Head-to-head mental math, right inside Messages.
Short version: Math Duel collects nothing. There are no accounts, no logins, no analytics, no ads, and no network connections of any kind.
Data we collect: None. Math Duel does not collect, store, transmit, or share any personal information or usage data.
How the game works: Game state — the puzzle seed and each player's score — is carried inside the iMessage you send, using Apple's Messages framework. It stays within your Messages conversation and is never sent to us or to any third party. Your in-progress round is stored only on your own device.
Children's privacy: The app collects no data from anyone, including children under 13.
Changes: If this policy ever changes, the updated version will be posted on this page.
Need help or have feedback? Get in touch and we'll get back to you.
How to play: In Messages, open a conversation, tap the Apps button, choose Math Duel, and send a duel. Tap the message to play — you and your friend race the same problems, and the higher score wins.
Last updated: 28 September 2026