Book Engine

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Terms and Conditions

Last Updated: January 2026

Welcome to Book Engine ("Service"), operated by YMMV LLC ("Company," "we," "us," or "our"). By accessing or using our Service, you agree to be bound by these Terms and Conditions ("Terms") and our Privacy Policy. Please read them carefully before using our Service.

1. Acceptance of Terms

1.1 Agreement. By creating an account, accessing, or using our Service, you confirm that you: (a) have read, understood, and agree to be bound by these Terms; (b) are at least 18 years of age or the age of legal majority in your jurisdiction, whichever is higher; (c) have the legal capacity to enter into a binding agreement; and (d) are not prohibited from using the Service under applicable laws.

1.2 Rejection. If you do not agree with any part of these Terms, you must immediately cease using the Service and delete your account.

2. Service Description

2.1 Overview. Book Engine is a web application that generates novel-length books using artificial intelligence. The Service processes user inputs including author name, plot descriptions, and stylistic preferences to generate book content through third-party AI models.

2.2 AI-Generated Content. You acknowledge and agree that:

  • All book content is generated by third-party artificial intelligence systems, not written by human authors
  • AI-generated content may contain factual inaccuracies, inconsistencies, or errors
  • The quality, coherence, and appropriateness of generated content may vary
  • We do not guarantee that generated content will meet your expectations or be suitable for any particular purpose
  • You are solely responsible for reviewing, editing, and verifying all generated content before publication or distribution

2.3 Service Availability. We strive to maintain continuous availability of the Service but do not guarantee uninterrupted access. The Service may be temporarily unavailable due to maintenance, updates, technical issues, or circumstances beyond our control. We reserve the right to modify, suspend, or discontinue any aspect of the Service at any time without prior notice.

2.4 Generation Time. Book generation is a computationally intensive process that may take significant time to complete. Generation times may vary based on server load, AI provider availability, and other factors. We do not guarantee specific completion times.

3. Account Registration and Security

3.1 Account Creation. To use certain features of the Service, you must create an account by providing accurate, current, and complete information. You agree to update your account information promptly if it changes.

3.2 Account Security. You are responsible for maintaining the confidentiality of your account credentials and for all activities that occur under your account. You agree to:

  • Create a strong, unique password for your account
  • Not share your account credentials with any third party
  • Notify us immediately at support@bookengine.xyz if you suspect unauthorized access to your account
  • Log out of your account at the end of each session when using shared devices

3.3 Account Responsibility. You are solely responsible for all activities conducted through your account, whether or not authorized by you. We are not liable for any loss or damage arising from unauthorized use of your account.

3.4 One Account Per User. Each user may maintain only one account. Creating multiple accounts to circumvent restrictions, abuse promotions, or for any other purpose is prohibited and may result in termination of all associated accounts.

4. Intellectual Property

4.1 Our Intellectual Property. All intellectual property rights in and to the Service, including but not limited to the software, algorithms, user interface, design, trademarks, logos, and documentation (excluding user-provided inputs and generated books) are owned exclusively by YMMV LLC or our licensors. You may not copy, modify, distribute, sell, lease, reverse engineer, decompile, or create derivative works of any part of the Service without our prior written consent.

4.2 Your Rights to Generated Content. Subject to these Terms and your compliance with them, you retain ownership of the books generated using your inputs. You have the right to use, publish, distribute, sell, or otherwise exploit your generated content as you see fit. However, you acknowledge that:

  • The legal status of copyright in AI-generated works varies by jurisdiction and is subject to evolving legal interpretations
  • We make no representations or warranties regarding your ability to obtain copyright registration for generated content
  • You are solely responsible for ensuring your use of generated content complies with applicable laws
  • Similar inputs from different users may result in similar or overlapping generated content; we do not guarantee uniqueness

4.3 Your Inputs. You retain ownership of the original creative inputs (plot descriptions, character concepts, etc.) you provide to the Service. You represent and warrant that you have the right to use any inputs you provide and that your inputs do not infringe any third-party intellectual property rights.

5. User-Generated Content and License Grant

5.1 License to Us. By using the Service and providing inputs, you grant YMMV LLC a limited, non-exclusive, worldwide, royalty-free license to:

  • Process your inputs through AI systems for the purpose of generating book content
  • Store your inputs and generated content on our servers
  • Display excerpts or samples of generated content for marketing and promotional purposes only, provided such use does not reveal the complete work

This license does not permit YMMV LLC to sell, publish, or distribute your complete generated works without your explicit written consent.

5.2 Your Responsibility. You are solely responsible for your inputs and the generated content. You represent and warrant that your inputs:

  • Do not infringe, misappropriate, or violate any third-party intellectual property, privacy, or other rights
  • Do not contain unlawful, defamatory, obscene, or otherwise objectionable material (except as permitted in NSFW features)
  • Comply with all applicable laws and regulations

5.3 Content Moderation. YMMV LLC does not pre-screen or regularly monitor user inputs or generated content. However, we reserve the right to review, remove, or disable access to any content that violates these Terms, applicable law, or that we deem inappropriate in our sole discretion. We are not liable for any failure to remove objectionable content.

6. Prohibited Uses

You agree not to use the Service to:

  • Generate content depicting minors in sexual, violent, or otherwise inappropriate situations
  • Create content that promotes, glorifies, or incites violence, terrorism, or hatred against individuals or groups
  • Produce content that infringes third-party copyrights, trademarks, or other intellectual property rights
  • Generate content designed to harass, threaten, defame, or harm any person
  • Create fraudulent, deceptive, or misleading content intended to impersonate real individuals
  • Circumvent, disable, or interfere with security features of the Service
  • Use automated scripts, bots, or other means to access the Service in violation of these Terms
  • Attempt to gain unauthorized access to our systems, other users' accounts, or data
  • Reverse engineer, decompile, or attempt to extract the source code of the Service
  • Resell, sublicense, or commercially exploit the Service without authorization
  • Violate any applicable local, state, national, or international law or regulation

7. NSFW Content Terms

7.1 Age Requirement. NSFW (Not Safe For Work) book generation features are available only to users who are at least 18 years of age. By subscribing to or using NSFW features, you represent and warrant that you are at least 18 years old and legally permitted to access adult content in your jurisdiction.

7.2 Separate Subscription. NSFW book generation requires a separate NSFW subscription, which is priced differently from regular subscriptions. NSFW subscriptions and regular subscriptions operate independently, each with their own book generation quotas.

7.3 Content Restrictions. While NSFW features permit explicit adult content, the following content is strictly prohibited:

  • Any content depicting minors in sexual or inappropriate situations
  • Non-consensual sexual content presented approvingly
  • Content promoting or glorifying illegal activities
  • Content that violates applicable laws or regulations

7.4 Account Termination. Violation of NSFW content restrictions may result in immediate account termination without refund. We reserve the right to review reported content and take appropriate action.

7.5 No Cover Images. NSFW books do not include AI-generated cover images due to limitations of image generation APIs. A text-based title page is provided instead.

7.6 Privacy. NSFW content is subject to the same privacy protections as regular content. We do not review, share, or display your generated NSFW books publicly. Your content remains private and accessible only through your account.

7.7 User Responsibility. You are solely responsible for ensuring that your use of NSFW features complies with all applicable laws in your jurisdiction. Some jurisdictions may restrict or prohibit certain types of adult content.

8. Fees; Billing; Payment Authorization

8.1 Fees. You agree to pay all fees, charges, and taxes associated with your account and use of the Service ("Charges"). Prices and features are subject to change at any time.

8.2 Payment Methods. You authorize YMMV LLC and its payment processors to store and automatically charge the payment method(s) you provide for all Charges when due, including recurring subscription fees, overage fees, add-ons, and applicable taxes. You represent that you are authorized to use any payment method you provide and that all billing information is accurate and complete.

8.3 Account Balance and Re-Presentment. If a payment is declined or reversed, you authorize us to re-attempt the charge (including via card updater services) and to charge any applicable late, reversal, or insufficient funds fees, where permitted by law.

9. No Refunds; Finality of Charges

No Refunds. All Charges are final and non-refundable except to the extent required by applicable law. This no-refund policy applies at all times, including without limitation if you terminate use, experience downtime or other interruptions, or are dissatisfied with the Service or generated content. Nothing in these Terms limits any non-waivable consumer rights provided by law.

10. Chargeback Policy; Dispute Procedure

10.1 Contact Us First. If you believe a charge is incorrect or unauthorized, you must contact support@bookengine.xyz within 30 days of the charge. Provide the date, amount, transaction ID, and a description of the issue. We will investigate in good faith and, if warranted by law or our policies, may issue a credit or adjustment.

10.2 Agreement Not to Initiate Chargebacks. To the maximum extent permitted by law, you agree not to initiate or request a payment reversal, chargeback, or similar dispute with your payment provider for Charges you authorized and for which you have not first pursued the dispute procedure in Section 10.1. You acknowledge that initiating a chargeback in violation of these Terms may constitute a breach.

10.3 Our Right to Contest Chargebacks. We may dispute any chargeback or reversal by providing the processor or issuer with documentation demonstrating your agreement to these Terms, your authorization of the transaction, and delivery of the Service.

10.4 Consequences. If you initiate or prevail in a chargeback contrary to these Terms, we may, to the extent permitted by law: (a) suspend or terminate access to the Service; (b) require repayment of amounts reversed; (c) assess a reasonable administrative fee for chargeback handling; (d) pursue collection efforts; and/or (e) condition reinstatement on payment of all outstanding amounts.

11. Subscriptions; Auto-Renewal; Cancellation

11.1 Auto-Renewal. If you enroll in a subscription plan, your subscription will automatically renew for successive billing periods unless canceled. You authorize recurring Charges to your payment method until you cancel.

11.2 Cancellation. You may cancel at any time effective at the end of the current billing period. Cancellation does not entitle you to a refund or credit for partial periods, except where required by law.

11.3 Subscription Modifications. You may upgrade or downgrade your subscription plan at any time. Upgrades take effect immediately and you will be charged a prorated amount for the remainder of your billing period. Downgrades take effect at the start of your next billing period.

11.4 Billing Cycle. Subscription billing cycles begin on the date of your initial subscription purchase and renew monthly on that same date. Book generation quotas reset at the beginning of each billing cycle.

12. Taxes

Charges are exclusive of taxes unless stated otherwise. You are responsible for all sales, use, VAT, GST, and similar taxes associated with your purchase and use of the Service, except for taxes based on our net income.

13. Third-Party Services

13.1 AI Providers. The Service relies on third-party artificial intelligence providers including Anthropic (Claude), OpenRouter, and OpenAI to generate book content. These providers may have their own terms of service and acceptable use policies. We are not responsible for the availability, accuracy, or content generated by these third-party AI systems.

13.2 Payment Processing. All payment transactions are processed by Stripe, Inc. Your use of Stripe's services is subject to the Stripe Services Agreement available at stripe.com/legal. We do not store your complete payment card information.

13.3 Third-Party Disclaimer. We do not control, endorse, or assume responsibility for any third-party services, and your use of such services is at your own risk. Any issues arising from third-party services should be directed to the respective provider.

14. Disclaimer of Warranties

14.1 "As Is" Basis. THE SERVICE IS PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED. TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, YMMV LLC DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO:

  • IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT
  • WARRANTIES THAT THE SERVICE WILL BE UNINTERRUPTED, ERROR-FREE, SECURE, OR FREE OF VIRUSES OR OTHER HARMFUL COMPONENTS
  • WARRANTIES REGARDING THE ACCURACY, RELIABILITY, COMPLETENESS, OR TIMELINESS OF GENERATED CONTENT
  • WARRANTIES THAT GENERATED CONTENT WILL MEET YOUR REQUIREMENTS OR EXPECTATIONS

14.2 AI Content Disclaimer. YOU ACKNOWLEDGE THAT AI-GENERATED CONTENT MAY CONTAIN ERRORS, INCONSISTENCIES, FACTUAL INACCURACIES, OR INAPPROPRIATE MATERIAL. YOU ASSUME ALL RISK AND RESPONSIBILITY FOR REVIEWING AND EDITING GENERATED CONTENT BEFORE USE, PUBLICATION, OR DISTRIBUTION.

14.3 No Professional Advice. Generated content does not constitute professional, legal, medical, financial, or any other form of advice. Do not rely on generated content for decisions requiring professional expertise.

15. Limitations of Liability

15.1 Exclusion of Damages. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL YMMV LLC, ITS OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, AFFILIATES, OR LICENSORS BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES, INCLUDING BUT NOT LIMITED TO:

  • Loss of profits, revenues, data, goodwill, or business opportunities
  • Business interruption or loss of business
  • Cost of substitute goods or services
  • Personal injury or property damage
  • Any damages arising from generated content, including claims of defamation, copyright infringement, or other third-party claims

ARISING OUT OF OR IN CONNECTION WITH THE SERVICE, THESE TERMS, OR YOUR USE OR INABILITY TO USE THE SERVICE, REGARDLESS OF THE THEORY OF LIABILITY (CONTRACT, TORT, STRICT LIABILITY, OR OTHERWISE) AND EVEN IF WE HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

15.2 Liability Cap. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, OUR TOTAL CUMULATIVE LIABILITY TO YOU FOR ALL CLAIMS ARISING OUT OF OR RELATING TO THESE TERMS OR THE SERVICE SHALL NOT EXCEED THE GREATER OF: (A) THE AMOUNTS YOU HAVE PAID TO US IN THE TWELVE (12) MONTHS PRECEDING THE CLAIM; OR (B) ONE HUNDRED U.S. DOLLARS ($100).

15.3 Essential Purpose. THE LIMITATIONS IN THIS SECTION APPLY EVEN IF ANY REMEDY FAILS OF ITS ESSENTIAL PURPOSE. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF CERTAIN DAMAGES, SO SOME OF THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU.

16. Indemnification

16.1 Your Indemnification Obligations. You agree to indemnify, defend, and hold harmless YMMV LLC and its officers, directors, employees, agents, affiliates, successors, and assigns from and against any and all claims, liabilities, damages, losses, costs, and expenses (including reasonable attorneys' fees and court costs) arising out of or related to:

  • Your use of the Service or any activities conducted through your account
  • Your inputs, generated content, or any content you publish or distribute
  • Your violation of these Terms or any applicable law or regulation
  • Your violation of any third-party rights, including intellectual property, privacy, or publicity rights
  • Any claims that your generated content is defamatory, obscene, or otherwise harmful

16.2 Procedure. We will provide you with prompt written notice of any claim subject to indemnification. You will have sole control over the defense and settlement of such claims, provided that you may not settle any claim that imposes liability on us without our prior written consent. We may participate in the defense at our own expense.

17. Force Majeure

Neither party shall be liable for any failure or delay in performing its obligations under these Terms (except payment obligations) where such failure or delay results from circumstances beyond the reasonable control of that party, including but not limited to: acts of God, natural disasters, pandemic or epidemic, war, terrorism, riots, civil unrest, government actions or orders, labor disputes, power failures, internet or telecommunications failures, cyberattacks, or failures of third-party AI providers or payment processors. If a force majeure event continues for more than 30 days, either party may terminate these Terms upon written notice.

18. Dispute Resolution; Arbitration; Class-Action Waiver

PLEASE READ THIS SECTION CAREFULLY. It requires binding arbitration on an individual basis and limits how you can seek relief from us.

18.1 Informal Resolution. Before filing a claim, you agree to first attempt to resolve the dispute by emailing support@bookengine.xyz with "Dispute" in the subject line and a description of your claim. If we cannot resolve within 30 days, either party may commence arbitration as set out below.

18.2 Agreement to Arbitrate. To the fullest extent permitted by law, any dispute, claim, or controversy arising out of or relating to these Terms or the Service (including Charges and billing) that cannot be resolved informally shall be resolved exclusively by binding arbitration on an individual basis, administered by the American Arbitration Association ("AAA") under its applicable rules (Consumer or Commercial). The Federal Arbitration Act ("FAA") governs the interpretation and enforcement of this Section.

18.3 Venue; Procedure. Arbitration shall be conducted by a single arbitrator. Unless you and we agree otherwise, the arbitration will occur remotely by video or, if an in-person hearing is required, in Nashville, Tennessee (or your U.S. county of residence for consumer disputes if required by AAA rules or law).

18.4 Class and Representative Action Waiver. All proceedings will be conducted solely on an individual basis and not in a class, consolidated, collective, or representative action. The arbitrator may award relief only in favor of the individual party seeking relief.

18.5 Small Claims Court. Either party may bring an individual action in small claims court instead of arbitration where jurisdictional requirements are satisfied.

18.6 Opt-Out. You may opt out of arbitration by sending written notice to YMMV LLC within 30 days of first accepting these Terms. Your notice must include your name, email, account ID (if any), and a clear statement that you opt out of arbitration.

18.7 Injunctive Relief; IP. Either party may seek temporary or preliminary injunctive relief in a court of competent jurisdiction to protect confidential information or intellectual property rights pending arbitration.

18.8 Severability. If any portion of this Section is found unenforceable, the remainder shall remain in effect; however, if the class waiver is found unenforceable, this entire Section 18 shall be unenforceable.

19. Termination

19.1 Termination by Us. We may terminate or suspend your access to the Service immediately, without prior notice, for any reason, including without limitation if you breach these Terms, engage in suspected fraudulent or abusive activity, fail to pay Charges when due, or if required by law.

19.2 Termination by You. You may terminate your account at any time by canceling your subscription (if applicable) and ceasing use of the Service. You may request deletion of your account by contacting support@bookengine.xyz.

19.3 Effect of Termination. Upon termination: (a) your right to access and use the Service immediately ceases; (b) you remain liable for all Charges incurred prior to termination; (c) we may delete your account data, including generated books, after a reasonable retention period; and (d) Sections that by their nature should survive termination will continue to apply, including payment obligations, no refunds, intellectual property rights, disclaimer of warranties, limitations of liability, indemnification, and dispute resolution.

20. International Users; Mandatory Rights

20.1 Jurisdictional Limitations. The Service is operated from the United States and is intended primarily for users located in the United States. We make no representations that the Service is appropriate or available for use in all jurisdictions. Access from jurisdictions where the Service or its content is illegal is prohibited.

20.2 Export Controls. The Service may be subject to U.S. export control and sanctions laws. You agree not to access or use the Service in violation of any U.S. export embargo, prohibition, or restriction.

20.3 Consumer Rights. Nothing in these Terms is intended to limit any non-waivable rights under the consumer protection laws of your jurisdiction. If you are a consumer in the European Union, United Kingdom, or other jurisdiction with mandatory consumer protection laws, those laws may apply to the extent they provide greater protections than these Terms.

21. Governing Law

Except to the extent the FAA governs Section 18, these Terms and any non-arbitrable disputes shall be governed by and construed in accordance with the laws of the State of Tennessee, United States, without regard to its conflict of law provisions. For claims not subject to arbitration, the federal and state courts located in Davidson County, Tennessee shall have exclusive jurisdiction.

22. Electronic Communications

22.1 Consent. By creating an account or using the Service, you consent to receive electronic communications from us, including emails regarding your account, transactions, service updates, and marketing (where permitted). You may opt out of marketing communications at any time.

22.2 Electronic Signatures. You agree that your electronic acceptance of these Terms (such as clicking "I Agree" or creating an account) constitutes your legally binding signature, equivalent to a handwritten signature.

22.3 Notice. Electronic communications from us to the email address associated with your account are deemed received when sent. It is your responsibility to keep your email address current.

23. Changes to Terms

23.1 Modifications. YMMV LLC may modify these Terms at any time. If a revision is material, we will provide notice (e.g., by email or in-product) at least 30 days before the new terms take effect.

23.2 Acceptance. Your continued use of the Service after the effective date of the revised Terms constitutes your acceptance of the changes. If you do not agree to the revised Terms, you must stop using the Service and may terminate your account.

23.3 Disputes Under Prior Terms. Disputes arising before the effective date of revised Terms shall be governed by the version of the Terms in effect at the time the dispute arose.

24. Miscellaneous

24.1 Entire Agreement. These Terms, together with the Privacy Policy and any other policies referenced herein, constitute the entire agreement between you and YMMV LLC regarding the Service and supersede all prior or contemporaneous understandings.

24.2 No Waiver. Our failure to enforce any right or provision of these Terms is not a waiver of such right or provision. Any waiver must be in writing and signed by an authorized representative of YMMV LLC.

24.3 Severability. If any provision of these Terms is held invalid, illegal, or unenforceable, the remaining provisions will remain in full force and effect. The invalid provision will be modified to the minimum extent necessary to make it valid and enforceable while preserving its intent.

24.4 Assignment. You may not assign or transfer your rights or obligations under these Terms without our prior written consent. Any attempted assignment in violation of this Section is void. We may assign these Terms without restriction, including in connection with a merger, acquisition, or sale of assets.

24.5 Notices. We may provide notices to you by email, in-product messages, or posting to the Service. Notices to us must be sent to support@bookengine.xyz and are effective upon confirmed receipt.

24.6 Headings. Section headings are for convenience only and do not affect the interpretation of these Terms.

24.7 Third-Party Beneficiaries. These Terms do not create any third-party beneficiary rights, except that our affiliates and licensors are intended third-party beneficiaries of the limitations of liability and disclaimers.

25. Contact Us

If you have any questions about these Terms, please contact us:

YMMV LLC
Email: support@bookengine.xyz

For legal notices, please include "Legal Notice" in the subject line.