Cookie Policy

Last updated: 12/10/2025

1. What is a Cookie?

A cookie is a small text file stored on your device (computer, smartphone, tablet) when you visit a website. Cookies allow the site to recognize your device and remember certain information about your preferences or actions.

Guthly uses cookies and similar technologies (localStorage, sessionStorage) to improve your experience and ensure the proper functioning of the Service.

2. Types of Cookies Used

2.1 Strictly Necessary Cookies

✓ Essential Cookies (no consent required)

These cookies are essential for the Service to function and cannot be disabled.

Authentication Session (NextAuth)

  • Purpose: Maintain your logged-in session
  • Duration: Session (deleted when browser closes)
  • Cookies: next-auth.session-token, next-auth.csrf-token

CSRF Security

  • Purpose: Protection against CSRF attacks
  • Duration: Session

Interface Preferences

  • Purpose: Remember your theme (light/dark) and display preferences
  • Duration: 1 year
  • Storage: localStorage (theme, date-selection)

2.2 Functional Cookies

Consent recommended

These cookies enhance your user experience but are not strictly necessary.

User Preferences

  • Purpose: Remember your preferences (language, filters, sorting)
  • Duration: 6 months
  • Storage: localStorage

Application State

  • Purpose: Remember interface state (menus open/closed, last visited page)
  • Duration: Session
  • Storage: sessionStorage

2.3 Performance Cookies

Consent required

These cookies collect information about Service usage.

Usage Analytics (if enabled)

  • Purpose: Understand how you use Guthly to improve it
  • Data collected: Pages visited, visit duration, actions performed (anonymized)
  • Duration: 13 months maximum
  • Third-party service: Potentially Google Analytics, Plausible or similar

Error Monitoring

  • Purpose: Detect and fix bugs
  • Data: Error messages, stack traces (anonymized)
  • Duration: 90 days

2.4 Third-Party Cookies

Stripe (Payments)

  • Purpose: Secure payment processing, fraud prevention
  • Cookies: __stripe_mid, __stripe_sid
  • Duration: 1 year (mid), 30 minutes (sid)
  • Policy: stripe.com/privacy

OAuth Providers (Google, etc.)

  • Purpose: Authentication via third-party services
  • Cookies: Depends on provider (Google, GitHub, etc.)
  • Duration: Varies by provider

CDN and Hosting

  • Purpose: Content distribution, security (DDoS), performance
  • Providers: Vercel, Cloudflare
  • Cookies: __cf_bm, __cfduid (Cloudflare)

3. How to Manage Your Cookies

3.1 Application Settings

You can manage your cookie preferences directly in your Guthly account (Privacy section).

3.2 Browser Settings

You can configure your browser to:

  • Block all cookies
  • Accept only first-party cookies
  • Delete existing cookies
  • Be notified before cookies are stored

Guides by browser:

⚠️ Warning

Blocking certain cookies may affect Guthly's functionality. Strictly necessary cookies cannot be disabled without preventing use of the Service.

3.3 Global Management Tools

4. Cookie-Like Technologies

4.1 Local Storage

Guthly uses your browser's localStorage to store locally:

  • Your theme preferences (light/dark)
  • The selected date in the interface
  • React Query cache (for performance)
  • Certain display preferences

Unlike cookies, localStorage has no expiration date and remains until manually deleted.

4.2 Session Storage

sessionStorage is used for temporary data related to your browsing session (deleted when the tab is closed).

5. "Do Not Track" Signal

Some browsers offer a "Do Not Track" (DNT) signal. Currently, there is no industry standard on how to respond to this signal. Guthly will respect this signal if a clear standard is established.

6. GDPR and ePrivacy Compliance

Guthly complies with European regulations:

  • GDPR (General Data Protection Regulation): Your rights regarding your personal data
  • ePrivacy Directive: Consent for non-essential cookies

Legal basis for cookie usage:

  • Essential cookies: Legitimate interest (Article 6.1.f GDPR)
  • Functional and analytics cookies: Consent (Article 6.1.a GDPR)

7. Cookie Retention Period

Cookie TypeMaximum Duration
Authentication sessionSession (until browser closes)
User preferences6 months
Theme and display1 year
Analytics13 months maximum
Stripe (payment)1 year (fraud detection)

In accordance with CNIL recommendations, cookie duration is limited to 13 months maximum.

8. Updates to This Policy

This cookie policy may be updated to reflect changes in our practices or for legal reasons. The "Last updated" date at the top of this page will be modified.

For major changes, we will inform you by notification in the application or by email.

9. Questions and Contact

For any questions regarding our use of cookies, contact us:

Email: hello@eguth.io

Address: 20 rue de Bucarest, 75008 Paris, France

© 2025 Eguth. All rights reserved.