# VibraUnits vs Lumen

The clearest difference is update cadence: Lumen at monthly against VibraUnits's every 10 months. VibraUnits's advantage is device support (3 vs 1) and iOS requirement (7.0 vs 18.6). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

VibraUnits ships an update every 10 months, Lumen monthly. The most recent releases landed on November 1, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | VibraUnits | Lumen |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Monthly** |
| Monetization | Free | — |
| Size | 8 MB | 1 MB |
| Requires iOS | **7.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [Motionics LLC](https://appshunter.io/developer/424498959) | [Francesco Chiusolo](https://appshunter.io/developer/1511604223) |

## 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


### Lumen

[App page](https://appshunter.io/ios/app/lumen-telescope-guide/id6759408180)

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

**In-app purchases:** none


## Frequently asked questions

### Is VibraUnits free?

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

### Is Lumen free?

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

### Do VibraUnits or Lumen have ads?

Neither VibraUnits nor Lumen shows ads.

### Which is updated more often, VibraUnits or Lumen?

VibraUnits ships an update every 10 months, and Lumen monthly. Most recently, VibraUnits was updated on November 1, 2026 and Lumen on October 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*