Donate

Keep the deck free

Stephan von Falkenstein and Sophia at a cafe table, coffee in hand, making a heart with their hands.
Stephan von Falkenstein and Sophia — the two who built it. A coffee is genuinely about the size of it.

Mars Deck is free, carries no advertising and tracks nobody. If you want it to stay that way, this is how you help.

What it actually pays for

Two things, and they are the only two that cost anything. The server that holds the map, and the engine behind Ask the Deck — every question put to it is a real bill, which is why there is a daily ceiling on it rather than a surprise at the end of the month. Everything else here is computed in your own browser and costs us nothing to give away.

This buys nothing, and that is deliberate. No tier, no features, no badge. If you want Deck Pro — watchlists, calendar export, saved answers — Founding is €29 once and gets you all of it for life. That is better value than any amount on this page.

Vonfal AI is a business rather than a registered charity, so donations here are not tax-deductible.

Chip in

€3 A coffee Covers a day of serving the map.
€7 A round Covers a week, and a few hundred questions asked of the deck.
€15 A good one Covers a month of everything, comfortably.
€

Payment is confirmed with PayPal by our own server before anything is recorded — your browser is never trusted to say money moved, and the same payment can never be counted twice. We are not sent your card details at any point, and we do not ask for or store your name or email. PayPal will have an email address for you; we do not receive it.