Cookie Policy
Last updated July 9, 2026
This policy describes the cookies and local browser storage used by the public 3ngram website, the hosted dashboard, and the MCP authorization flow. It supplements our Privacy Policy.
Marketing website
The public website stores the key 3ngram-theme in local storage when you select a light or dark theme. Local storage is not sent automatically with web requests.
We use Vercel Web Analytics for anonymous page-view and product-event aggregates and Vercel Speed Insights for web-performance measurements. Vercel Web Analytics does not use cookies or retain an identifier that follows you across websites. The site does not use advertising or cross-site tracking cookies.
Essential hosted-service cookies
These cookies are required for sign-in, signup verification, and OAuth request security. They cannot be disabled while using the corresponding feature.
| Cookie | Maximum duration | Purpose |
|---|---|---|
threengram_session | 30 days | HttpOnly hosted-dashboard session; actual expiry follows the server-issued token |
threengram_signup_proof | 7 days | HttpOnly proof that binds email verification to the browser that requested signup |
oauth_csrf | 10 minutes | HttpOnly double-submit token protecting the MCP OAuth authorization form |
Hosted-service cookies are SameSite=Lax, scoped to the required path, and marked Secure in production where applicable. Browser JavaScript cannot read the HttpOnly authentication cookies.
Payments and external services
Checkout and subscription management open Stripe-hosted pages. Stripe may use cookies on its own domains for fraud prevention, security, and payment processing under Stripe's policies. 3ngram does not receive your complete card details.
Managing storage
You can remove the theme preference through your browser's local-storage controls. You can delete cookies through browser settings, but removing an essential session cookie signs you out or interrupts the authorization flow. Because the marketing site does not set non-essential analytics cookies, it does not display a non-essential cookie-consent banner.
Changes
We will update this page before introducing a new cookie or materially changing its purpose.
Questions? Contact privacy@3ngram.ai. Also see our Privacy Policy and Terms of Service.