# Theta vs Libre Light Sensor

The clearest difference is ratings volume: Libre Light Sensor at 113 against Theta's 1. Theta's advantage is review sentiment (100% vs 82%) and device support (4 vs 1). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Theta holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Libre Light Sensor has 113 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 82% of Libre Light Sensor's.

Theta ships an update monthly, Libre Light Sensor every 5 weeks. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Theta | Libre Light Sensor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/theta-meter-light/id1077931723/reviews)** | [4.8 (113 ratings)](https://appshunter.io/ios/app/libre-light-sensor/id1644439968/reviews) |
| Number of ratings | 1 | **113** |
| Positive reviews | **100.0% of reviews** | 82.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | Free | Free |
| Size | 13 MB | 1 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Mikhail Fedorov](https://appshunter.io/developer/714735606) | [John Harrington](https://appshunter.io/developer/1603002572) |

## 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


### Libre Light Sensor

[App page](https://appshunter.io/ios/app/libre-light-sensor/id1644439968)

Measure ambient light levels in Lux using your iPhone's camera. Optimize sleep quality by understanding light exposure throughout the day and night.

**Highlights:** Measure light in Lux, Utilizes iPhone camera, Optimize sleep quality, Track light exposure

**In-app purchases:** none


## Frequently asked questions

### Is Theta free?

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

### Is Libre Light Sensor free?

Libre Light Sensor is free to download, with no in-app purchases.

### Which has better reviews, Theta or Libre Light Sensor?

Theta is rated higher. Theta averages 5.0 out of 5 from 1 ratings, while Libre Light Sensor averages 4.8 from 113 ratings.

### Do Theta or Libre Light Sensor have ads?

Neither Theta nor Libre Light Sensor shows ads.

### Which is updated more often, Theta or Libre Light Sensor?

Theta ships an update monthly, and Libre Light Sensor every 5 weeks. Most recently, Theta was updated on September 23, 2026 and Libre Light Sensor on September 22, 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.*