Privacy

We collect almost nothing. This page explains exactly what, why, how long we keep it, and what you can do about it. Written for humans, not lawyers.

What we collect

The site uses no cookies, no analytics, no fingerprinting, and no third-party JavaScript. Every tool runs client-side in your browser. You can verify this in your browser's developer tools — the Network tab will only show requests to our own domain.

Optional localStorage is used only for in-browser preferences (for example, unit settings or last-used inputs). That data never leaves your device.

The only personal data we ever process is what you voluntarily send to hello@aifithub.io when you contact us — typically your email address and the contents of your message.

Lawful basis (Art. 6 GDPR)

For voluntary contact emails: your consent (Art. 6(1)(a) GDPR). Replying to you is also covered by Art. 6(1)(b) GDPR (steps taken at your request prior to entering a contract, where applicable).

Retention

Contact emails are kept for up to 12 months after the last reply, unless we have an ongoing relationship. You can ask us to delete sooner — see "Your rights" below.

Your rights (Art. 15-21 GDPR)

You have the right to:

• Access your data (Art. 15)
• Rectify inaccurate data (Art. 16)
• Erasure / "right to be forgotten" (Art. 17)
• Restrict processing (Art. 18)
• Data portability (Art. 20)
• Object to processing (Art. 21)
• Withdraw consent at any time (Art. 7(3))

Email hello@aifithub.io to exercise any of these. We aim to respond within 30 days.

Automated decision-making

We do not perform automated decision-making or profiling within the meaning of Art. 22 GDPR. Calculations on this site are deterministic math run in your browser; their output is shown to you, never used to make a decision about you.

Right to lodge a complaint

You can complain to the supervisory authority for North Rhine-Westphalia, Germany:

Landesbeauftragte für Datenschutz und Informationsfreiheit Nordrhein-Westfalen
Kavalleriestraße 2-4
40213 Düsseldorf
Germany
ldi.nrw.de

Data controller

The responsible party under Art. 4(7) GDPR is identified in the Impressum. Contact for any data-protection request: hello@aifithub.io.

Changes to this policy

If we ever change how the site processes data, we will update this page and note the change date here. Last reviewed: 8 May 2026.