# Luminometer vs Luminosys

The clearest difference is review sentiment: Luminosys at 75% against Luminometer's 0%. Luminosys also leads on rating (4.3 vs 3.5) and in-app purchases (none vs 2). Luminometer's advantage is update cadence (every 2 months vs every 19 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Luminometer sells 2 in-app purchases, starting at $2.99 per 7 days. Luminosys asks for nothing beyond the download.

Luminosys holds the better App Store score, 4.3 against 3.5. Both are backed by a comparable volume of ratings — 16 and 10 respectively. Written reviews point the same way: 0% of Luminometer's written reviews are positive against 75% of Luminosys's.

Luminometer ships an update every 2 months, Luminosys every 19 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Luminometer | Luminosys |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (16 ratings)](https://appshunter.io/ios/app/luminometer-lux-light-meter/id6446325225/reviews) | **[4.3 (10 ratings)](https://appshunter.io/ios/app/luminosys-light-meter/id6476405389/reviews)** |
| Number of ratings | **16** | 10 |
| Positive reviews | 0.0% of reviews | **75.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 2 months** | Every 19 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 14 MB | 3 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [27GROUP](https://appshunter.io/developer/1589401961) | [Melissa Zwick](https://appshunter.io/developer/1616726350) |

## What reviewers say

### Luminometer

[App page](https://appshunter.io/ios/app/luminometer-lux-light-meter/id6446325225)

Transform your device into a professional light meter to measure luminosity in lux and foot-candles. Achieve optimal illumination for any space, from greenhouses to workspaces, ensuring comfort and preventing glare. Calibrated with reference equipment for precise and reliable readings.

**Highlights:** Measures lux and foot-candle units, Internal Exposure Compensation for accuracy, Camera view for measured area, Calibrated with reference equipment, Versatile for various lighting conditions, Helps set optimal illumination levels

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Lifetime | $9.99 | one-time |


### 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 Luminometer free?

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

### Is Luminosys free?

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

### Which has better reviews, Luminometer or Luminosys?

Luminosys is rated higher. Luminometer averages 3.5 out of 5 from 16 ratings, while Luminosys averages 4.3 from 10 ratings.

### Do Luminometer or Luminosys have ads?

Both Luminometer and Luminosys show ads.

### Which is updated more often, Luminometer or Luminosys?

Luminometer ships an update every 2 months, and Luminosys every 19 months. Most recently, Luminometer was updated on October 24, 2026 and Luminosys on October 24, 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.*