# Light Teller vs Luminosys

The clearest difference is rating: Light Teller at 5.0 against Luminosys's 4.4. Light Teller also leads on ads (none vs shown) and update cadence (every 5 months vs every 19 months). Luminosys's advantage is in-app purchases (none vs 2) and ratings volume (7 vs 1). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Light Teller sells 2 one-off in-app purchases. Luminosys asks for nothing beyond the download.

Light Teller holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Luminosys has 7 ratings behind it against 1, so its average is the more settled of the two.

Light Teller ships an update every 5 months, Luminosys every 19 months. Both last shipped on September 20, 2026.

## The numbers

| Metric | Light Teller | Luminosys |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/light-teller/id6450953060/reviews)** | [4.4 (7 ratings)](https://appshunter.io/ios/app/luminosys-light-meter/id6476405389/reviews) |
| Number of ratings | 1 | **7** |
| Positive reviews | — | 75.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 5 months** | Every 19 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 1 MB | 3 MB |
| Requires iOS | 16.1 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [佳佳 陶](https://appshunter.io/developer/1682189695) | [Melissa Zwick](https://appshunter.io/developer/1616726350) |

## What reviewers say

### Light Teller

[App page](https://appshunter.io/ios/app/light-teller/id6450953060)

This app uses your smartphone camera to measure ambient light levels, helping parents ensure their children's study spaces have adequate lighting to protect their vision and reduce myopia risk. It offers clear instructions and educational content on light's impact on eye health.

**Highlights:** Brightness testing with smartphone camera, Light health guidance for parents, Detailed user instructions, Accurate and reliable measurements, Educational articles on visual health

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 Months Access | $1.99 | one-time |
| 1 Year Access | $4.99 | 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 Light Teller free?

Light Teller 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, Light Teller or Luminosys?

Light Teller is rated higher. Light Teller averages 5.0 out of 5 from 1 ratings, while Luminosys averages 4.4 from 7 ratings.

### Do Light Teller or Luminosys have ads?

Luminosys shows ads; Light Teller does not.

### Which is updated more often, Light Teller or Luminosys?

Light Teller ships an update every 5 months, and Luminosys every 19 months. Most recently, Light Teller was updated on September 20, 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.*