# Instrumentation Directory vs PLC View

The clearest difference is update cadence: PLC View at every 5 weeks against Instrumentation Directory's every 9 months. PLC View also leads on iOS requirement (11.0 vs 16.0). 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.

Instrumentation Directory ships an update every 9 months, PLC View every 5 weeks. The most recent releases landed on September 14, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Instrumentation Directory | PLC View |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/instrumentation-directory/id883583428/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 5 weeks** |
| Monetization | Free | — |
| Size | 29 MB | 49 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Datateam Business Media Ltd](https://appshunter.io/developer/531755760) | [Advantive](https://appshunter.io/developer/1698161668) |

## What reviewers say

### Instrumentation Directory

[App page](https://appshunter.io/ios/app/instrumentation-directory/id883583428)

This specialized annual directory connects instrumentation professionals with purchasers and specifiers of control, sensors, and test equipment. It serves as a comprehensive reference guide for the industry, evolving with market trends since its 2002 launch.

**Highlights:** Specialized annual directory, Connects purchasers and specifiers, Covers control, instrumentation, sensors, Includes test & measurement equipment, Industry reference guide

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

**In-app purchases:** none


### PLC View

[App page](https://appshunter.io/ios/app/plc-view/id6450829559)

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

**In-app purchases:** none


## Frequently asked questions

### Is Instrumentation Directory free?

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

### Is PLC View free?

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

### Do Instrumentation Directory or PLC View have ads?

Neither Instrumentation Directory nor PLC View shows ads.

### Which is updated more often, Instrumentation Directory or PLC View?

Instrumentation Directory ships an update every 9 months, and PLC View every 5 weeks. Most recently, Instrumentation Directory was updated on September 14, 2026 and PLC View on September 7, 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.*