AngularQM vs Vector Gem
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-.
Vector Gem
Visualize and manipulate 3D vectors, lines, and planes with multiple input formats. Explore intersections with axes and coordinate planes, and customize object colors and display settings.
- 3D vector, line, and plane input
- Multiple input forms supported
- Display of starting points and direction vectors
- Calculation of intersection points
- Customizable object colors and display settings
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Vector Gem allows the input and three-dimensional display of vectors, lines and planes. The input supports different forms (e.g. linear equation, vector form, normalized form, ...) Vector Gem can display the starting point, the direction vectors and the normalized vector for each plane and calculate the intersection points with the axes. For lines it can display the starting point and the direction vector and calculate the points of intersection with the coordinate planes. The color can be selected for each object along with different settings for the display.
Screenshots
Verdict
The clearest difference is price: Vector Gem at Free against AngularQM's $4.99. Vector Gem also leads on update cadence (every 2 months vs every 49 months) and iOS requirement (14.0 vs 26.4). On ads, in-app purchases 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
Vector Gem is free to download; AngularQM costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
AngularQM ships an update every 49 months, Vector Gem every 2 months. The most recent releases landed on July 4, 2026 and September 24, 2026 respectively.
| Parameter | AngularQM | Vector Gem |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 49 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 26.4 | 14.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Gabriel Raffa | Fabian Langer |
Customer experience
AngularQM
Vector Gem
In-app purchases
AngularQM
No in-app purchases
Vector Gem
No in-app purchases
Questions
Is AngularQM free?
Is Vector Gem free?
Do AngularQM or Vector Gem have ads?
Which is updated more often, AngularQM or Vector Gem?
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