# VibraUnits vs Material Engineering

The clearest difference is in-app purchases: VibraUnits at none against Material Engineering's 6. VibraUnits also leads on ratings volume (9 vs 1) and iOS requirement (7.0 vs 17.0). Material Engineering's advantage is rating (5.0 vs 4.6) and update cadence (every 3 months vs every 10 months). On price, ads and device support there is nothing between them.

Both are free to download. Material Engineering sells 6 in-app purchases, starting at $9.99 per month. VibraUnits asks for nothing beyond the download.

Material Engineering holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: VibraUnits has 9 ratings behind it against 1, so its average is the more settled of the two.

VibraUnits ships an update every 10 months, Material Engineering every 3 months. The most recent releases landed on September 22, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | VibraUnits | Material Engineering |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (9 ratings)](https://appshunter.io/ios/app/vibraunits/id445231670/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/material-engineering/id6739977362/reviews)** |
| Number of ratings | **9** | 1 |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 8 MB | 17 MB |
| Requires iOS | **7.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Motionics LLC](https://appshunter.io/developer/424498959) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## 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


### Material Engineering

[App page](https://appshunter.io/ios/app/material-engineering/id6739977362)

Master material science concepts with an engaging quiz app. Explore diverse topics, receive instant feedback, and track your progress. Perfect for students, professionals, and enthusiasts seeking to deepen their understanding of materials.

**Highlights:** Comprehensive quizzes on various material types, Expert-designed challenging questions, Instant feedback with detailed explanations, Personalized progress tracking and analytics, Diverse quiz modes (practice, timed, topic-focused), Achievements and leaderboards

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


## Frequently asked questions

### Is VibraUnits free?

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

### Is Material Engineering free?

Material Engineering is free to download, with in-app purchases available.

### Which has better reviews, VibraUnits or Material Engineering?

Material Engineering is rated higher. VibraUnits averages 4.6 out of 5 from 9 ratings, while Material Engineering averages 5.0 from 1 ratings.

### Do VibraUnits or Material Engineering have ads?

Neither VibraUnits nor Material Engineering shows ads.

### Which is updated more often, VibraUnits or Material Engineering?

VibraUnits ships an update every 10 months, and Material Engineering every 3 months. Most recently, VibraUnits was updated on September 22, 2026 and Material Engineering on October 1, 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.*