Theta vs Luminometer
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
Read full descriptionHide full description
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.
Luminometer
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.
- 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
Read full descriptionHide full description
Luminometer is an exceptional app that is designed to transform your iPhone or iPad into a professional and user-friendly light meter. It is based on Internal Exposure Compensation, which makes it the most accurate lux meter available on the market today. With Luminometer, you can easily measure the lux of any light source in both lx and foot-candle units without having to spend any money on professional equipment. One of the standout features of Luminometer is the ability to swiftly and efficiently set up your greenhouse, living room, workplace, study room, or any other area with the perfect level of illumination. Our app ensures that you achieve a well-lit environment that is comfortable to work in without causing any unnecessary glare. The app is incredibly versatile, making it consistent for use in various lighting conditions such as plant lighting, household lighting, workstation lighting, and mood lighting. No matter the type of lighting you need to measure, Luminometer is up to the task. With Luminometer, you get a comprehensive set of features that enable you to measure lux with ease. The camera view feature allows you to view the area being measured, making it even more user-friendly. The app is calibrated using top reference equipment, ensuring that your measurements are always precise and reliable. Whether you're dealing with ambient indoor and outdoor lighting or task and accent lighting, Luminometer has you covered. You can trust that our app is accurate and reliable, thanks to our calibration process, which is done using the best reference equipment available. In conclusion, if you're looking for an accurate, versatile, and easy-to-use light meter app, then Luminometer is the perfect solution for you. Get started today and experience the benefits of using our app to achieve the perfect level of illumination for any environment. Terms and pricing: Our weekly subscription costs $3.99 USD/week and provides you with unlimited access to premium features, as long as your subscription remains active. The subscription automatically renews, and payment will be charged to your iTunes account when you confirm the initial purchase. If you do not wish to renew your subscription, you may turn off the auto-renewal option in your Account Settings at least 24-hours before the current subscription period ends. For more information, please refer to our terms of service available at https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ or privacy policy on https://27groupts.notion.site/Privacy-Policy-for-Luminometer-iOS-App-68f7e665c2924108a9111eae825e53c7
Screenshots
Verdict
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.
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. 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.
| Parameter | Theta | Luminometer |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 3.5 (16 ratings) |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 1 | 16 — better |
| Update frequency | Monthly — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 11.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 13 MB | 14 MB |
| Age rating | 12+ | 4+ |
| Developer | Mikhail Fedorov | 27GROUP |
Customer experience
Theta
Luminometer
In-app purchases
Theta
No in-app purchases
Luminometer
- Weekly$2.997 Days
- Lifetime$9.99
Questions
Is Theta free?
Is Luminometer free?
Which has better reviews, Theta or Luminometer?
Do Theta or Luminometer have ads?
Which is updated more often, Theta or Luminometer?
Other comparisons















