Cookie Policy: Fibonacci
Translation notice: This is an English translation provided for convenience. The legally binding version is the Spanish one (Política de Cookies). In case of any discrepancy, the Spanish version prevails.
Last updated: November 15, 2026
1. What cookies are
Cookies and similar technologies (such as the browser's local storage) are small files that a website stores on your device to work or to remember information.
2. Cookies we use
Necessary (always on)
Essential for signing in, keeping things secure and paying. They cannot be turned off from the banner.
| Name | Provider | Purpose | Duration |
|---|---|---|---|
fib_sesion | Fibonacci | Keep you signed in and protect your account | 30 days |
fib_oauth | Fibonacci | Securely complete sign-in with Google | 15 minutes |
| Preferences (local storage) | Fibonacci | Remember your language and privacy choices | Until you change or delete them |
__cf_bm | Cloudflare | Security and bot protection | 30 minutes |
__stripe_mid, __stripe_sid | Stripe | Fraud prevention during payment | 1 year / 30 minutes |
Analytics (optional, off by default)
| Name | Provider | Purpose | Duration |
|---|---|---|---|
_ga, _ga_<ID> | Google Analytics 4 (via Google Tag Manager) | Measure, in aggregate, how the website and app are used | Up to 2 years |
Google Analytics is only activated if you accept it. We use Google's consent mode with all permissions denied by default. If you do not accept, no analytics cookies are set. We do not use advertising or remarketing cookies.
If you accept analytics, on the public website we also use Metricool and PostHog to count visits, and in the app, if you turn it on in Settings → Privacy, Cloudflare Web Analytics and PostHog. None of them sets cookies or stores data in your browser: they work only while the page is open, and they do not measure if your browser sends Global Privacy Control or Do Not Track. More details in the Privacy Policy (section 4 quinquies).
3. How to manage your preferences
- You can accept, reject or configure analytics in the cookie banner shown on your first visit.
- You can change your choice at any time from the "Cookie preferences" link in the footer or from Settings → Privacy.
- You can also block or delete cookies in your browser settings. If you block the necessary ones, you may not be able to sign in or pay.
Rejecting analytics does not affect any Fibonacci feature.
4. Contact
[email protected] (subject: "Privacy")