disable |
|---|---|---|---|
| Camera | Live view, metering, capturing and saving metering photos, and LiDAR distance measurement | Required for camera-related features | iOS Settings > Privacy & Security > Camera > LumiScale |
| Location While Using the App | Add coordinates and place names to saved metering records | Optional | iOS Settings > Privacy & Security > Location Services > LumiScale |
After you disable a permission, the App will stop obtaining new data through the corresponding system interface. Disabling a permission does not automatically delete photos or metering records saved previously.
4. Sharing, Transfer, and Public Disclosure of Information
4.1 Sharing
Except in the following circumstances, the Developer will not share your personal information with third parties:
- Hosting and database providers: Cloudflare hosts the site and processes requests; Supabase serves the online catalog and stores feedback, as described in Section 2.7.
- Apple system services: When you grant location permission and save a record, precise location coordinates may be submitted to Apple’s reverse-geocoding service to obtain a place name. You can avoid subsequent processing by disabling location permission. See Apple’s Privacy Policy.
- As required by law: Information may be provided in response to applicable laws and regulations, judicial proceedings, or lawful requests from competent authorities. However, because data in the current version is stored by default only on your device, the Developer generally cannot access or provide this local data.
- With your separate express consent: After explaining the recipient, purpose, method, and categories of information to you, and obtaining your consent as required by applicable law.
4.2 Transfer
The Developer will not transfer your personal information. If a change in operating entity, transfer of assets, or similar event involves personal information, the Developer will notify you of the recipient’s information as required by law and require the recipient to remain bound by this policy. If the purpose or method of processing changes, the Developer will obtain your consent again as required by law.
4.3 Public Disclosure
The Developer will not publicly disclose your personal information unless separate consent has been obtained as required by law or otherwise permitted by applicable laws and regulations.
5. Storage and Retention
5.1 Storage Location
The App’s settings, metering records, location labels, and photos are stored by default on your iOS device. The App currently does not upload this data to servers operated by the Developer.
Depending on your iOS and Apple Account backup settings, the App’s local data may be included in a device backup or iCloud backup. These backups are provided and managed by Apple under its terms and privacy policy. You can manage the relevant backups in your system settings.
5.2 Retention Period
- Metering records, record photos, and location labels: retained until you delete the corresponding record, uninstall the App and clear its data, or clear the App’s data through a system feature;
- Usage preferences and custom lists: retained until you change the relevant settings, uninstall the App and clear its data, or clear the App’s data through a system feature;
- Live camera feed and LiDAR depth stream: processed in memory only for immediate features and not continuously retained, except for photos you actively save.
If data has been included in a device backup or iCloud backup managed by Apple, its deletion and retention period may depend on your backup settings and Apple’s rules.
6. How You Can Manage Information and Exercise Your Rights
You can manage information in the App in the following ways:
- Access: View saved photos, metering parameters, and location labels on the Records page;
- Correct: Edit a record name in the record details, and edit film, ISO, aperture, and shutter lists in Settings;
- Delete: Delete an individual record from the Records list. When you delete a record, photos associated with that record and stored in the App are also deleted;
- Withdraw permission: Disable camera or location permission in iOS system settings;
- Clear all local data: Uninstall the App and clear its data using the method provided by iOS. Note that removing the App icon from the Home Screen alone may not be equivalent to deleting the App’s data;
- Ask questions or file a complaint: Contact us using the contact information in Section 11 of this policy.
Because local App records are not synchronized to the Developer’s server, the Developer generally cannot remotely identify, read, export, or delete data on your device. If you cannot exercise your rights through the methods above, please contact the Developer. The Developer will process your request after verifying it and within the period required by applicable law.
Withdrawing consent does not affect processing carried out on the basis of consent before withdrawal. If a permission is disabled, basic features unrelated to that permission may continue to be available.
7. Information Security
The Developer takes protective measures appropriate to the current form of the product, including relying on the iOS app sandbox and system data-protection mechanisms to limit data access to what is necessary to provide the features and to avoid introducing unnecessary advertising, analytics, and tracking components.
However, no storage method can guarantee absolute security. Please protect your device and passcode, and install system security updates promptly. If you discover a potential information-security issue relating to the App, please contact us using the information in Section 11 of this policy.
8. Protection of Minors
The App is intended for general photography-tool users and is not primarily directed at minors under the age of 14. The App does not actively identify or collect users’ ages.
If you are a minor under the age of 14, you should read this policy under the guidance of a parent or other guardian and obtain the guardian’s consent before using features that may involve the processing of personal information. If a guardian believes that the information of a minor in their care has been processed improperly, they may contact us using the information in Section 11 of this policy.
9. Cross-Border Processing
Local photos and metering records are not uploaded with catalog requests. Support information you voluntarily submit passes through Cloudflare’s global network and is stored in our Supabase project in Singapore. This may involve international processing. The form explains this and requires your confirmation before submission. Refer to Apple’s privacy policy for its system services.
10. Updates to This Policy
The Developer may update this policy due to changes in features, technology, laws and regulations, or operating practices. For general changes, the Developer will provide notice by updating this page and the “Last updated” date at the top. If a change may materially affect your rights and interests relating to personal information, the Developer will provide separate notice through an in-app notice, system alert, or other prominent method, and will obtain your consent again when required by law.
Without your consent, the Developer will not reduce the rights you are entitled to under this policy.
11. Contact Us
Contact email: [email protected]
If you have any questions, comments, complaints, or requests concerning this policy, the App’s privacy practices, or your personal-information rights, please contact the Developer using the email address above. The Developer will respond within the period required by applicable law after receiving and verifying your request.