# Light Teller vs 鯨好印

The clearest difference is in-app purchases: 鯨好印 at none against Light Teller's 2. 鯨好印 also leads on iOS requirement (13.0 vs 16.1). On price, update cadence, ads and device support there is nothing between them.

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

Light Teller ships an update every 5 months, 鯨好印 every 2 months. The most recent releases landed on September 20, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Light Teller | 鯨好印 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/light-teller/id6450953060/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 26 MB |
| Requires iOS | 16.1 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [佳佳 陶](https://appshunter.io/developer/1682189695) | [鯨躍科技有限公司](https://appshunter.io/developer/1574159366) |

## 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 |


### 鯨好印

[App page](https://appshunter.io/ios/app/id6755984492)

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

**In-app purchases:** none


## Frequently asked questions

### Is Light Teller free?

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

### Is 鯨好印 free?

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

### Do Light Teller or 鯨好印 have ads?

Neither Light Teller nor 鯨好印 shows ads.

### Which is updated more often, Light Teller or 鯨好印?

Light Teller ships an update every 5 months, and 鯨好印 every 2 months. Most recently, Light Teller was updated on September 20, 2026 and 鯨好印 on October 16, 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.*