# uSpectrum PAR vs Luxometer

The clearest difference is rating: Luxometer at 4.0 against uSpectrum PAR's 1.0. Luxometer also leads on update cadence (daily vs every 8 months) and ratings volume (8 vs 2). uSpectrum PAR's advantage is iOS requirement (9.0 vs 13.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Luxometer holds the better App Store score, 4.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 8 respectively.

uSpectrum PAR ships an update every 8 months, Luxometer daily. The most recent releases landed on September 16, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | uSpectrum PAR | Luxometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/uspectrum-par/id1466017397/reviews) | **[4.0 (8 ratings)](https://appshunter.io/ios/app/luxometer/id1528110029/reviews)** |
| Number of ratings | 2 | **8** |
| Positive reviews | — | 60.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Daily** |
| Monetization | Free | Free |
| Size | 25 MB | 0 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [United Power Research Technology Corporation](https://appshunter.io/developer/1501316337) | [Arias Software LLC](https://appshunter.io/developer/1458265015) |

## What reviewers say

### uSpectrum PAR

[App page](https://appshunter.io/ios/app/uspectrum-par/id1466017397)

This application connects wirelessly to a handheld spectral PAR meter, allowing remote analysis and configuration of light sources. It displays detailed spectral data, light source information, and absorption metrics, with options to save and share measurements.

**Highlights:** Wireless Bluetooth connection, Remote light source analysis, Save captured data, Display spectrum and CIE diagrams, View light source metrics (LUX, CCT, CRI), Share measured data via email

**Features:** macOS Compatibility

**In-app purchases:** none


### Luxometer

[App page](https://appshunter.io/ios/app/luxometer/id1528110029)

Measure ambient light intensity in Lumens and color temperature in Kelvin using your phone's built-in sensors. Point your device at a light source and see real-time readings, enhanced with augmented reality visualizations.

**Highlights:** Ambient light intensity measurement (Lumens), Ambient color temperature measurement (Kelvin), Real-time data readouts, Augmented reality visualizations, Uses device's built-in hardware

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is uSpectrum PAR free?

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

### Is Luxometer free?

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

### Which has better reviews, uSpectrum PAR or Luxometer?

Luxometer is rated higher. uSpectrum PAR averages 1.0 out of 5 from 2 ratings, while Luxometer averages 4.0 from 8 ratings.

### Do uSpectrum PAR or Luxometer have ads?

Neither uSpectrum PAR nor Luxometer shows ads.

### Which is updated more often, uSpectrum PAR or Luxometer?

uSpectrum PAR ships an update every 8 months, and Luxometer daily. Most recently, uSpectrum PAR was updated on September 16, 2026 and Luxometer on October 3, 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.*