# VibraUnits vs Mechanical Formula

VibraUnits and Mechanical Formula both sit at 4.6 stars, but that hides the real split: 88% of VibraUnits's written reviews are positive against 0% of Mechanical Formula's. VibraUnits also leads on in-app purchases (none vs 1) and iOS requirement (7.0 vs 13.0). Mechanical Formula's advantage is update cadence (every 4 months vs every 10 months) and ratings volume (34 vs 9). On price, rating, ads and device support there is nothing between them.

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

Mechanical Formula holds the better App Store score, 4.7 against 4.6. Both are backed by a comparable volume of ratings — 9 and 34 respectively. Written reviews complicate that: 88% of VibraUnits'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.

VibraUnits ships an update every 10 months, Mechanical Formula every 4 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | VibraUnits | Mechanical Formula |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (9 ratings)](https://appshunter.io/ios/app/vibraunits/id445231670/reviews) | **[4.7 (34 ratings)](https://appshunter.io/ios/app/mechanical-formula/id1668948373/reviews)** |
| Number of ratings | 9 | **34** |
| Positive reviews | **87.5% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 4 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 8 MB | 42 MB |
| Requires iOS | **7.0** | 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

### VibraUnits

[App page](https://appshunter.io/ios/app/vibraunits/id445231670)

This application facilitates the conversion of mechanical vibration analysis units. It supports conversions between displacement, velocity, and acceleration, along with frequency and various amplitude scales.

**Highlights:** Velocity, acceleration, displacement conversion, Frequency conversion (Hz to CPM), Displacement conversion (mils to microns), Velocity conversion (inch/s to mm/s), Acceleration conversion (G's to m/s^2)

**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 VibraUnits free?

VibraUnits 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, VibraUnits or Mechanical Formula?

Mechanical Formula is rated higher. VibraUnits averages 4.6 out of 5 from 9 ratings, while Mechanical Formula averages 4.7 from 34 ratings.

### Do VibraUnits or Mechanical Formula have ads?

Neither VibraUnits nor Mechanical Formula shows ads.

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

VibraUnits ships an update every 10 months, and Mechanical Formula every 4 months. Most recently, VibraUnits was updated on October 23, 2026 and Mechanical Formula on October 24, 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.*