Privacy

Contact messages

Contact form details are sent by email to Joke H. van Velzen and are not stored in the website database. They are used only to respond to the message.

Analytics

Optional PostHog analytics may be enabled by the site owner. Data is sent only after you accept analytics, using PostHog Cloud EU, to understand website navigation, article engagement, and PDF use. The site does not intentionally send names, email addresses, payment information, form values, article contents, or complete URLs to PostHog.

You can reject analytics or change your choice later through Cookie settings. Session recording is separately disabled by default; if enabled after an additional review, it starts only after consent and masks inputs and sensitive elements. Analytics is intended to be retained for no more than 12 months, subject to the project setting. You can contact the site owner to ask about deletion where applicable.

Support payments

If you choose to contribute, you are redirected to Stripe. Stripe processes the payment and payment information; Sigmetack does not receive or store card or online-banking credentials. Stripe’s own privacy terms apply during checkout.