# Libre Light Sensor vs Luminosys

The clearest difference is ads: Libre Light Sensor at none against Luminosys's shown. Libre Light Sensor also leads on update cadence (every 5 weeks vs every 19 months) and rating (4.8 vs 4.4). On price, review sentiment, in-app purchases and device support there is nothing between them.

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

Libre Light Sensor holds the better App Store score, 4.8 against 4.4. That said, the two scores are not equally well evidenced: Libre Light Sensor has 113 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 82% of Libre Light Sensor's written reviews are positive against 75% of Luminosys's.

Libre Light Sensor ships an update every 5 weeks, Luminosys every 19 months. The most recent releases landed on September 28, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Libre Light Sensor | Luminosys |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (113 ratings)](https://appshunter.io/ios/app/libre-light-sensor/id1644439968/reviews)** | [4.4 (7 ratings)](https://appshunter.io/ios/app/luminosys-light-meter/id6476405389/reviews) |
| Number of ratings | **113** | 7 |
| Positive reviews | **82.4% of reviews** | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 5 weeks** | Every 19 months |
| Monetization | **Free** | Ad-supported |
| Size | 1 MB | 3 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [John Harrington](https://appshunter.io/developer/1603002572) | [Melissa Zwick](https://appshunter.io/developer/1616726350) |

## What reviewers say

### Libre Light Sensor

[App page](https://appshunter.io/ios/app/libre-light-sensor/id1644439968)

Measure ambient light levels in Lux using your iPhone's camera. Optimize sleep quality by understanding light exposure throughout the day and night.

**Highlights:** Measure light in Lux, Utilizes iPhone camera, Optimize sleep quality, Track light exposure

**In-app purchases:** none


### Luminosys

[App page](https://appshunter.io/ios/app/luminosys-light-meter/id6476405389)

Accurately measure ambient light levels in Lux or Foot Candles using your phone's camera. This tool is ideal for photography, comparing light sources, or indoor gardening. It's designed for ease of use and provides precise readings.

**Highlights:** Measures light in Lux, Measures light in Foot Candles (FC), Uses phone camera for accuracy, Easy to use interface, Suitable for photography, Useful for indoor gardening

**In-app purchases:** none


## Frequently asked questions

### Is Libre Light Sensor free?

Libre Light Sensor is free to download, with no in-app purchases.

### Is Luminosys free?

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

### Which has better reviews, Libre Light Sensor or Luminosys?

Libre Light Sensor is rated higher. Libre Light Sensor averages 4.8 out of 5 from 113 ratings, while Luminosys averages 4.4 from 7 ratings.

### Do Libre Light Sensor or Luminosys have ads?

Luminosys shows ads; Libre Light Sensor does not.

### Which is updated more often, Libre Light Sensor or Luminosys?

Libre Light Sensor ships an update every 5 weeks, and Luminosys every 19 months. Most recently, Libre Light Sensor was updated on September 28, 2026 and Luminosys on September 20, 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.*