# optrel vs Emko

The clearest difference is in-app purchases: optrel at none against Emko's 2. optrel also leads on iOS requirement (12.2 vs 15.1). Emko's advantage is update cadence (every 5 weeks vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. Emko sells 2 in-app purchases, starting at $1.99 per month. optrel asks for nothing beyond the download.

optrel ships an update every 6 months, Emko every 5 weeks. The most recent releases landed on June 11, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | optrel | Emko |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 weeks** |
| Size | 207 MB | 30 MB |
| Requires iOS | **12.2** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [optrel tec ag](https://appshunter.io/developer/1549530923) | [CODEUPP](https://appshunter.io/developer/1507385586) |

## What reviewers say

### optrel

[App page](https://appshunter.io/ios/app/optrel/id1549530921)

**Features:** macOS Compatibility

**In-app purchases:** none


### Emko

[App page](https://appshunter.io/ios/app/emko-isometric-pipefitter/id6471570117)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mesačné | $1.99 | per month |
| Ročné | $17.99 | per year |


## Frequently asked questions

### Is optrel free?

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

### Is Emko free?

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

### Do optrel or Emko have ads?

Neither optrel nor Emko shows ads.

### Which is updated more often, optrel or Emko?

optrel ships an update every 6 months, and Emko every 5 weeks. Most recently, optrel was updated on June 11, 2026 and Emko on September 5, 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.*