AngularQM vs PE.Mech
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-.
PE.Mech
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This app is aimed at mechanics part and includes 11 experiments about: kinematics, Newton's laws of motion, work and energy, momentum and impulse, periodic motion etc. It has some features: 1. You can set ideal conditions, for example: friction=0, air resistance=0, any gravity acceleration; 2. Show changing physical values by function diagram, free body diagram, energy diagram etc in real time to compensate for the lack of real experiments; 3. You can set any reasonable parameters to see different results, and calculate them by the descriptions to test your understanding; 4. Suitable for use in high school and college students; I hope this app can help you in your physics learning.
Screenshots
Verdict
The clearest difference is update cadence: PE.Mech at every 2 months against AngularQM's every 49 months. PE.Mech also leads on price ($0.99 vs $4.99) and iOS requirement (15.0 vs 26.4). AngularQM's advantage is device support (3 vs 1). On 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
AngularQM costs $4.99 and PE.Mech $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
AngularQM ships an update every 49 months, PE.Mech every 2 months. The most recent releases landed on July 4, 2026 and September 11, 2026 respectively.
| Parameter | AngularQM | PE.Mech |
|---|---|---|
| Price | $4.99 | $0.99 — better |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 49 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 26.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Gabriel Raffa | 巍 顾 |
In-app purchases
AngularQM
No in-app purchases
PE.Mech
No in-app purchases
