BookBook Terms of Service

Effective date: July 13, 2026 Last updated: July 13, 2026

These Terms of Service ("Terms") are a binding agreement between you ("you") and BookBook ("we", "us", "our"). They govern your access to and use of the BookBook mobile and web application and related services (together, the "Service" or the "App").

Please read these Terms carefully. By creating an Account or using the Service, you agree to them. If you do not agree, do not use the Service.

These Terms work alongside our Privacy Policy and our Account & Data Deletion information. The Privacy Policy explains how we handle your Personal Data and is incorporated into these Terms by reference.

Acceptance and eligibility
Description of the Service
Accounts and security
Sign in with Google
Your Content
Acceptable use
Lending and borrowing between users
Third-party services and book metadata
Our intellectual property
Feedback
Termination and account deletion
Disclaimers
Limitation of liability
Indemnity
Governing law and disputes
Apple App Store terms
Google Play note
Changes to these Terms
General
Contact

1. Acceptance and eligibility

By creating an Account, accessing, or using the Service, you agree to be bound by these Terms and by our Privacy Policy. If you use the Service on behalf of another person or an organization, you confirm that you are authorized to accept these Terms on their behalf.

Minimum age. You must be at least 13 (or 16 in the EEA/UK where required) years old to create an Account or use the Service. If you are under the age of majority where you live, you may use the Service only with the involvement and consent of a parent or legal guardian who agrees to these Terms. We collect a birthdate at sign-up to check your age and to gate books and content marked as mature; if you do not meet the minimum age, you may not use the Service. See the "Children" section of our Privacy Policy for more detail.

You may not use the Service if we have previously banned you or if applicable law prohibits you from doing so.

2. Description of the Service

BookBook is a personal book-library app. Its features include:

Photographing a bookshelf, then reading the spine text on your device to help you catalog those books.
Capturing or uploading cover and spine images and saving them to your library.
Looking up book metadata (title, author, ISBN, publisher, year, page count, language) and cover images from third-party book databases.
Cataloging books; recording reading status, star ratings (in quarter-star increments), written reviews and notes (some of which you can mark private), reading-language preferences, and shelves.
Connecting with Friends, and lending or borrowing books through Lending Records and invite/share links.

The Service is available today as a web application, with native iOS and Android versions planned. We may add, change, or remove features at any time. We aim to keep the Service available and working, but we do not guarantee that it will always be uninterrupted or error-free.

3. Accounts and security

To use most features you must create an Account. You can register with an email address and password, or by using Sign in with Google (see Section 4). You may also choose a display name and upload a profile picture (avatar).

You agree to:

Provide accurate information and keep it up to date.
Keep your password and login credentials confidential.
Be responsible for all activity that happens under your Account.
Notify us promptly at moltenorobin@gmail.com if you suspect unauthorized use of your Account.

You are responsible for the security of the device and login method you use. We are not liable for losses caused by someone else using your Account with or without your permission, to the extent the law allows.

If you choose Sign in with Google, Google shares your name, email address, and Google profile picture with us so that we can create and authenticate your Account. We use that information only to operate the sign-in feature and to populate your profile.

Our use of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements. We do not sell that information, use it for advertising, or transfer it to third parties except as needed to provide the Service or as required by law. For more detail, see the "Sign in with Google" section of our Privacy Policy.

Your use of Sign in with Google is also subject to Google's own terms and policies.

5. Your Content

"Content" means the book and library data and materials you create or upload through the Service, including books and their details, reading status, ratings, reviews and notes, shelves, reading preferences, cover and spine photos, your avatar, and the free-text names you enter for people.

You own your Content. These Terms do not transfer ownership of your Content to us.

Licence to us. To operate the Service, you grant us a worldwide, non-exclusive, royalty-free licence to host, store, reproduce, adapt (for example, to resize an image or generate a thumbnail), and display your Content. This licence exists only so that we can run and provide the Service to you and, where you choose to share Content, to the people you share it with (for example, Friends who can see your non-private books and shelves, or a lending counterparty who can see a Lending Record). The licence ends when you delete the relevant Content or your Account, except for copies we are permitted to retain as described in our Privacy Policy and reasonable backup copies that are overwritten in the ordinary course.

Your representations. For any Content you upload or create, you represent and warrant that:

You have the necessary rights to it, and your uploading and use of it through the Service does not infringe anyone's copyright, trademark, privacy, or other rights. This includes cover and spine photographs you take or upload and any reviews or notes you write.
If you enter another person's name — for example, the name of a borrower who is not a BookBook user — you have a legitimate reason to record it, and you use it only to track the relevant loan.
Your Content does not violate these Terms, the Acceptable Use section below, or any applicable law.

You are solely responsible for your Content and the consequences of sharing it. We do not endorse any Content and are not responsible for it, though we may act on it as described in Section 6.

6. Acceptable use

You agree not to use the Service to:

Post, upload, or share Content that is illegal, infringing, defamatory, harassing, hateful, threatening, obscene, or otherwise objectionable.
Violate anyone else's intellectual property, privacy, or other rights.
Impersonate any person or misrepresent your affiliation with anyone.
Harass, abuse, threaten, or harm other users, including through reviews, notes, borrower names, invite links, or the Friends and lending features.
Misuse the Friends or lending features — for example, sending unwanted or repeated invites, or entering false or malicious information into Lending Records.
Scrape, crawl, harvest, or use automated means to access or collect data from the Service, or attempt to extract other users' data.
Interfere with or disrupt the Service, probe or test its security, circumvent access controls, or introduce malware.
Reverse engineer, decompile, or attempt to derive the source code of the App, except to the extent this restriction is prohibited by law.
Use the Service in any way that breaches applicable law or these Terms.

Content moderation and enforcement. Some of your Content can be seen by other users — for example, your non-private books and shelves are visible to your accepted Friends, and Lending Records are visible to the lending counterparty. We provide tools to report or flag objectionable Content and to block abusive users. We may review reported Content and may remove Content, limit visibility, or suspend or terminate Accounts that we reasonably believe violate these Terms. We aim to review reports of objectionable user-generated Content promptly, typically within 24 hours. We are not obligated to monitor Content, but we may do so. Private books and notes are not shared with other users.

To report Content or a user, use the in-app reporting and blocking tools or contact us at moltenorobin@gmail.com.

7. Lending and borrowing between users

BookBook lets you record that you have lent a physical book to, or borrowed one from, another person, including due dates, status, and a borrow queue. These records are a convenience to help you keep track of your own books.

Loans of physical books are solely between the users involved. We are not a party to any loan, we do not take custody of any book, and we do not guarantee that a book will be returned, that it will be in any particular condition, or that any user will behave honestly. Any dispute about a physical book — including loss, damage, non-return, or condition — is between the users involved, and you agree to resolve it directly with the other person. We are not responsible for and disclaim all liability arising from loans, borrowing arrangements, or interactions between users.

You are responsible for deciding whom you lend to or borrow from and on what terms.

8. Third-party services and book metadata

The Service relies on third-party services, and some Content is provided by them:

Book metadata and covers come from third-party databases such as the Google Books API and Open Library. When you search, we send only text queries (such as an ISBN, title, or author) to these services to fetch metadata and cover images. We do not send them your Account data or your photos. Cover images may load directly from third-party cover sources.
Sign in with Google is provided by Google LLC, as described in Section 4.
Hosting and storage for the native apps is provided by Supabase, which stores your Account and Content on our behalf.

Book metadata, cover images, and other third-party data are provided "as is." We do not control and are not responsible for the accuracy, completeness, or availability of third-party services or the data they return. Your use of a third-party service may be subject to that provider's own terms and privacy policy. For more on how these third parties are involved, see our Privacy Policy.

9. Our intellectual property

The Service itself — including the App, its software, design, text, graphics, logos, and the "BookBook" name and branding — is owned by us or our licensors and is protected by intellectual property laws. Subject to your compliance with these Terms, we grant you a personal, limited, non-exclusive, non-transferable, revocable licence to use the App for your personal, non-commercial use.

Except as expressly allowed here, you may not copy, modify, distribute, sell, license, or create derivative works from any part of the Service. All rights not expressly granted are reserved. This licence does not cover your Content, which is addressed in Section 5, or third-party book metadata and covers, which belong to their respective owners.

10. Feedback

If you send us ideas, suggestions, or feedback about the Service, you grant us a perpetual, irrevocable, worldwide, royalty-free licence to use and incorporate that feedback for any purpose, without any obligation or compensation to you. Feedback is voluntary, and we are free to use it without restriction.

11. Termination and account deletion

You may stop using the Service at any time. You can delete your Account and associated Content from inside the App (in your Profile or Settings), and you can also request deletion through the web at https://bookbookbookbookbook.com/delete-account without reinstalling or signing in to the App. Deletion removes your Account and cascades to your library Content, images, reviews and notes, and your friend and lending records and links, subject to the limited retention and the details described in our Account & Data Deletion information and our Privacy Policy.

We may suspend or terminate your Account if you materially breach these Terms, if we are required to by law, or if we reasonably need to protect the Service or other users. Where practical and lawful, we will give you notice.

Sections that by their nature should survive termination — including Sections 5 (licence grant to us, as limited there), 9, 10, 12, 13, 14, 15, and 19 — survive.

12. Disclaimers

To the fullest extent permitted by law, the Service is provided "as is" and "as available," without warranties of any kind, whether express, implied, or statutory. We disclaim all implied warranties, including merchantability, fitness for a particular purpose, title, and non-infringement.

We do not warrant that the Service will be uninterrupted, secure, or error-free; that defects will be corrected; that book metadata, covers, or other data will be accurate or complete; or that the Service will meet your requirements. You use the Service at your own risk. We use reasonable measures to protect your data, but no method of transmission or storage is completely secure, and we cannot guarantee absolute security.

Nothing in these Terms excludes or limits any warranty or right that cannot be excluded or limited under applicable law.

13. Limitation of liability

BookBook is provided to you free of charge. Nothing in these Terms excludes or limits our liability where it may not be excluded or limited under applicable law — including liability for intent (Vorsatz) or gross negligence, for injury to life, body, or health, under the German Product Liability Act (Produkthaftungsgesetz), or under any guarantee we expressly give.

Subject to the paragraph above:

For slight negligence, we are liable only where we breach a material contractual obligation (a "cardinal obligation" — an obligation whose fulfilment is essential to the proper performance of these Terms and on whose fulfilment you may reasonably rely). In that case our liability is limited to the damage that was foreseeable and typical for an agreement of this kind.
We are not otherwise liable for indirect or consequential loss, or for loss of profits, data, goodwill, or business opportunities.
We are not liable for loss or damage arising from loans of physical books or other interactions between users, or from third-party services, except within the limits set out above.

These limitations also apply in favour of our staff, agents, and contractors. Mandatory consumer-protection rights you have under the law of your country of residence are not affected.

14. Indemnity

To the extent permitted by applicable law, you are responsible for damage you cause us through your intentional or negligent breach of these Terms or of the law — for example, by uploading Content you had no right to use, or by misusing the friend or lending features. This does not create obligations beyond what the law provides and does not apply where mandatory consumer-protection law provides otherwise. If a third party brings a claim against us because of your unlawful Content or conduct, we may ask you to cooperate with our defence.

15. Governing law and disputes

These Terms are governed by the laws of Germany, without regard to its conflict-of-laws rules.

Any disputes arising out of or in connection with these Terms will be subject to the jurisdiction of the competent German courts. Nothing in this section removes any mandatory consumer-protection rights you have — including any right to bring proceedings in, or to rely on the mandatory law of, your country of residence in the EEA.

Consumer dispute resolution. We are not obligated to, and do not, participate in dispute-resolution proceedings before a consumer arbitration board (Verbraucherschlichtungsstelle) within the meaning of the German Consumer Dispute Resolution Act (VSBG).

16. Apple App Store terms

The following additional terms apply when you download or use the iOS version of the App from the Apple App Store ("App Store Sourced Application"). In the event of a conflict between these Terms and Apple's terms as applied to the App Store Sourced Application, Apple's applicable terms control, but only to the extent of the conflict.

Acknowledgement. These Terms are between you and us only, not with Apple. We, not Apple, are solely responsible for the App and its content.
Scope of licence. Your licence to use the App Store Sourced Application is limited to a non-transferable licence to use it on any Apple-branded device that you own or control, as permitted by the Usage Rules in the Apple Media Services Terms and Conditions.
Maintenance and support. We, not Apple, are solely responsible for providing any maintenance and support for the App. Apple has no obligation to furnish any maintenance or support services.
Warranty. We are solely responsible for any product warranties, whether express or implied by law, to the extent not effectively disclaimed. If the App fails to conform to any applicable warranty, you may notify Apple, and Apple may refund the purchase price (if any) for the App. To the maximum extent permitted by law, Apple has no other warranty obligation with respect to the App, and any other claims, losses, liabilities, damages, costs, or expenses attributable to a failure to conform to any warranty are our responsibility, not Apple's.
Product claims. We, not Apple, are responsible for addressing any claims by you or a third party relating to the App or your use of it, including product-liability claims, claims that the App fails to conform to a legal or regulatory requirement, and claims arising under consumer-protection, privacy, or similar law, subject to the limits in these Terms.
Intellectual property claims. In the event of any third-party claim that the App or your possession and use of it infringes that third party's intellectual property rights, we, not Apple, will be solely responsible for the investigation, defense, settlement, and discharge of any such claim, subject to the limits in these Terms.
Legal compliance. You represent and warrant that you are not located in a country subject to a U.S. Government embargo or designated as "terrorist supporting," and that you are not listed on any U.S. Government list of prohibited or restricted parties.
Third-party beneficiary. You acknowledge and agree that Apple and Apple's subsidiaries are third-party beneficiaries of these Terms as they apply to your use of the App Store Sourced Application, and that Apple has the right (and is deemed to have accepted the right) to enforce these Terms against you as a third-party beneficiary.
Apple standard EULA. Your use of the App Store Sourced Application is also subject to Apple's standard Licensed Application End User License Agreement, available at https://www.apple.com/legal/internet-services/itunes/dev/stdeula/, where it applies. These Terms are intended to meet or exceed Apple's minimum terms for a Licensed Application, and where these Terms conflict with the Apple standard EULA, the term that is more protective of you as a user applies to the App Store license.

17. Google Play note

If you obtain the Android version of the App from Google Play, your use is also subject to the Google Play Terms of Service and Google's applicable policies. Google is not a party to these Terms and is not responsible for the App. Account and data deletion is available in-app and at https://bookbookbookbookbook.com/delete-account, as described in Section 11.

18. Changes to these Terms

We may update these Terms from time to time. When we make material changes, we will update the "Last updated" date above and take reasonable steps to notify you, for example through the App or by email. Changes take effect when posted, unless we say otherwise. If you continue to use the Service after changes take effect, you accept the updated Terms. If you do not agree, stop using the Service and delete your Account.

19. General

Entire agreement. These Terms, together with the Privacy Policy and any additional terms we present, are the entire agreement between you and us about the Service.
Severability. If any provision is found unenforceable, the rest remains in effect.
No waiver. Our failure to enforce a provision is not a waiver of it.
Assignment. You may not assign these Terms without our consent. We may assign them in connection with a merger, acquisition, or sale of assets.
Force majeure. We are not liable for delays or failures caused by events beyond our reasonable control.
Headings. Headings are for convenience only and do not affect interpretation.

20. Contact

Questions about these Terms can be sent to:

BookBook — operated by an independent developer (not yet incorporated) Support & privacy: moltenorobin@gmail.com Website: https://bookbookbookbookbook.com

See also our Privacy Policy and Account & Data Deletion information.