Modstack is now on the App Store

Modstack is live on the App Store for iPhone. Build tiny programs from large, readable command tiles, then watch a robot carry out your plan across 36 handcrafted circuits in six chapters.

Mirror and Repeat modifiers turn a small vocabulary into surprisingly large moves. Later circuits add ordered relays, switches, and gates, while the Daily Circuit offers a deterministic Easy, Medium, and Hard puzzle each day.

The Foundations chapter and Easy Daily Circuit are free. A single one-time purchase unlocks the remaining circuits and Daily difficulties. There are no ads, subscriptions, accounts, currencies, or tracking.

Download Modstack from the App Store or visit the Modstack page for gameplay details, support, accessibility information, privacy, and release notes.