# Deck Builder for Union Arena vs Tertia

The clearest difference is rating: Tertia at 5.0 against Deck Builder for Union Arena's 4.3. Tertia also leads on review sentiment (100% vs 64%) and in-app purchases (none vs 2). Deck Builder for Union Arena's advantage is ratings volume (72 vs 3) and iOS requirement (15.1 vs 26.2). On price, update cadence and device support there is nothing between them.

Both are free to download. Deck Builder for Union Arena sells 2 in-app purchases, starting at $4.99 per month. Tertia asks for nothing beyond the download.

Tertia holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Deck Builder for Union Arena has 72 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 64% of Deck Builder for Union Arena's written reviews are positive against 100% of Tertia's.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Deck Builder for Union Arena | Tertia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (72 ratings)](https://appshunter.io/ios/app/deck-builder-for-union-arena/id6563139619/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/tertia/id6764515108/reviews)** |
| Number of ratings | **72** | 3 |
| Positive reviews | 63.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | Weekly |
| Monetization | Free with in-app purchases | **Free** |
| Size | 80 MB | 10 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Nicholas Martin Geil](https://appshunter.io/developer/1757209176) | [Mark Martin](https://appshunter.io/developer/1581057549) |

## What reviewers say

### Deck Builder for Union Arena

[App page](https://appshunter.io/ios/app/deck-builder-for-union-arena/id6563139619)

This fan-made companion app helps you build, manage, and share decks for the Union Arena TCG. It features a comprehensive card database, TCGPlayer value integration, and the ability to buy cards directly within the app.

**Highlights:** Extensive card database, Deck building and management, Card scanning for collection, Community deck sharing, TCGPlayer value integration, Offline collection access

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Union Arena Pro | $4.99 | per month |
| Remove All Ads | $4.99 | one-time |


### Tertia

[App page](https://appshunter.io/ios/app/tertia/id6764515108)

A fast-paced card game where players identify sets of three cards based on matching or differing attributes. It offers various modes to train your eye, from instant feedback to timed challenges and daily puzzles.

**Highlights:** Pattern-matching card game, Four distinct game modes, Instant feedback in Practice mode, Timed challenges with combo multipliers, Daily puzzles for consistent play, Streak building for daily engagement

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Deck Builder for Union Arena free?

Deck Builder for Union Arena is free to download, with in-app purchases available.

### Is Tertia free?

Tertia is free to download, with no in-app purchases.

### Which has better reviews, Deck Builder for Union Arena or Tertia?

Tertia is rated higher. Deck Builder for Union Arena averages 4.3 out of 5 from 72 ratings, while Tertia averages 5.0 from 3 ratings.

### Do Deck Builder for Union Arena or Tertia have ads?

Deck Builder for Union Arena shows ads; Tertia does not.

### Which is updated more often, Deck Builder for Union Arena or Tertia?

Deck Builder for Union Arena ships an update weekly, and Tertia weekly. Most recently, Deck Builder for Union Arena was updated on October 24, 2026 and Tertia on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*