# VibraUnits vs Chemistry Toolbox

The clearest difference is in-app purchases: VibraUnits at none against Chemistry Toolbox's 2. VibraUnits also leads on iOS requirement (7.0 vs 17.6). Chemistry Toolbox's advantage is update cadence (daily vs every 10 months). On price, ads and device support there is nothing between them.

Both are free to download. Chemistry Toolbox sells 2 one-off in-app purchases. VibraUnits asks for nothing beyond the download.

VibraUnits ships an update every 10 months, Chemistry Toolbox daily. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | VibraUnits | Chemistry Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (9 ratings)](https://appshunter.io/ios/app/vibraunits/id445231670/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Daily** |
| Monetization | Free | — |
| Size | 8 MB | 12 MB |
| Requires iOS | **7.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Motionics LLC](https://appshunter.io/developer/424498959) | [Florent Breton](https://appshunter.io/developer/1184085186) |

## 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


### Chemistry Toolbox

[App page](https://appshunter.io/ios/app/chemistry-toolbox/id6764052683)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One month subscription | $0.99 | one-time |
| Full app | $4.99 | one-time |


## Frequently asked questions

### Is VibraUnits free?

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

### Is Chemistry Toolbox free?

Chemistry Toolbox is free to download, with in-app purchases available.

### Do VibraUnits or Chemistry Toolbox have ads?

Neither VibraUnits nor Chemistry Toolbox shows ads.

### Which is updated more often, VibraUnits or Chemistry Toolbox?

VibraUnits ships an update every 10 months, and Chemistry Toolbox daily. Most recently, VibraUnits was updated on October 29, 2026 and Chemistry Toolbox on October 28, 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.*