# Theta vs Vsensor

The clearest difference is rating: Theta at 5.0 against Vsensor's 3.0. Theta also leads on review sentiment (100% vs 60%) and device support (4 vs 2). Vsensor's advantage is ratings volume (8 vs 1). On price, update cadence, ads and in-app purchases 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 3.0. That said, the two scores are not equally well evidenced: Vsensor has 8 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 60% of Vsensor's.

Theta ships an update monthly, Vsensor every 3 weeks. The most recent releases landed on September 23, 2026 and August 18, 2026 respectively.

## The numbers

| Metric | Theta | Vsensor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/theta-meter-light/id1077931723/reviews)** | [3.0 (8 ratings)](https://appshunter.io/ios/app/vsensor/id1635688804/reviews) |
| Number of ratings | 1 | **8** |
| Positive reviews | **100.0% of reviews** | 60.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 13 MB | 70 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Mikhail Fedorov](https://appshunter.io/developer/714735606) | [健成 李](https://appshunter.io/developer/1055522601) |

## 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


### Vsensor

[App page](https://appshunter.io/ios/app/vsensor/id1635688804)

This utility app displays environmental data like PAR, CO2, and CO concentrations directly on your phone. It requires compatible external meters to function.

**Highlights:** Displays PAR data, Shows CO2 concentration, Reads CO concentration, Works with external meters, Professional tool

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Theta free?

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

### Is Vsensor free?

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

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

Theta is rated higher. Theta averages 5.0 out of 5 from 1 ratings, while Vsensor averages 3.0 from 8 ratings.

### Do Theta or Vsensor have ads?

Neither Theta nor Vsensor shows ads.

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

Theta ships an update monthly, and Vsensor every 3 weeks. Most recently, Theta was updated on September 23, 2026 and Vsensor on August 18, 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.*