# E vs Light Meter LM

The clearest difference is rating: E at 5.0 against Light Meter LM's 4.5. E also leads on in-app purchases (none vs 3) and iOS requirement (10.3 vs 15.0). Light Meter LM's advantage is ads (none vs shown) and ratings volume (2.6K vs 2). On price and device support there is nothing between them.

Both are free to download. Light Meter LM sells 3 in-app purchases, starting at $3.49 per month. E asks for nothing beyond the download.

E holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Light Meter LM has 2.6K ratings behind it against 2, so its average is the more settled of the two.

E ships an update every 4 months, Light Meter LM monthly. The most recent releases landed on October 7, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | E | Light Meter LM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/e-diagnostic/id1387730960/reviews)** | [4.5 (2.6K ratings)](https://appshunter.io/ios/app/light-meter-lm-3000/id1554264761/reviews) |
| Number of ratings | 2 | **2.6K** |
| Positive reviews | — | 40.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 42 MB | 22 MB |
| Requires iOS | **10.3** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [333 Corporate 1998, S.L.](https://appshunter.io/developer/601314449) | [Lightray Innovation GmbH](https://appshunter.io/developer/1031383431) |

## What reviewers say

### E

[App page](https://appshunter.io/ios/app/e-diagnostic/id1387730960)

This diagnostic tool helps identify potential swine diseases based on observed symptoms and animal age. It provides detailed descriptions and images of conditions, acting as an illustrative guide for users registered on pig333.com.

**Highlights:** Swine disease and condition descriptions, Images of major swine diseases, Symptom-based diagnosis, Age-specific disease lists, Detailed disease information, Multilingual support (English, Spanish)

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

**In-app purchases:** none


### Light Meter LM

[App page](https://appshunter.io/ios/app/light-meter-lm-3000/id1554264761)

Transform your smartphone into a professional light meter. Measure illuminance and color temperature with scientifically validated accuracy, trusted by professionals. Requires a simple diffuser for precise readings.

**Highlights:** Measure illuminance (lux/foot-candle), Measure color temperature (Kelvin), Industry-leading accuracy, Pre-calibrated for your device, Low light sensitivity, Save peak reading, Custom calibration option

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Continuous Charging | $3.49 | per month |
| Single Charge | $0.99 | one-time |
| Unlimited Battery | $19.99 | one-time |

**What reviewers like**

- 👍 Great app
- 👍 Accurate measurements
- 👍 Easy to use
- 👍 Helpful customer service
- 👍 Useful for science/research

**What reviewers complain about**

- 🐛 Requires diffuser for accurate readings
- 💰 Expensive for a light meter app
- 🔋 Battery/trial period issues
- 🔍 Inconsistent/inaccurate readings
- 🙄 Misleading/deceptive marketing

**Reported bugs**

- Diffuser not recognized even when used
- App locks up/crashes
- Constant diffuser pop-up interruptions

**Requested features**

- Ability to use rear camera
- More flexible diffuser options
- Improved accuracy without diffuser


## Frequently asked questions

### Is E free?

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

### Is Light Meter LM free?

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

### Which has better reviews, E or Light Meter LM?

E is rated higher. E averages 5.0 out of 5 from 2 ratings, while Light Meter LM averages 4.5 from 2.6K ratings.

### Do E or Light Meter LM have ads?

E shows ads; Light Meter LM does not.

### Which is updated more often, E or Light Meter LM?

E ships an update every 4 months, and Light Meter LM monthly. Most recently, E was updated on October 7, 2026 and Light Meter LM on October 29, 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.*