AngularQM vs Arduino Science Journal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AngularQM
This app helps quantum mechanics physicists quickly obtain matrix representations of angular momentum operators. It calculates matrices for J squared, the z component of J, and ladder operators for chosen total angular momentum values.
- Matrix representation of angular momentum operators
- Calculates J squared matrices
- Calculates Jz component matrices
- Calculates ladder operator matrices (J+, J-)
- Supports various total angular momentum values (j)
- Visualizes matrix representations
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AngularQM is an application for physicists working in quantum mechanics. It allows quickly obtain the matrix representation of the operators involved in the construction of angular momentum in quantum mechanics. Once the total angular momentum of the quantum system under consideration has been chosen (j = 1/2, j = 1, j = 2, etc.) it is possible to calculate the matrices associated with the operator J squared and the z component of operator J. It is also possible to calculate and visualize the matrix representations of the ladder operators: J + and J-.
Arduino Science Journal
Transform your smartphone into a science notebook. Use your device's sensors and connect external hardware to gather real-time data, conduct experiments, and analyze findings. Ideal for students to explore the world scientifically.
- Use smartphone sensors
- Connect external Arduino sensors
- Record and analyze real-time data
- Conduct interactive experiments
- Enhance lesson plans
- Cross-platform support
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The Arduino Science Journal (formerly Science Journal, an initiative by Google) is free and allows you to gather data about the world around you by harnessing the sensors in your smartphone as well as sensors connected to Arduino. The Science Journal transforms smartphones and tablets into science notebooks that encourage students to explore their world. The Arduino Science Journal app is recommended for students from 10 to 18 years of age. About Arduino Science Journal With the Arduino Science Journal, you can learn interactively, conduct experiments and iterate on findings. • Enhance your existing lesson plans: use the Science Journal with activities and assignments you have already prepared • Classroom & home-school friendly: you don’t have to be in a classroom setting to start exploring. The Arduino Science Journal can be used to run experiments straight away, as long as you have your smartphone or tablet with you! • Move learning outside: the use of mobile devices along with the types of experiments we offer encourage students to get out of their seats and open their eyes to the world around them through the power of science • Science and data have no secrets: you can easily record your observations, store your data sensors in real-time and analyse them, just as a proper scientist! • Connect the digital and the physical world from your pocket: go through a series of simple tutorials and start having fun with science With built-in device sensors as well as external hardware, you can measure light, sound, movement, and much more. You can also compare results, and even set triggers. Together with the external hardware, (not included with the app), students are enabled to conduct more complex experiments, and advance in their scientific studies. As long as the external sensors are compatible with a Bluetooth-connecting device such as a microcontroller, there is no end to what experiments the students can make. Some popular sensors that the app can work with are: light, conductivity, temperature, force, gas, heart rate, respiration, radiation, pressure, magnetism, and many more. The app is classroom-friendly, since students can sign in on any device and access their experiments to continue exploring the world, wherever they are! Permissions notice: • Bluetooth: needed to scan for Bluetooth sensor devices. • Camera: needed to take pictures to document experiments and for the brightness sensor. • Photo Library: needed to store pictures taken to document experiments and for adding existing photos from your library to experiments. • Microphone: needed for sound intensity sensor. • Push notifications: needed to inform you of recording status when backgrounding the app. Benefits of using the Arduino Science Journal • It’s free and simple to use • Easy setup: download the app and start exploring with your phone’s built-in sensors • Cross-platform support • Portable: enhance your home learning or bring your device outside to study the world around you • Fully compatible with Arduino hardware: keep experimenting with the Arduino Science Kit Physics Lab, as well as the Arduino Nano 33 BLE Sense board • Google Drive integration, as well as local download --- Terms and Conditions: https://www.arduino.cc/en/sj-terms-conditions Privacy Policy: https://www.arduino.cc/en/privacy-policy Children's Privacy Policy: https://www.arduino.cc/en/privacy-policy/children-privacy-policy
Screenshots
Verdict
The clearest difference is price: Arduino Science Journal at Free against AngularQM's $4.99. Arduino Science Journal also leads on update cadence (every 3 months vs every 49 months) and ratings volume (1.1K vs 1). AngularQM's advantage is rating (5.0 vs 4.4) and in-app purchases (none vs 2). On ads and device support 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
Arduino Science Journal is free to download; AngularQM costs $4.99 up front. Arduino Science Journal sells 2 in-app purchases, starting at $7.99 per month. AngularQM asks for nothing beyond the download.
AngularQM holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Arduino Science Journal has 1.1K ratings behind it against 1, so its average is the more settled of the two.
AngularQM ships an update every 49 months, Arduino Science Journal every 3 months. The most recent releases landed on October 14, 2026 and October 21, 2026 respectively.
| Parameter | AngularQM | Arduino Science Journal |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 4.4 (1.1K ratings) |
| Positive reviews | — | 58.7% of reviews |
| Number of ratings | 1 | 1.1K — better |
| Update frequency | Every 49 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 26.4 | 15.1 — better |
| Further details — not scored | ||
| Size | 5 MB | 58 MB |
| Age rating | 4+ | 9+ |
| Developer | Gabriel Raffa | Arduino LLC |
Customer experience
AngularQM
Arduino Science Journal
Bugs and requests
AngularQM
Not enough reviews yet to summarise bugs or requests.
Arduino Science Journal
Reported bugs
4 issues- App often crashes when trying to add sensors
- Sensor selection menu doesn't work
- Freezes on loading dashboards with blank screen
- Stopped working after iOS 15 update
Requested features
5 requests- iCloud sync
- CSV export for data analysis
- Velocity sensors using GPS
- Arduino sensor integration
- Buzzer with variable range
In-app purchases
AngularQM
No in-app purchases
Arduino Science Journal
- Teacher Monthly Plan1 Month trial$7.991 Month
- Yearly Teacher Plan1 Month trial$63.991 Year
Questions
Is AngularQM free?
Is Arduino Science Journal free?
Which has better reviews, AngularQM or Arduino Science Journal?
Do AngularQM or Arduino Science Journal have ads?
Which is updated more often, AngularQM or Arduino Science Journal?
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