# OpoLua vs JSON Viewer(Pro)

The clearest difference is price: OpoLua at Free against JSON Viewer(Pro)'s $2.99. JSON Viewer(Pro)'s advantage is iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

OpoLua is free to download; JSON Viewer(Pro) costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | OpoLua | JSON Viewer(Pro) |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | — |
| Monetization | Free | — |
| Size | 9 MB | 64 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Jason Morley](https://appshunter.io/developer/1711473431) | [Hrishi Suthar](https://appshunter.io/developer/1660005858) |

## What reviewers say

### OpoLua

[App page](https://appshunter.io/ios/app/opolua/id1604029880)

This utility allows users to view and interact with files from Psion computers, including image files, scripts, and resources. It also supports listening to sound files and running OPL scripts and programs directly on compatible devices.

**Highlights:** View MBM image files, View OPL scripts, View AIF resources, Listen to sound files, Run OPL scripts and programs

**Features:** Game Controller support

**In-app purchases:** none


### JSON Viewer(Pro)

[App page](https://appshunter.io/ios/app/json-viewerpro/id6740746553)

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

**In-app purchases:** none


## Frequently asked questions

### Is OpoLua free?

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

### Is JSON Viewer(Pro) free?

JSON Viewer(Pro) costs $2.99, with no in-app purchases.

### Do OpoLua or JSON Viewer(Pro) have ads?

Neither OpoLua nor JSON Viewer(Pro) shows ads.

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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.*