Last updated: April 17, 2026
By accessing or using Underfiction ("the Service"), operated at underfiction.com, you agree to be bound by these Terms of Service. If you do not agree, do not use the Service.
Underfiction is an AI-powered interactive fiction platform. You provide input and AI models generate narrative prose in response. The Service uses third-party AI inference providers to generate content.
You must be at least 18 years old to use the Service. By creating an account, you confirm that you are 18 or older.
Content generated by the Service is produced by large language models (LLMs). While the Service does not apply automated content filters, all use remains subject to the Acceptable Use policy in Section 7. You acknowledge and agree that:
AI-generated content may be inaccurate, inappropriate, offensive, or otherwise unexpected. Generated content does not represent the views, opinions, or endorsements of Underfiction or its operators. You are solely responsible for how you use, share, or publish any content generated through the Service. AI models are non-deterministic — the same input may produce different output on different occasions. We make no warranties regarding the quality, accuracy, creativity, or suitability of any generated content.
You may create an account using email and password, Google, or Apple sign-in. You are responsible for maintaining the security of your account credentials. You must provide accurate information and promptly update it if it changes.
You may delete your account at any time from your account settings. Deletion removes your account data, usage records, and any cloud-synced content from our servers. Locally stored data remains in your browser until you clear it. Account deletion is permanent and cannot be undone.
The Service operates on a pay-per-use system using credits, an in-app currency. Credits are purchased in advance and consumed as you use the Service.
Credit purchases are processed by Stripe. By purchasing credits, you also agree to Stripe's terms. Credit purchases are non-refundable except where required by applicable law. We reserve the right to modify credit pricing at any time. Existing purchased credits will not be affected by price changes. Unused credits do not expire while the Service is operational. In the event the Service is discontinued, we will provide reasonable notice and, where feasible, an opportunity to use remaining credits.
You agree not to use the Service to:
Generate content that depicts the sexual exploitation or abuse of minors. Generate content for the purpose of harassing, threatening, or intimidating real individuals. Attempt to reverse-engineer, exploit, or attack the Service or its infrastructure. Resell, redistribute, or commercially exploit AI-generated output as an automated service. Violate any applicable law or regulation.
We reserve the right to suspend or terminate accounts that violate these terms without prior notice or refund.
You retain ownership of the input you provide. AI-generated output is provided as-is. We make no claim of ownership over generated content, but we also make no guarantee of its originality or that it does not infringe on third-party rights. You are responsible for ensuring your use of generated content complies with applicable intellectual property laws.
By default, story content is stored locally in your browser or app. We do not maintain server-side copies unless you enable story sync, in which case stories are stored on our servers encrypted at rest using a per-user key. You can delete cloud-synced stories from your account settings at any time.
You acknowledge that clearing your browser data, switching browsers, or using a different device may result in loss of locally stored content. We are not responsible for any data loss resulting from browser storage limitations, clearing, or corruption. It is your responsibility to back up any content you wish to preserve.
To the maximum extent permitted by applicable law, Underfiction and its operators shall not be liable for any indirect, incidental, special, consequential, or punitive damages, including but not limited to loss of data, loss of profits, or damages arising from use of or inability to use the Service, any content generated by the Service, unauthorized access to or alteration of your data or transmissions, loss of locally stored or cloud-synced content, or any third-party conduct or content including AI inference providers.
The Service is provided "as is" and "as available" without warranties of any kind, whether express or implied.
The Service relies on third-party providers for AI inference, payment processing, and authentication. We are not responsible for the availability, performance, or policies of these third-party services. Your use of the Service constitutes acceptance of the terms and privacy practices of these providers insofar as they apply to your use.
We do not guarantee uninterrupted or error-free operation of the Service. We may modify, suspend, or discontinue any part of the Service at any time without prior notice. We are not liable for any modification, suspension, or discontinuation.
We may update these Terms at any time. Continued use of the Service after changes are posted constitutes acceptance of the revised Terms. We encourage you to review this page periodically.
These Terms shall be governed by and construed in accordance with the laws of Switzerland. Any disputes arising from these Terms or the Service shall be subject to the exclusive jurisdiction of the courts of Zürich, Switzerland.
If you have questions about these Terms, you can reach us at [email protected] or through our Discord.