Federgraph vs XSpecApp
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.
XSpecApp
This application displays EDXRF spectra, allowing users to manually identify elements, calculate ROIs, and add annotations. It supports saving, loading, and printing spectra with detailed information. The app can also acquire spectra using a digital pulse processor via USB, Serial, or wireless connections.
- Manual element identification
- ROI calculation for peaks
- Spectrum annotations
- Spectrum printing with ROIs
- Save and load spectra
- Acquire spectra via digital pulse processor
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XSpecApp displays EDXRF spectra providing the following capabilities: * Manual identification of elements * ROI (integrals) for identified peaks * Annotations on spectrum * Printing of spectrum with calculated ROIs * Saving and Loading of spectrum, with annotations and element information * NEW: Acquire spectra using an Amptek DP5 digital pulse processor. Supported interfaces are USB, Serial, and XSpecConnect (Wi-Fi and Bluetooth) . Please visit www.xrfconsulting.com for details on XSpecConnect.
Screenshots
Verdict
The clearest difference is in-app purchases: Federgraph at none against XSpecApp's 1. XSpecApp's advantage is update cadence (every 2 days vs every 15 months) and iOS requirement (8.0 vs 15.0). On price, 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. XSpecApp sells 1 one-off in-app purchase. Federgraph asks for nothing beyond the download.
Federgraph ships an update every 15 months, XSpecApp every 2 days. Both last shipped on September 9, 2026.
| Parameter | Federgraph | XSpecApp |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.5 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 15 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 29 MB | 48 MB |
| Age rating | 4+ | 4+ |
| Developer | Gustav Schubert | Brian Cross, XRF Consulting, LLC |
In-app purchases
Federgraph
No in-app purchases
XSpecApp
- XSpecApp$24.99
