Federgraph vs quBit in 2D
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Federgraph
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Federgraph is a function plotter app to visualize a special built in function z = f(x, y) in 3D. The physical model behind the app is a system of springs. The built in function produces a variety of colorful pictures, some of which appear to have a face. Changing the parameters of the physical model will trigger a recalculation of the image.
quBit in 2D
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This app shows the two dimensional representation of Bloch sphere. Bloch sphere represents the state of the single qubit. Feel quantum!
Screenshots
Verdict
The clearest difference is in-app purchases: Federgraph at none against quBit in 2D's 3. On price, update cadence, 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
Both are free to download. quBit in 2D sells 3 one-off in-app purchases. Federgraph asks for nothing beyond the download.
Federgraph ships an update every 15 months, quBit in 2D every 11 months. The most recent releases landed on September 9, 2026 and September 15, 2026 respectively.
| Parameter | Federgraph | quBit in 2D |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 15 months | Every 11 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 29 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Gustav Schubert | Sungjun Kim |
In-app purchases
Federgraph
No in-app purchases
quBit in 2D
- coffee$0.99
- latte$4.99
- whopper set$9.99
Questions
Is Federgraph free?
Is quBit in 2D free?
Do Federgraph or quBit in 2D have ads?
Which is updated more often, Federgraph or quBit in 2D?
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