# Luminometer vs ECO

The clearest difference is in-app purchases: ECO at none against Luminometer's 2. ECO also leads on ads (none vs shown) and iOS requirement (13.0 vs 16.6). Luminometer's advantage is update cadence (every 2 months vs every 10 months). On price 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. ECO asks for nothing beyond the download.

Luminometer ships an update every 2 months, ECO every 10 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Luminometer | ECO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (16 ratings)](https://appshunter.io/ios/app/luminometer-lux-light-meter/id6446325225/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 10 months |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 41 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [27GROUP](https://appshunter.io/developer/1589401961) | [CHIH BIN CHEN](https://appshunter.io/developer/1828080151) |

## 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 |


### ECO

[App page](https://appshunter.io/ios/app/eco-link-pro/id6749229977)

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

**In-app purchases:** none


## Frequently asked questions

### Is Luminometer free?

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

### Is ECO free?

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

### Do Luminometer or ECO have ads?

Luminometer shows ads; ECO does not.

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

Luminometer ships an update every 2 months, and ECO every 10 months. Most recently, Luminometer was updated on October 24, 2026 and ECO on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*