# Privacy Policy

Last updated: March 5, 2026

## 1. Introduction

This Privacy Policy explains how Fueling Optimizer ("we", "us", "our") collects, uses, stores, and shares personal data when you use our service ("Service").

## 2. Data We Collect

We may collect the following categories of data:

- Account data: email address, authentication metadata, session identifiers.
- Profile and preference data: language and calculator defaults/preferences.
- Input and calculation data: values submitted to fueling calculators and generated recommendation outputs.
- Technical data: IP address, user agent, timestamps, request logs, error logs.
- Payment/subscription metadata (if applicable): entitlement and transaction status data from payment providers.

We do not intentionally collect special categories of personal data unless you choose to provide them.

## 3. How We Use Data

We use data to:

- provide and maintain the Service;
- authenticate users and secure accounts;
- process fueling calculations and save preferences;
- enforce access controls and subscription entitlements;
- monitor, debug, and improve reliability and performance;
- comply with legal obligations and enforce terms.

## 4. Legal Bases (Where Applicable)

Depending on your location, we process data on one or more legal bases:

- performance of a contract;
- legitimate interests (security, fraud prevention, service improvement);
- legal obligations;
- consent (where required).

## 5. Cookies and Similar Technologies

The Service uses essential cookies/tokens for session management and CSRF protection.
Without these, core authenticated and form-based features may not function.

## 6. Sharing of Data

We may share data with:

- infrastructure and hosting providers;
- database, analytics, logging, and monitoring providers;
- payment processors (for subscription handling);
- legal authorities when required by law.

We do not sell personal data.

## 7. International Transfers

Your data may be processed in countries other than your own.
Where required, we implement appropriate safeguards for cross-border transfers.

## 8. Data Retention

We retain personal data only as long as necessary for the purposes described in this policy, including security, legal, accounting, and dispute-resolution needs.
Retention periods may vary by data category and legal requirements.

## 9. Security

We use reasonable technical and organizational measures to protect personal data.
No method of transmission or storage is 100% secure, and we cannot guarantee absolute security.

## 10. Your Rights

Subject to applicable law, you may have rights to:

- access your personal data;
- correct inaccurate data;
- delete data;
- restrict or object to processing;
- data portability;
- withdraw consent where processing is based on consent.

You may also have the right to lodge a complaint with a supervisory authority.

## 11. Children's Privacy

The Service is not directed to children under 13 (or older age thresholds where required by local law).
We do not knowingly collect personal data from children without appropriate legal basis.

## 12. Changes to This Policy

We may update this Privacy Policy from time to time.
We will post the updated version with a revised "Last updated" date.

## 13. Contact

For privacy requests or questions, contact:

- Email: mail@yannikwuenker.de
- Address: Loevenicher Weg 2b, 50933 Koeln

## 14. Important Note

This document is a general template and not legal advice.
Have qualified legal counsel review and adapt it for your jurisdiction, data flows, and vendor stack before production use.