Cookie Policy
Last updated: October 27, 2025
1. What Are Cookies?
Cookies are small text files stored on your device (computer, smartphone, tablet) when you visit a website. They help websites remember your preferences and improve your experience.
Calc618 uses minimal cookies to provide essential functionality. We do not use tracking cookies for advertising.
2. Cookies We Use
2.1 Essential Cookies (Required)
These cookies are necessary for the Service to function and cannot be disabled:
Authentication Cookies
- Purpose: Keep you logged in to your account
- Provider: Supabase Auth
- Duration: 7 days (refreshed on activity)
- Data: Encrypted session token
Browser LocalStorage (Not Technically Cookies)
- Purpose: Save your calculator preferences (fees, TP/SL levels, defaults)
- Storage: Browser localStorage
- Duration: Until you clear browser data
- Data: User settings (e.g., default leverage, fee structure)
2.2 Analytics Cookies (Minimal)
We may use minimal analytics to understand how the Service is used:
Usage Analytics (Privacy-Focused)
- Purpose: Understand which features are used most
- Provider: Self-hosted or privacy-focused analytics (no third-party tracking)
- Data: Page views, feature usage (no personal identifiers)
- IP Anonymization: Yes
- Duration: Session-based
We DO NOT use:
- Advertising cookies
- Social media tracking pixels
- Third-party marketing cookies
- Cross-site tracking of any kind
3. Third-Party Cookies
3.1 Donation Widget (NOWPayments)
If you click the "Donate" button, the NOWPayments widget may set cookies. These are controlled by NOWPayments and subject to their privacy policy. We do not have access to these cookies.
3.2 External Links
Links to external sites (e.g., blog references, exchange links) may set their own cookies. We are not responsible for third-party cookie policies.
4. How to Control Cookies
4.1 Browser Settings
You can control cookies through your browser settings:
- Chrome: Settings → Privacy and security → Cookies
- Firefox: Settings → Privacy & Security → Cookies and Site Data
- Safari: Preferences → Privacy → Cookies
- Edge: Settings → Cookies and site permissions
4.2 Clear Browser Storage
To delete your saved preferences (localStorage):
- Open browser developer tools (F12)
- Go to "Application" or "Storage" tab
- Find "Local Storage" → calc618.com
- Delete all items
Note: Clearing cookies will log you out and reset your preferences.
4.3 Disable Cookies
You can disable all cookies in your browser settings. However:
- You will not be able to stay logged in
- Your preferences will not be saved
- Some features may not work properly
5. Data Security
Cookies and localStorage data are:
- Encrypted: Authentication tokens are encrypted
- Secure: Transmitted over HTTPS only
- HttpOnly: Session cookies are not accessible via JavaScript (prevents XSS attacks)
- SameSite: Cookies are scoped to Calc618 domain only (prevents CSRF attacks)
6. Cookie Retention
| Cookie Type | Duration |
|---|---|
| Authentication | 7 days (auto-renewed) |
| Preferences (localStorage) | Until manually cleared |
| Analytics (if used) | Session only |
7. Updates to Cookie Policy
We may update this Cookie Policy as we add new features or improve the Service. Check the "Last Updated" date at the top. Significant changes will be announced on the website.
8. Contact Us
Questions about cookies? Contact us at info@calc618.com.
ℹ️ Summary
Calc618 uses minimal cookies:
- Essential authentication (if you have an account)
- Browser storage for your preferences
- No advertising or tracking cookies
- No cross-site tracking
- You can delete all data anytime