# Echo Step vs Model Engine Builder

The clearest difference is in-app purchases: Echo Step at none against Model Engine Builder's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Model Engine Builder sells 1 one-off in-app purchase. Echo Step asks for nothing beyond the download.

## The numbers

| Metric | Echo Step | Model Engine Builder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | — | Every 2 weeks |
| Size | 16 MB | 20 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [JOO HYUN SUNG](https://appshunter.io/developer/1438003962) | [MIN GYu OH](https://appshunter.io/developer/6803589847) |

## What reviewers say

### Echo Step

[App page](https://appshunter.io/ios/app/echo-step-first-move/id6800201050)

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

**In-app purchases:** none


### Model Engine Builder

[App page](https://appshunter.io/ios/app/model-engine-builder/id6803801661)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| removeads | $1.99 | one-time |


## Frequently asked questions

### Is Echo Step free?

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

### Is Model Engine Builder free?

Model Engine Builder is free to download, with in-app purchases available.

### Do Echo Step or Model Engine Builder have ads?

Both Echo Step and Model Engine Builder show ads.

---

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