# Auto Arena 3D vs ECHO LEGION

The clearest difference is in-app purchases: Auto Arena 3D at none against ECHO LEGION's 10. ECHO LEGION's advantage is update cadence (every 2 days vs weekly) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. ECHO LEGION sells 10 in-app purchases, starting at $2.99 per month. Auto Arena 3D asks for nothing beyond the download.

Auto Arena 3D ships an update weekly, ECHO LEGION every 2 days. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Auto Arena 3D | ECHO LEGION |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/echo-legion/id6816213177/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Weekly | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 339 MB | 104 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [minhyung kim](https://appshunter.io/developer/6791432506) | [Tatsuya Maeda](https://appshunter.io/developer/6792676878) |

## What reviewers say

### Auto Arena 3D

[App page](https://appshunter.io/ios/app/auto-arena-3d/id6804918554)

**In-app purchases:** none


### ECHO LEGION

[App page](https://appshunter.io/ios/app/echo-legion/id6816213177)

Build your own legion by recruiting defeated enemies as allies. Master strategic formations and unit placement to overcome stronger opponents. Develop your units and unlock new abilities to tackle various challenges.

**Highlights:** Recruit defeated enemies as allies, Strategic formation and unit placement, Develop and combine units, Unlock new abilities and playstyles, Cosmetic purchases only, no gacha

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 盟約（月額） | $2.99 | per month |
| おかえりパック | $2.99 | one-time |
| 覇者を越えたパック | $2.99 | one-time |
| ECHO PASS 凍てつく残響 | $5.99 | one-time |
| PASS+ へのアップグレード ・ はじまりの共鳴 | $9.99 | one-time |
| PASS+ へのアップグレード ・ 凍てつく残響 | $9.99 | one-time |
| 結晶 ×1,680 | $11.99 | one-time |
| ECHO PASS+ 凍てつく残響 | $14.99 | one-time |
| 結晶 ×2,550 | $19.99 | one-time |
| 結晶 ×9,600 | $59.99 | one-time |


## Frequently asked questions

### Is Auto Arena 3D free?

Auto Arena 3D is free to download, with no in-app purchases.

### Is ECHO LEGION free?

ECHO LEGION is free to download, with in-app purchases available.

### Do Auto Arena 3D or ECHO LEGION have ads?

Both Auto Arena 3D and ECHO LEGION show ads.

### Which is updated more often, Auto Arena 3D or ECHO LEGION?

Auto Arena 3D ships an update weekly, and ECHO LEGION every 2 days. Most recently, Auto Arena 3D was updated on October 29, 2026 and ECHO LEGION on October 31, 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.*