# Mechanical Formula vs P&ID

The clearest difference is update cadence: P&ID at every 2 weeks against Mechanical Formula's every 4 months. Mechanical Formula's advantage is rating (4.7 vs 4.3) and ratings volume (34 vs 6). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Mechanical Formula sells 1 one-off in-app purchase and P&ID sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Mechanical Formula holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: Mechanical Formula has 34 ratings behind it against 6, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.

Mechanical Formula ships an update every 4 months, P&ID every 2 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Mechanical Formula | P&ID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (34 ratings)](https://appshunter.io/ios/app/mechanical-formula/id1668948373/reviews)** | [4.3 (6 ratings)](https://appshunter.io/ios/app/p-and-id/id6738429006/reviews) |
| Number of ratings | **34** | 6 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 6 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## What reviewers say

### Mechanical Formula

[App page](https://appshunter.io/ios/app/mechanical-formula/id1668948373)

This app provides over 200 essential mechanical engineering formulas and calculations in a user-friendly tool. It's designed to simplify complex concepts and speed up problem-solving for students, professionals, and educators.

**Highlights:** 200+ mechanical engineering formulas, Instant calculations, Intuitive interface, Real-world application explanations, Exam preparation aid, Lifetime Premium option

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $9.99 | one-time |


### 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 |


## Frequently asked questions

### Is Mechanical Formula free?

Mechanical Formula is free to download, with in-app purchases available.

### Is P&ID free?

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

### Which has better reviews, Mechanical Formula or P&ID?

Mechanical Formula is rated higher. Mechanical Formula averages 4.7 out of 5 from 34 ratings, while P&ID averages 4.3 from 6 ratings.

### Do Mechanical Formula or P&ID have ads?

Neither Mechanical Formula nor P&ID shows ads.

### Which is updated more often, Mechanical Formula or P&ID?

Mechanical Formula ships an update every 4 months, and P&ID every 2 weeks. Most recently, Mechanical Formula was updated on November 3, 2026 and P&ID on November 4, 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.*