Theta vs Vsensor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Theta
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.
- Galvanic skin response measurement
- Wi-Fi connectivity
- Bluetooth 4.0BLE connection
- Skin conductance data display
- Physiological response tracking
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Application displays data from Theta-Meter devices (Wi-Fi and Bluetooth 4.0BLE connection) which measures human body galvanic skin response. Skin conductance, also known as galvanic skin response (GSR), electrodermal response (EDR), psychogalvanic reflex (PGR), skin conductance response (SCR) or skin conductance level (SCL), is a method of measuring the electrical conductance of the skin.
Vsensor
This utility app displays environmental data like PAR, CO2, and CO concentrations directly on your phone. It requires compatible external meters to function.
- Displays PAR data
- Shows CO2 concentration
- Reads CO concentration
- Works with external meters
- Professional tool
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To show the datas of PAR, CO₂ concentration and CO concentration in phone by working with corresponding meters.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Theta | Vsensor |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 3.0 (8 ratings) |
| Positive reviews | 100.0% of reviews — better | 60.0% of reviews |
| Number of ratings | 1 | 8 — better |
| Update frequency | Monthly | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPod |
| Requires iOS | 11.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 13 MB | 70 MB |
| Age rating | 12+ | 4+ |
| Developer | Mikhail Fedorov | 健成 李 |
Customer experience
Theta
Vsensor
In-app purchases
Theta
No in-app purchases
Vsensor
No in-app purchases
Questions
Is Theta free?
Is Vsensor free?
Which has better reviews, Theta or Vsensor?
Do Theta or Vsensor have ads?
Which is updated more often, Theta or Vsensor?
Other comparisons
