# Model Engine Builder vs Northdown

The clearest difference is update cadence: Northdown at every 3 days against Model Engine Builder's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Model Engine Builder sells 1 one-off in-app purchase and Northdown sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Model Engine Builder ships an update every 2 weeks, Northdown every 3 days. The most recent releases landed on October 4, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Model Engine Builder | Northdown |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Size | 20 MB | 56 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MIN GYu OH](https://appshunter.io/developer/6803589847) | [Revelar Solutions Private Limited](https://appshunter.io/developer/6796285613) |

## What reviewers say

### 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 |


### Northdown

[App page](https://appshunter.io/ios/app/northdown-3d-gravity-puzzle/id6809133373)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 500 coins | $0.99 | one-time |
| Remove ads | $2.99 | one-time |
| 2,000 coins | $2.99 | one-time |
| Everything pack | $4.99 | one-time |
| 6,000 coins | $6.99 | one-time |


## Frequently asked questions

### Is Model Engine Builder free?

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

### Is Northdown free?

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

### Do Model Engine Builder or Northdown have ads?

Both Model Engine Builder and Northdown show ads.

### Which is updated more often, Model Engine Builder or Northdown?

Model Engine Builder ships an update every 2 weeks, and Northdown every 3 days. Most recently, Model Engine Builder was updated on October 4, 2026 and Northdown on October 13, 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.*