# Mechanical Formula vs eigenCalc

The clearest difference is in-app purchases: eigenCalc at none against Mechanical Formula's 1. eigenCalc also leads on update cadence (monthly vs every 4 months). Mechanical Formula's advantage is iOS requirement (13.0 vs 15.5). 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. eigenCalc asks for nothing beyond the download.

Mechanical Formula ships an update every 4 months, eigenCalc monthly. The most recent releases landed on September 19, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Mechanical Formula | eigenCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (34 ratings)](https://appshunter.io/ios/app/mechanical-formula/id1668948373/reviews)** | — |
| Number of ratings | **34** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 42 MB | 2 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) | [Luis Acevedo-Arreguin](https://appshunter.io/developer/1642773653) |

## 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 |


### eigenCalc

[App page](https://appshunter.io/ios/app/eigencalc/id6503222785)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mechanical Formula free?

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

### Is eigenCalc free?

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

### Do Mechanical Formula or eigenCalc have ads?

Neither Mechanical Formula nor eigenCalc shows ads.

### Which is updated more often, Mechanical Formula or eigenCalc?

Mechanical Formula ships an update every 4 months, and eigenCalc monthly. Most recently, Mechanical Formula was updated on September 19, 2026 and eigenCalc on September 17, 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.*