# QEC Calculator vs Illuminance Meter

The clearest difference is in-app purchases: QEC Calculator at none against Illuminance Meter's 3. QEC Calculator also leads on update cadence (daily vs every 3 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Illuminance Meter sells 3 in-app purchases, starting at $3.99 per 7 days. QEC Calculator asks for nothing beyond the download.

QEC Calculator ships an update daily, Illuminance Meter every 3 months. The most recent releases landed on October 25, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | QEC Calculator | Illuminance Meter |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 months |
| Monetization | — | Free with in-app purchases |
| Size | 31 MB | 13 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Occupational Health Clinics for Ontario Workers](https://appshunter.io/developer/930198232) | [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814) |

## What reviewers say

### QEC Calculator

[App page](https://appshunter.io/ios/app/qec-calculator/id6743707589)

**Features:** macOS Compatibility

**In-app purchases:** none


### Illuminance Meter

[App page](https://appshunter.io/ios/app/illuminance-meter-lux-ppfd/id6759972986)

Transform your iPhone into a professional light meter to measure illuminance in lux or foot-candles. Ideal for photographers, plant enthusiasts, and workplace safety, it provides instant, accurate light readings with various specialized modes and data export options.

**Highlights:** Real-time lux measurement with live gauge, Photography mode for exposure value (EV) calculation, Plant light mode with recommendations, Workplace standards verification, Measurement history with export options, Spectrum analysis for color temperature and CRI, Multiple illuminance unit switching

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly Plan | $3.99 | per 7 days |
| Premium Yearly | $19.99 | per year |
| Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is QEC Calculator free?

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

### Is Illuminance Meter free?

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

### Do QEC Calculator or Illuminance Meter have ads?

Neither QEC Calculator nor Illuminance Meter shows ads.

### Which is updated more often, QEC Calculator or Illuminance Meter?

QEC Calculator ships an update daily, and Illuminance Meter every 3 months. Most recently, QEC Calculator was updated on October 25, 2026 and Illuminance Meter on November 7, 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.*