Privacy & data
The short version: no accounts, no analytics, no tracking. Here’s the complete picture.
What stays on your machine
Section titled “What stays on your machine”Everything you create lives in local storage on your device — your decks, preferences, theme choice, and the marker that lets you reconnect to an in-progress game. Nothing is uploaded or synced. The flip side: clearing site/app data deletes your decks, so export the ones you care about.
What the relay sees
Section titled “What the relay sees”Multiplayer goes through a relay server (the public one, or your own). While you play, the relay handles your chosen username, the room name, and the game messages it forwards between players. It keeps the current game state in memory so disconnected players can rejoin. All of it is in-memory only — when the room closes, it’s gone. Nothing is written to a database. Like any server, it keeps short-lived operational logs.
What leaves your machine
Section titled “What leaves your machine”The client talks to exactly two third-party services:
- Scryfall — card data and card images, fetched anonymously at runtime (their privacy policy).
- Commander Spellbook — when you use combo analysis in the deck editor, the card names in your deck are sent to their API to find combos.
That’s the list. No analytics, no telemetry, no crash reporting, no ad or font CDNs (fonts are bundled). The desktop app does not phone home or auto-update.
Questions
Section titled “Questions”This page describes what the code does as of when it was written. The code is the authority — it’s all open, and questions are welcome on Discord.