Cassie — Terms of Use

Last updated: 5 October 2026

These terms cover the Cassie web app, website and browser extension. By using Cassie you agree to them. Please also read the Privacy Policy.

Who can use Cassie

• Anyone can use Cassie on their own device without an account.
• Cassie accounts are for ages 13 and up. Younger students may use Cassie without an account, with a parent's or teacher's permission and help.

What Cassie is for

• Cassie is a study aid: explanations, practice, reviewers and notes.
• Don't use Cassie during tests, quizzes or other graded work, or to hand in work that isn't your own.
• Cassie uses AI, and AI can be wrong. Check important answers, especially for grades, health, money or legal matters. Cassie is not a doctor, lawyer or counsellor; in an emergency, contact local emergency services.

Your files and pictures

• Only attach files you're allowed to use. Cassie reads them to answer you; it doesn't publish them or show them to other people.
• Pictures Cassie makes are for your own study and projects.

Fair use

Free use without your own API key has daily limits so everyone gets a fair share. Don't try to get around limits (for example with throwaway emails or many accounts), misuse Cassie to harm others, or use it for anything illegal. We may block accounts or devices that do.

API keys and other services

If you add your own Groq or Google Gemini key, your use of those services also follows their terms. Cassie sends your questions to these AI services (or to Cassie's server, which passes them on) to get answers.

Paid plans

Cassie is free today. When paid plans launch, the price, how often you're billed, that the plan renews automatically until you cancel, and how to cancel will be shown right next to the subscribe button before you pay. You'll be able to cancel any time; your plan then stays active until the end of the period you paid for.

No guarantee

Cassie is provided "as is". We work to keep it running and accurate, but we can't promise it will always be available or error-free.

Changes

If these terms change, the date above changes. Continuing to use Cassie means you accept the updated terms.

Contact

Questions? Contact the developer at failanzahazel@gmail.com, or use Settings → Report a problem in the app.