# EST - Card Trios — A pattern puzzle, solo or duel

> A pattern puzzle, solo or duel (iPhone/iPad app by CENTAUR LABS OU.)

- Source: https://appshunter.io/ios/app/est-card-trios/id6806817604 (this page in markdown: same URL + `.md`)
- Developer: [CENTAUR LABS OU](https://appshunter.io/developer/1790899201)
- Category: Games, Card, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 8 MB
- Languages: American English
- Released: 2026-09-15
- Data updated: 2026-09-24
- User reviews in markdown: https://appshunter.io/ios/app/est-card-trios/id6806817604/reviews.md

## What is EST?

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 across two devices over Game Center. 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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Support EST | $9.99 | one-time |



## Version history (last 2 releases)

### 1.0.2 — 2026-09-17

Sound effects no longer stop your music or podcast. Thanks to Leo Lobato for the report.

Duel fixes.

The table no longer fades while nobody holds a claim. Cards stay at full brightness from the first deal.

Playing across two devices, your opponent's card count was drawn upside down. It sits upright now.

If your opponent leaves after the last set, you keep the result card. If they leave mid-game, the notice shows the scores so far.

With three or four players, the others keep playing when one leaves. The leave dialog now says so.

### 1.0.0 — 2026-09-15

No release notes.

## More apps by CENTAUR LABS OU

- [Starpath](https://appshunter.io/ios/app/starpath/id6759219160)
- [Cartogram](https://appshunter.io/ios/app/cartogram/id6760616439)

All apps by CENTAUR LABS OU: https://appshunter.io/developer/1790899201

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-24.*