# OPJMS vs WRK | World Knowledge

The clearest difference is update cadence: OPJMS at every 2 months against WRK | World Knowledge's every 26 months. OPJMS also leads on iOS requirement (12.0 vs 14.0). 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.

OPJMS ships an update every 2 months, WRK | World Knowledge every 26 months. The most recent releases landed on May 19, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | OPJMS | WRK | World Knowledge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 26 months |
| Size | 66 MB | 478 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Shri Educare Limited](https://appshunter.io/developer/1801406691) | [Ilonka Rebergen](https://appshunter.io/developer/1703726435) |

## What reviewers say

### OPJMS

[App page](https://appshunter.io/ios/app/opjms/id6450032740)

**Features:** macOS Compatibility

**In-app purchases:** none


### WRK | World Knowledge

[App page](https://appshunter.io/ios/app/wrk-world-knowledge/id6462980820)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is OPJMS free?

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

### Is WRK | World Knowledge free?

WRK | World Knowledge is free to download, with no in-app purchases.

### Do OPJMS or WRK | World Knowledge have ads?

Neither OPJMS nor WRK | World Knowledge shows ads.

### Which is updated more often, OPJMS or WRK | World Knowledge?

OPJMS ships an update every 2 months, and WRK | World Knowledge every 26 months. Most recently, OPJMS was updated on May 19, 2026 and WRK | World Knowledge on September 20, 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.*