# Eng Fluids vs Mechanical Formula

The clearest difference is in-app purchases: Eng Fluids at none against Mechanical Formula's 1. Eng Fluids also leads on iOS requirement (9.0 vs 13.0). Mechanical Formula's advantage is update cadence (every 4 months vs every 13 months). On price, ads and device support there is nothing between them.

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

Eng Fluids ships an update every 13 months, Mechanical Formula every 4 months. The most recent releases landed on September 21, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Eng Fluids | Mechanical Formula |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (34 ratings)](https://appshunter.io/ios/app/mechanical-formula/id1668948373/reviews)** |
| Number of ratings | — | **34** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 4 months** |
| Monetization | — | 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 Fluids

[App page](https://appshunter.io/ios/app/eng-fluids/id1540624295)

**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 Fluids free?

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

### Is Mechanical Formula free?

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

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

Neither Eng Fluids nor Mechanical Formula shows ads.

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

Eng Fluids ships an update every 13 months, and Mechanical Formula every 4 months. Most recently, Eng Fluids was updated on September 21, 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.*