# Eng Dynamics vs Mechanical Formula

The clearest difference is in-app purchases: Eng Dynamics at none against Mechanical Formula's 1. Eng Dynamics also leads on rating (5.0 vs 4.7) and iOS requirement (9.0 vs 13.0). Mechanical Formula's advantage is ratings volume (34 vs 1). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. Mechanical Formula sells 1 one-off in-app purchase. Eng Dynamics asks for nothing beyond the download.

Eng Dynamics holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Mechanical Formula has 34 ratings behind it against 1, so its average is the more settled of the two.

Eng Dynamics ships an update every 8 months, Mechanical Formula every 4 months. The most recent releases landed on June 10, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Eng Dynamics | Mechanical Formula |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/eng-dynamics/id1510250282/reviews)** | [4.7 (34 ratings)](https://appshunter.io/ios/app/mechanical-formula/id1668948373/reviews) |
| Number of ratings | 1 | **34** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 months** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 21 MB | 42 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kurt Gramoll](https://appshunter.io/developer/782218116) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## What reviewers say

### Eng Dynamics

[App page](https://appshunter.io/ios/app/eng-dynamics/id1510250282)

This app offers practice problems and solutions for engineering Dynamics courses, mirroring textbook structures. It links to a free online eBook for theoretical support. A free version provides limited problems, while a paid version unlocks a comprehensive library.

**Highlights:** Real homework and test problems, Organized by textbook sections/chapters, Complete solutions with graphics, Links to online eBook theory, Extensive problem library (Pro version), Problems used in real engineering classes

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Eng Dynamics free?

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

### Is Mechanical Formula free?

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

### Which has better reviews, Eng Dynamics or Mechanical Formula?

Eng Dynamics is rated higher. Eng Dynamics averages 5.0 out of 5 from 1 ratings, while Mechanical Formula averages 4.7 from 34 ratings.

### Do Eng Dynamics or Mechanical Formula have ads?

Neither Eng Dynamics nor Mechanical Formula shows ads.

### Which is updated more often, Eng Dynamics or Mechanical Formula?

Eng Dynamics ships an update every 8 months, and Mechanical Formula every 4 months. Most recently, Eng Dynamics was updated on June 10, 2026 and Mechanical Formula on September 19, 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.*