# OPTICHECK Level Mobile vs PLC Ninja

The clearest difference is in-app purchases: OPTICHECK Level Mobile at none against PLC Ninja's 6. OPTICHECK Level Mobile also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.6). PLC Ninja's advantage is update cadence (every 3 weeks vs every 3 months). On price and ads there is nothing between them.

Both are free to download. PLC Ninja sells 6 in-app purchases, starting at $3.99 per month. OPTICHECK Level Mobile asks for nothing beyond the download.

OPTICHECK Level Mobile ships an update every 3 months, PLC Ninja every 3 weeks. The most recent releases landed on October 4, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | OPTICHECK Level Mobile | PLC Ninja |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/plc-ninja/id6805188950/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 242 MB | 10 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [KROHNE Messtechnik GmbH](https://appshunter.io/developer/1445655816) | [SHAOHUA YI](https://appshunter.io/developer/6805189132) |

## What reviewers say

### OPTICHECK Level Mobile

[App page](https://appshunter.io/ios/app/opticheck-level-mobile/id1596750666)

**Features:** macOS Compatibility

**In-app purchases:** none


### PLC Ninja

[App page](https://appshunter.io/ios/app/plc-ninja/id6805188950)

Access live PLC data directly from your mobile device. Connect via Ethernet, Wi-Fi, or serial adapter to monitor inputs, outputs, timers, counters, and analog values in real-time while in the field.

**Highlights:** Real-time PLC data monitoring, Ethernet, Wi-Fi, and serial connection support, View inputs and outputs, Monitor timers and counters, Access analog values

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard | $3.99 | per month |
| Professional | $8.99 | per month |
| Ultimate | $14.99 | per month |
| Standard | $39.99 | per year |
| Professional | $89.99 | per year |
| Ultimate | $149.99 | per year |


## Frequently asked questions

### Is OPTICHECK Level Mobile free?

OPTICHECK Level Mobile is free to download, with no in-app purchases.

### Is PLC Ninja free?

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

### Do OPTICHECK Level Mobile or PLC Ninja have ads?

Neither OPTICHECK Level Mobile nor PLC Ninja shows ads.

### Which is updated more often, OPTICHECK Level Mobile or PLC Ninja?

OPTICHECK Level Mobile ships an update every 3 months, and PLC Ninja every 3 weeks. Most recently, OPTICHECK Level Mobile was updated on October 4, 2026 and PLC Ninja on October 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.*