# Theta vs Luminometer

The clearest difference is review sentiment: Theta at 100% against Luminometer's 0%. Theta also leads on rating (5.0 vs 3.5) and in-app purchases (none vs 2). Luminometer's advantage is ratings volume (16 vs 1). On price and update cadence there is nothing between them.

Both are free to download. Luminometer sells 2 in-app purchases, starting at $2.99 per 7 days. Theta asks for nothing beyond the download.

Theta holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: Luminometer has 16 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Theta's written reviews are positive against 0% of Luminometer's.

Theta ships an update monthly, Luminometer every 2 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Theta | Luminometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/theta-meter-light/id1077931723/reviews)** | [3.5 (16 ratings)](https://appshunter.io/ios/app/luminometer-lux-light-meter/id6446325225/reviews) |
| Number of ratings | 1 | **16** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 13 MB | 14 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Mikhail Fedorov](https://appshunter.io/developer/714735606) | [27GROUP](https://appshunter.io/developer/1589401961) |

## What reviewers say

### Theta

[App page](https://appshunter.io/ios/app/theta-meter-light/id1077931723)

This application connects to specialized devices to measure and display galvanic skin response. It utilizes Wi-Fi and Bluetooth 4.0BLE to collect data on skin conductance, providing insights into physiological responses.

**Highlights:** Galvanic skin response measurement, Wi-Fi connectivity, Bluetooth 4.0BLE connection, Skin conductance data display, Physiological response tracking

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Theta free?

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

### Is Luminometer free?

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

### Which has better reviews, Theta or Luminometer?

Theta is rated higher. Theta averages 5.0 out of 5 from 1 ratings, while Luminometer averages 3.5 from 16 ratings.

### Do Theta or Luminometer have ads?

Luminometer shows ads; Theta does not.

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

Theta ships an update monthly, and Luminometer every 2 months. Most recently, Theta was updated on October 29, 2026 and Luminometer on October 24, 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.*