# QiMenChart vs LUX Meter

The clearest difference is price: LUX Meter at Free against QiMenChart's $6.99. LUX Meter also leads on update cadence (every 3 days vs every 6 months). QiMenChart's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 17.0). On ads and in-app purchases there is nothing between them.

LUX Meter is free to download; QiMenChart costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

QiMenChart ships an update every 6 months, LUX Meter every 3 days. The most recent releases landed on October 8, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | QiMenChart | LUX Meter |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/lux-meter-light-meter/id6783321327/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 days** |
| Monetization | Paid | **Free** |
| Size | 6 MB | 3 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [LAY KHIM TAN](https://appshunter.io/developer/738497892) | [Yannick Binay](https://appshunter.io/developer/6783321329) |

## What reviewers say

### QiMenChart

[App page](https://appshunter.io/ios/app/qimenchart/id1028901400)

This app generates historical charts for years, months, days, and hours using traditional Chinese calendrical methods. It allows users to orient the chart with a compass based on their position. The application focuses solely on chart plotting without providing any analysis or user settings.

**Highlights:** Plot Year, Month, Day, Hour Charts, Chai Bu and Zhi Run Methods, Year Range 1800-9999, Compass Orientation, Chart Plotting Only

**In-app purchases:** none


### LUX Meter

[App page](https://appshunter.io/ios/app/lux-meter-light-meter/id6783321327)

This app measures ambient light levels in lux or foot-candles using your iPhone camera. It provides instant feedback on whether a space is too dim, comfortable, or bright enough for various tasks and offers calibration options.

**Highlights:** Lux and foot-candle readings, Lighting target presets, Live brightness scale, Hold mode for measurements, Session min, average, and max, Calibration against trusted value, Private on-device metering

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

**In-app purchases:** none


## Frequently asked questions

### Is QiMenChart free?

QiMenChart costs $6.99, with no in-app purchases.

### Is LUX Meter free?

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

### Do QiMenChart or LUX Meter have ads?

Neither QiMenChart nor LUX Meter shows ads.

### Which is updated more often, QiMenChart or LUX Meter?

QiMenChart ships an update every 6 months, and LUX Meter every 3 days. Most recently, QiMenChart was updated on October 8, 2026 and LUX Meter on October 10, 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.*