Terms of Service

Last updated: April 18, 2026

These Terms of Service ("Terms") govern your access to and use of Blind Bench (the "Service"), operated by Mogil Ventures, LLC ("Blind Bench", "we", "us"). By creating an account, signing in, or otherwise using the Service — including as an anonymous reviewer invited through a shareable evaluation link — you agree to these Terms. If you do not agree, do not use the Service.

1. Who can use the Service

You must be at least 18 years old and capable of forming a binding contract. If you use the Service on behalf of an organization, you represent that you have authority to bind that organization to these Terms, and "you" refers to both you and the organization.

2. Accounts

You can authenticate using Google OAuth or a magic link sent to your email. You are responsible for maintaining the confidentiality of your account, for all activity that occurs under it, and for promptly notifying us of any unauthorized access. You must provide accurate information and keep it up to date.

3. Bring Your Own Key (BYOK)

The Service is designed to call large language models through OpenRouter or comparable providers using an API key that you provide ("BYOK Key"). By adding a BYOK Key, you represent that:

• You have the right to use that key and are authorized to incur charges on it.
• You will comply with the terms and acceptable use policies of the underlying LLM provider (including OpenRouter, Anthropic, OpenAI, Google, and any others).
• You bear sole responsibility for all charges, rate limits, content policy violations, and provider-side consequences arising from model usage initiated through your key.

We encrypt BYOK Keys at rest and never return them in plaintext. We make no warranty that any LLM provider will remain available or that its pricing will remain stable.

4. User Content

"User Content" means prompts, prompt versions, test cases, variables, meta context, evaluations, annotations, feedback, and any other material you or your collaborators submit to the Service.

• Ownership. You retain all rights in your User Content.
• License to us. You grant Blind Bench a worldwide, non-exclusive, royalty-free license to host, store, reproduce, transmit, display, and process User Content solely as necessary to operate, maintain, and improve the Service for you.
• Reviewer annotations. Annotations submitted through blind evaluation links become part of the User Content of the project that invited the reviewer.
• No training. We do not use your User Content to train machine-learning models without your separate written consent.
• Accuracy of outputs. Outputs produced by LLMs through the Service are probabilistic and may be inaccurate, biased, or unsuitable for a given purpose. You are responsible for reviewing outputs before relying on them, and you must not use outputs as a substitute for professional (medical, legal, financial, or safety-critical) advice.

5. Acceptable use

You will not, and will not permit any user or reviewer to:

• Use the Service to violate any law, regulation, or third-party right (including intellectual property and privacy rights).
• Submit User Content that infringes, defames, harasses, or is obscene, or that contains personal information of others without a lawful basis.
• Attempt to probe, scan, bypass, or disrupt the security or integrity of the Service, or extract data beyond what is exposed to you by the product.
• Attempt to de-anonymize blind evaluations, correlate reviewer annotations with version identifiers outside of the tools provided, or otherwise subvert the blind-evaluation guarantees of the Service.
• Use automated means to scrape, reverse-engineer, or re-host material portions of the Service.
• Resell, sublicense, or provide the Service to third parties except as a feature expressly supported by the product (for example, inviting collaborators to an organization).

6. Blind evaluation and reviewer obligations

If you are invited as a reviewer through a shareable evaluation link, you agree that:

• You will not attempt to determine the model, version, or author behind any blinded output.
• You will submit only your own, good-faith annotations.
• You will not share the evaluation link publicly unless the inviter has authorized public distribution.
• The inviter controls your access and may revoke it at any time.

7. Intellectual property

All right, title, and interest in and to the Service (excluding User Content) — including its source code, designs, brand, copy, and underlying technology — are and remain the exclusive property of Blind Bench and its licensors. No rights are granted except as expressly set forth in these Terms. You may provide feedback or suggestions; if you do, you grant us an unrestricted, perpetual, royalty-free license to use them without obligation to you.

8. Third-party services

The Service relies on third-party providers, including, without limitation: Google (authentication), Resend (magic-link email), Convex (database and serverless backend), Vercel (hosting), PostHog (analytics and session replay), and OpenRouter and downstream LLM providers (model inference). Your use of those services through Blind Bench is also governed by the terms and policies of the respective providers. We are not responsible for their acts or omissions.

9. Fees, billing, and free beta

The Service may currently be offered at no charge or on a beta basis. We may introduce paid plans in the future; if we do, we will give you reasonable notice before any charges apply to you, and continued use of paid features after the effective date constitutes acceptance of the then-current fees. BYOK usage charges levied by LLM providers are separate and are your responsibility regardless of the status of our own pricing.

10. Confidentiality

Each party will protect the other's non-public information disclosed in connection with the Service using at least the same degree of care it uses for its own similar information, and in no event less than a reasonable standard of care. This obligation survives termination.

11. Disclaimers

THE SERVICE IS PROVIDED "AS IS" AND "AS AVAILABLE". TO THE FULLEST EXTENT PERMITTED BY LAW, BLIND BENCH DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED, ERROR-FREE, OR SECURE, OR THAT LLM OUTPUTS WILL BE ACCURATE, RELIABLE, OR SUITABLE FOR ANY PURPOSE.

12. Limitation of liability

TO THE FULLEST EXTENT PERMITTED BY LAW, BLIND BENCH AND ITS AFFILIATES WILL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES, OR FOR LOST PROFITS, LOST REVENUES, LOST DATA, OR BUSINESS INTERRUPTION, ARISING OUT OF OR RELATING TO THE SERVICE OR THESE TERMS, WHETHER OR NOT FORESEEABLE AND REGARDLESS OF THE BASIS OF LIABILITY. OUR AGGREGATE LIABILITY ARISING OUT OF OR RELATING TO THESE TERMS OR THE SERVICE WILL NOT EXCEED THE GREATER OF (A) THE AMOUNTS YOU PAID TO US IN THE TWELVE MONTHS PRECEDING THE EVENT GIVING RISE TO THE CLAIM AND (B) ONE HUNDRED U.S. DOLLARS ($100). Some jurisdictions do not allow the exclusion or limitation of certain damages; in those jurisdictions these limitations apply to the fullest extent permitted.

13. Indemnification

You will defend, indemnify, and hold harmless Blind Bench and its affiliates, officers, employees, and agents from and against any claim, demand, loss, liability, or expense (including reasonable attorneys' fees) arising out of or related to (a) your User Content, (b) your use of the Service, including any LLM usage incurred under your BYOK Key, (c) your violation of these Terms, or (d) your violation of any third-party right.

14. Termination

You may stop using the Service at any time. We may suspend or terminate your access at any time for any reason, including if we believe you have violated these Terms or if we discontinue the Service. Upon termination, your right to use the Service ceases immediately; sections that by their nature should survive termination (including Sections 4, 7, 10, 11, 12, 13, and 16) will survive.

15. Changes

We may update these Terms from time to time. If changes are material, we will provide reasonable notice — for example, by email to the address on your account or by posting a notice in the Service — before the changes take effect. Continued use of the Service after the effective date constitutes acceptance of the updated Terms.

16. Governing law and disputes

These Terms are governed by the laws of the State of Delaware, without regard to its conflict-of-laws principles. The parties consent to the exclusive jurisdiction of the state and federal courts located in Delaware for any dispute not subject to arbitration. Nothing in this Section prevents either party from seeking injunctive relief in any court of competent jurisdiction to protect its intellectual property or confidential information.

17. Miscellaneous

These Terms are the entire agreement between you and Blind Bench regarding the Service and supersede any prior agreement. If any provision is held unenforceable, the remaining provisions remain in full force. Our failure to enforce any provision is not a waiver. You may not assign these Terms without our prior written consent; we may assign them without restriction. Nothing in these Terms creates a partnership, agency, or employment relationship.

18. Contact

Questions about these Terms: hello@blindbench.dev. Security reports: security@blindbench.dev. Mogil Ventures, LLC.