# InstaPay Author vs ECK OPI

The clearest difference is iOS requirement: InstaPay Author at 11.0 against ECK OPI's 14.5. On price, ads, in-app purchases and device support there is nothing between them.

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

## The numbers

| Metric | InstaPay Author | ECK OPI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Size | 138 MB | 32 MB |
| Requires iOS | **11.0** | 14.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Instapay Inc](https://appshunter.io/developer/1455816462) | [ECK EDUCATION Inc.,](https://appshunter.io/developer/1467547973) |

## What reviewers say

### InstaPay Author

[App page](https://appshunter.io/ios/app/instapay-author/id6462687195)

**Features:** macOS Compatibility

**In-app purchases:** none


### ECK OPI

[App page](https://appshunter.io/ios/app/eck-opi/id6714463129)

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

**In-app purchases:** none


## Frequently asked questions

### Is InstaPay Author free?

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

### Is ECK OPI free?

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

### Do InstaPay Author or ECK OPI have ads?

Neither InstaPay Author nor ECK OPI shows ads.

---

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