Terms of Service

Last updated: May 21, 2026

1. Acceptance

By installing or using the ProfessorAi Chrome extension or visiting professorai.com ("Service"), you agree to these Terms of Service ("Terms"). If you do not agree, do not use the Service.

2. Description of Service

ProfessorAi is a Chrome browser extension that provides AI-generated explanations for text selected on web pages. The Service uses Anthropic's Claude API to generate responses. Explanations are for informational purposes only and should not be relied upon as professional legal, medical, financial, or other expert advice.

3. Free tier

The free tier provides up to 10 AI explanations per day with no account required. We reserve the right to change the free tier limits at any time with reasonable notice.

4. Pro subscriptions and payments

Pro subscriptions are billed monthly or annually as selected at checkout. Payments are processed by Stripe. All sales are final; we do not offer refunds except as required by applicable law. You may cancel your subscription at any time; cancellation takes effect at the end of the current billing period.

Lifetime access is a one-time purchase that entitles you to all Pro features for as long as the Service exists. We do not guarantee the Service will operate indefinitely.

5. Acceptable use

You agree not to:

• Use the Service to generate or disseminate harmful, illegal, or fraudulent content
• Attempt to reverse-engineer, bypass, or abuse the API rate limits or authentication
• Use the Service in any way that violates applicable laws or regulations
• Resell or sublicense access to the Service without our written consent
• Use automated scripts to make bulk requests to the API

6. Intellectual property

The ProfessorAi extension, website, and all associated branding are owned by ProfessorAi. AI-generated explanations are provided for personal use. You may copy individual explanations for personal, non-commercial use.

7. Disclaimer of warranties

The Service is provided "as is" without warranties of any kind. We do not warrant that explanations are accurate, complete, or suitable for any purpose. AI models can make mistakes. Always verify important information with authoritative sources.

8. Limitation of liability

To the maximum extent permitted by law, ProfessorAi shall not be liable for any indirect, incidental, special, consequential, or punitive damages arising from your use of the Service. Our total liability shall not exceed the amount you paid us in the 12 months preceding the claim.

9. Changes to terms

We may update these Terms. Continued use of the Service after changes constitutes acceptance. We will update the "Last updated" date above when changes are made.

10. Governing law

These Terms are governed by the laws of the jurisdiction in which ProfessorAi is registered, without regard to conflict of law principles.

11. Contact

Questions? Email hello@professorai.com.