# Vibra Calc vs Mechanical Formula

The clearest difference is review sentiment: Vibra Calc at 50% against Mechanical Formula's 0%. Vibra Calc also leads on in-app purchases (none vs 1) and iOS requirement (8.0 vs 13.0). Mechanical Formula's advantage is rating (4.7 vs 4.0) and update cadence (every 4 months vs every 39 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. Vibra Calc asks for nothing beyond the download.

Mechanical Formula holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Mechanical Formula has 34 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 50% of Vibra Calc's written reviews are positive against 0% of Mechanical Formula's, so the app with the better star average is not the one people write more warmly about.

Vibra Calc ships an update every 39 months, Mechanical Formula every 4 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Vibra Calc | Mechanical Formula |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (2 ratings)](https://appshunter.io/ios/app/vibra-calc/id458723288/reviews) | **[4.7 (34 ratings)](https://appshunter.io/ios/app/mechanical-formula/id1668948373/reviews)** |
| Number of ratings | 2 | **34** |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 4 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 22 MB | 42 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [Motionics LLC](https://appshunter.io/developer/424498959) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## What reviewers say

### Vibra Calc

[App page](https://appshunter.io/ios/app/vibra-calc/id458723288)

This app calculates vibration frequencies for various rotating machinery components and includes an interactive vibration severity test tool. It also offers a calculator for converting vibration units and a glossary of terms.

**Highlights:** Induction motor frequency calculation, Detailed gear frequencies, Rolling element bearing frequencies, Pump and fan vane pass frequencies, Journal bearing frequencies, Interactive vibration severity test, Vibration unit conversion

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

**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 Vibra Calc free?

Vibra Calc 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, Vibra Calc or Mechanical Formula?

Mechanical Formula is rated higher. Vibra Calc averages 4.0 out of 5 from 2 ratings, while Mechanical Formula averages 4.7 from 34 ratings.

### Do Vibra Calc or Mechanical Formula have ads?

Neither Vibra Calc nor Mechanical Formula shows ads.

### Which is updated more often, Vibra Calc or Mechanical Formula?

Vibra Calc ships an update every 39 months, and Mechanical Formula every 4 months. Most recently, Vibra Calc was updated on October 29, 2026 and Mechanical Formula on October 30, 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.*