# P&ID vs Gas Compressor AR

The clearest difference is in-app purchases: Gas Compressor AR at none against P&ID's 3. Gas Compressor AR also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. P&ID sells 3 in-app purchases, starting at $9.99 per month. Gas Compressor AR asks for nothing beyond the download.

P&ID ships an update every 2 weeks, Gas Compressor AR every 3 weeks. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | P&ID | Gas Compressor AR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/p-and-id/id6738429006/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 294 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) | [infivr](https://appshunter.io/developer/1463011911) |

## What reviewers say

### P&ID

[App page](https://appshunter.io/ios/app/p-and-id/id6738429006)

Master the art of reading and interpreting Piping and Instrumentation Diagrams (P&IDs) with this engaging trivia quiz. Test your knowledge of P&ID symbols and their applications through interactive quizzes with detailed explanations and real-world examples. Learn at your own pace with multiple difficulty levels and offline mode.

**Highlights:** Interactive P&ID symbol quizzes, Symbol categorization, Detailed explanations and examples, Multiple difficulty levels, Offline learning mode

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Month | $9.99 | per month |
| 6 months | $19.99 | per 6 months |
| Year | $29.99 | per year |


### Gas Compressor AR

[App page](https://appshunter.io/ios/app/gas-compressor-ar/id6758047603)

**In-app purchases:** none


## Frequently asked questions

### Is P&ID free?

P&ID is free to download, with in-app purchases available.

### Is Gas Compressor AR free?

Gas Compressor AR is free to download, with no in-app purchases.

### Do P&ID or Gas Compressor AR have ads?

Neither P&ID nor Gas Compressor AR shows ads.

### Which is updated more often, P&ID or Gas Compressor AR?

P&ID ships an update every 2 weeks, and Gas Compressor AR every 3 weeks. Most recently, P&ID was updated on November 4, 2026 and Gas Compressor AR on October 31, 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.*