Privacy Policy

Effective date: October 20, 2026

Limbur is a reading companion that lets you capture passages from books, understand the people, places, and moments within them, and create illustrations that remain familiar as you continue reading.

This Privacy Policy explains what information Limbur collects, how it is used, where it may be processed, and what happens to it when you delete your account.

Limbur is operated by Omar El Atyqy. If you have questions about this policy or your data, contact us at support@limbur.app.

Information you provide

When you use Limbur, you may provide information including book details, photographs or scans of passages, text extracted from those passages, and other material you choose to submit through the app.

When you sign in with Apple, Limbur receives the information Apple makes available for authentication. This may include an Apple-provided account identifier and, depending on your Apple settings, your name or email address. If you use Hide My Email, Apple may provide a private relay address instead of your personal email address.

Information Limbur creates

To provide the service, Limbur may create and store information derived from the material you submit. This includes information about books, excerpts, characters, places and other entities mentioned in passages, descriptions of their appearance or state, generated visual references, and generated illustrations.

Limbur also stores information necessary to operate your account, including your remaining Moments and records needed to safely fulfil in-app purchases.

Product usage data

Limbur records short, structured notes about how the app is used, which we call product events. We use them to understand whether Limbur works well, where people get stuck, and which features are worth improving.

Examples of product events include: the app was opened, a session started, a tutorial step was shown, completed or skipped, sign-in started or succeeded, a book was saved, a page was photographed or uploaded, a passage was saved, an illustration was requested, finished or viewed, the Moments shop was opened, and a purchase was started, cancelled or verified.

An event can carry only a fixed set of details, such as the app version and build, the iOS version, whether the device is a phone or tablet, your language and region setting, counts (for example how many pages or paragraphs), durations, success or error categories, the Moments pack involved, and internal identifiers for items such as a book or an illustration. Those identifiers point to items in your own library but contain none of their content.

Product events never contain free text. They do not include passage text, instructions you write, names of characters or places, book titles, your name, or your email address. Limbur's server rejects any event that does not match the fixed set of allowed details.

Before you sign in, for example while you follow the tutorial, Limbur records only a small set of events (opening the app, sessions, tutorial steps, sign-in prompts and sign-in attempts). These are not linked to an account. They are tied to a random installation identifier, created when Limbur is first opened on a device, and a random session identifier. These identifiers are generated by Limbur and are not your device's advertising identifier.

After you sign in, product events are linked to your account and carry the same installation identifier, so events from before and after sign-in on the same device can be connected.

Your network address is used briefly to limit how often events can be sent, and it is not stored with the events.

Product events are kept for 90 days and then deleted.

Product events are used only by Limbur. We do not sell them, and we do not share them with Meta or other advertising partners. Your choice in the App Tracking Transparency prompt does not change these events, because they never leave Limbur's own systems.

Limbur may occasionally ask Apple to show its standard rating prompt. How often it has asked is counted on your device and is not sent to us.

How we use your information

We use this information to provide and operate Limbur. This includes understanding passages, maintaining continuity as you read, generating illustrations, storing your library, authenticating your account, processing eligible in-app purchases, maintaining the reliability and security of the service, and diagnosing technical problems.

We do not sell your personal information.

We do not use the contents of your Limbur library for advertising, and we do not share it with advertising partners.

Advertising and measurement

Limbur uses the Meta SDK, provided by Meta Platforms, Inc., to measure how our advertising performs, such as whether an ad led to an installation of the app.

The SDK starts when Limbur opens and logs standard app events automatically. These may include the app being installed and opened and, where the SDK detects them, in-app purchases. The SDK may also send Meta device information and crash or diagnostic information. Limbur does not send Meta its own product events, your library, passages, illustrations, or account details.

Shortly after the app first opens, iOS asks whether Limbur may track you. The prompt reads: "Limbur uses this to measure which ads bring readers to the app. It never reads your books or pages."

If you allow tracking, the SDK is told that advertiser tracking is enabled, and the events it sends may include your device's advertising identifier.

If you decline, or if your device does not allow apps to ask, the SDK is told that advertiser tracking is disabled and your advertising identifier is not shared. The SDK may still send the app events described above, which Meta uses for aggregated, privacy-preserving measurement, such as Aggregated Event Measurement and Apple's SKAdNetwork.

Meta may use information it receives as described in its own privacy policy.

You can change your choice at any time in iOS Settings, either under Privacy & Security > Tracking or under Limbur > Allow Tracking. Limbur applies your current choice the next time it opens.

AI processing

Some features in Limbur use artificial intelligence services to understand passages and generate visual content.

Material needed to perform a request may be sent to our AI infrastructure and service providers for processing. This can include passage text, descriptions derived from passages, and images required to generate or maintain visual continuity.

Limbur currently uses Microsoft Azure services for AI and image generation.

Service providers

Limbur relies on third-party infrastructure providers to operate the service. These currently include:

• Supabase, for authentication, relational database services (including product events), and object storage.
• Microsoft Azure, for application hosting and AI services.
• Neo4j Aura, for graph database services used to maintain relationships and continuity within your library.
• Apple, for Sign in with Apple, App Store distribution, and in-app purchases.
• Meta Platforms, Inc., for advertising measurement through the Meta SDK, as described above.
• Open Library, where applicable, to help locate publicly available book metadata and cover information.

These providers process information only as necessary for the services they provide to Limbur and are subject to their own privacy and security obligations.

Purchases

Purchases of Moments are processed by Apple through the App Store.

Limbur does not receive or store your full payment-card information. We receive information necessary to verify and fulfil eligible App Store transactions, such as transaction and product identifiers.

Storage and retention

We retain your information while your Limbur account remains active and for as long as necessary to provide the service.

Product events are an exception: they are kept for 90 days and then deleted, whether or not your account remains active.

Some operational information may be retained temporarily where necessary for security, reliability, fraud prevention, legal compliance, or recovery from technical failures.

Information held independently by third parties, including Apple transaction records, may remain subject to those providers' own retention requirements.

Account deletion

You can delete your Limbur account from within the app.

When account deletion completes successfully, Limbur deletes the account and the associated data we control, including your library, captured passages, generated illustrations, visual references, account profile, and related stored files.

Deleting your account also deletes the product events linked to it, and the events recorded before sign-in on any installation of Limbur you used while signed in to that account. Events from an installation that was never signed in to your account cannot be connected to you, and are deleted when their 90 days end.

Limbur attempts to delete this content before removing your authentication identity so that a partially completed deletion does not leave inaccessible content behind.

If you later sign in again after deleting your account, Limbur treats you as a new user. Your previous library and generated content cannot be restored through the new account.

Deletion from Limbur does not cause third parties such as Apple to delete records they are independently required or permitted to retain.

Security

We use reasonable technical and organizational safeguards designed to protect information handled by Limbur. These include authenticated access, encrypted network connections, access controls, and separation between development and production systems.

No internet service can guarantee absolute security.

International processing

Our service providers may process or store information in countries other than the country where you live. Where required, such processing is subject to the safeguards provided by the relevant service provider and applicable law.

Your choices and rights

You can access much of the information associated with your account directly through Limbur and can delete your account from within the app.

You can allow or stop tracking for advertising measurement at any time in iOS Settings, as described under Advertising and measurement.

Depending on where you live, you may also have legal rights relating to access, correction, deletion, restriction, portability, or objection to certain processing of your personal information.

To make a privacy request, contact support@limbur.app.

We may need to verify that the request relates to your account before acting on it.

Changes to this policy

We may update this Privacy Policy as Limbur changes.

If we make material changes, we will update the effective date and, where appropriate, provide notice through the app or another reasonable method.

Contact

Limbur
Operated by Omar El Atyqy
support@limbur.app