EST - Card Trios
A pattern puzzle, solo or duel
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Twelve cards on the table, and three of them fit together. Spot the trio before the clock runs out. Play solo, share one phone, or link two devices, even offline.
Twelve cards sit on the table. Three of them fit together. Your job is to see which three before the clock runs out.
EST is a free card game about patterns. The deck has 81 cards, and every card combines a count, a color, a shape, and a fill. Three cards make a set when each trait is the same on all three or different on all three. If one trait splits two-and-one, they are not a set.
THREE WAYS TO PLAY
• Solo 81: clear the whole deck against the clock. Play a run without hints and your best time goes to the Game Center leaderboard.
• Quick 27: the 27 solid cards, nine on the table, for a shorter round.
• Duel: race someone on one phone, or on two devices. Play online over Game Center, or offline over Wi-Fi and Bluetooth when you have no signal. On iPad, four players share one table.
LEARN THE RULE
A six-step tutorial walks you through the four traits, a set that works, a set that does not, and a practice board. Open it again any time from the rules screen.
EXPLORE THE MATH
Every card is a point in four-dimensional space and every set is a line. Build a card from its four base-3 coordinates, then see which card completes any pair you pick.
MAKE IT YOURS
Pick a color theme and a fill style. Turn sound and haptics off when you want quiet.
EST has no ads and no subscription, and nothing in the game is locked. There is one optional support purchase. It pays for maintenance and gives you a supporter mark, the Dusk card colors, a warm background setting, and early TestFlight builds when they are available.
EST is open source. It is inspired by SET, the card game created by Marsha Falco, but uses its own name, artwork, and code. EST is not affiliated with, sponsored by, or endorsed by the makers of SET.
Made for iPhone and iPad by Michell Zappa at Centaur Labs.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Two devices can now play without internet, so a duel works on a plane or on the subway. Tap Duel offline on both. One of you hosts a table and the other joins it. The devices connect over Wi-Fi and Bluetooth, and you don't need a Game Center account.
On iPad, tap Party offline and up to four players can join one table.
The Game Center option is now called Duel online. It works the same as before.
New training mode: Is this a set? It shows three cards, you answer, and it explains each trait. Most wrong answers are near misses, where one trait breaks the set. Your best streak is saved.
In a two-device duel, the board now stays put when someone presses SET.
The developer, CENTAUR LABS OU, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- CENTAUR LABS OU
- Size
- 8.2 MB
- Category
- Puzzle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Support EST $9.99
- Copyright
- © 2026 Michell Zappa
