Comparison

AngularQM vs Arduino Science Journal

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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-.

About

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.

Highlights
  • Use smartphone sensors
  • Connect external Arduino sensors
  • Record and analyze real-time data
  • Conduct interactive experiments
  • Enhance lesson plans
  • Cross-platform support
Features
Read full description

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

AngularQM4 screens
Arduino Science Journal4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
AngularQM versus Arduino Science Journal: the parameters behind the verdict, then further details
ParameterAngularQMArduino Science Journal
Price$4.99Free — better
Rating5.0 (1 ratings) — better4.4 (1.1K ratings)
Positive reviews—58.7% of reviews
Number of ratings11.1K — better
Update frequencyEvery 49 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS26.415.1 — better
Further details — not scored
Size5 MB58 MB
Age rating4+9+
DeveloperGabriel RaffaArduino LLC

Customer experience

AngularQM

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Arduino Science Journal

All ratings1,109 ratings
Positive86.0%
Neutral3.4%
Negative10.6%
Written reviews75 reviews
Positive58.7%
Neutral5.3%
Negative36.0%

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

None

AngularQM

No in-app purchases

2 purchases

Arduino Science Journal

Subscriptions2
  • Teacher Monthly Plan1 Month trial$7.991 Month
  • Yearly Teacher Plan1 Month trial$63.991 Year

Questions

Is AngularQM free?
AngularQM costs $4.99, with no in-app purchases.
Is Arduino Science Journal free?
Arduino Science Journal is free to download, with in-app purchases available.
Which has better reviews, AngularQM or Arduino Science Journal?
AngularQM is rated higher. AngularQM averages 5.0 out of 5 from 1 ratings, while Arduino Science Journal averages 4.4 from 1.1K ratings.
Do AngularQM or Arduino Science Journal have ads?
Neither AngularQM nor Arduino Science Journal shows ads.
Which is updated more often, AngularQM or Arduino Science Journal?
AngularQM ships an update every 49 months, and Arduino Science Journal every 3 months. Most recently, AngularQM was updated on October 14, 2026 and Arduino Science Journal on October 21, 2026.

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