# Zero21 Card Game vs Train Out

The clearest difference is rating: Train Out at 4.7 against Zero21 Card Game's 4.0. Train Out also leads on update cadence (every 11 days vs every 65 months) and ratings volume (24 vs 3). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Train Out holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Train Out has 24 ratings behind it against 3, so its average is the more settled of the two.

Zero21 Card Game ships an update every 65 months, Train Out every 11 days. The most recent releases landed on October 14, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Zero21 Card Game | Train Out |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (3 ratings)](https://appshunter.io/ios/app/zero21-card-game/id1550265606/reviews) | **[4.7 (24 ratings)](https://appshunter.io/ios/app/train-out/id6749274723/reviews)** |
| Number of ratings | 3 | **24** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 65 months | **Every 11 days** |
| Monetization | Ad-supported | Ad-supported |
| Size | 58 MB | 126 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Le Nhung](https://appshunter.io/developer/1436505077) | [Samet Ersan](https://appshunter.io/developer/1554084187) |

## What reviewers say

### Zero21 Card Game

[App page](https://appshunter.io/ios/app/zero21-card-game/id1550265606)

This number puzzle game challenges you to keep your score between 0 and 21 by collecting cards. Utilize power-up cards and strategic choices to navigate diverse levels and daily challenges. It's a fun, relaxing way to train your brain.

**Highlights:** Keep score between 0 and 21, Collect number cards, Use power-up cards, Unlock new card collections, Daily challenges, Diverse card layouts

**Features:** macOS Compatibility

**In-app purchases:** none


### Train Out

[App page](https://appshunter.io/ios/app/train-out/id6749274723)

Guide trains of matching colors through a grid to pick up passengers. Once full, the train can exit through its tunnel. Plan your moves carefully to solve increasingly complex puzzles.

**Highlights:** Color-matching puzzles, Train pathfinding, Passenger pickup, Grid-based strategy, Increasing difficulty, Tunnel escape

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Zero21 Card Game free?

Zero21 Card Game is free to download, with no in-app purchases.

### Is Train Out free?

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

### Which has better reviews, Zero21 Card Game or Train Out?

Train Out is rated higher. Zero21 Card Game averages 4.0 out of 5 from 3 ratings, while Train Out averages 4.7 from 24 ratings.

### Do Zero21 Card Game or Train Out have ads?

Both Zero21 Card Game and Train Out show ads.

### Which is updated more often, Zero21 Card Game or Train Out?

Zero21 Card Game ships an update every 65 months, and Train Out every 11 days. Most recently, Zero21 Card Game was updated on October 14, 2026 and Train Out on October 24, 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.*