Stochastic Signal Processing vs Pic2Mag
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stochastic Signal Processing
Explore the processing of random signals like speech, music, and climate data. This interactive textbook offers dynamic information, films, animations, and 59 real-time laboratory experiments using your device's camera and microphone. It's designed for those with prior signal processing and probability theory knowledge.
- Interactive textbook format
- Dynamic information display
- Films and animations
- 59 laboratory experiments
- Real-time signal processing
- Homework problems
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Speech, music, seismic vibrations, oil prices, and climate measurements are all examples of stochastic (random) signals. In this textbook—intended for individuals with prior training in introductory signal processing and introductory probability theory—we develop techniques to process such signals to extract useful information. We present case studies ranging from music to photographic images to oil prices to climate data to the motion of individual biomolecules. This textbook, as an interactive textbook ("iBook"), makes use of your device's ability to display dynamic information through films and animations and to hear the results of the techniques applied to music. At the end of every chapter there are homework problems ranging from easy to "olympic". We make use of your device's interactive capabilities to offer 59 laboratory experiments in signal processing. The experiments use the camera, the microphone, the speakers, and the graphical user interface. These experiments are not simulations; they are examples of real digital processing of signals in your device. In this time of at-home and online learning, this is the way to learn signal processing through study and experimentation.
Pic2Mag
Visualize magnetic and electric fields by drawing magnets or charges. This educational tool helps students understand physics concepts by displaying field lines and voltage potentials. It offers a free, ad-free learning experience for iOS devices.
- Draw magnets to visualize magnetic fields
- Draw charges to visualize electric fields
- Magnetostatic and Electrostatic modes
- Field line and voltage potential plotting
- Caches results for faster processing
- Ad-free learning experience
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The user draws the magnets and the Pic2Mag program draws the magnetic fields. The Field Calculator program now has a Magnetostatic mode, and an Electrostatic mode to plot either magnetic fields or electric fields. The program designed to help students learn Magnetic fields and Electric fields. You can draw magnets and look at the magnetic field, or you can draw electric charges and look at the electric voltage field. The best free magnetic science program you can download! No advertisements, it's just all app. The app can process most images in just a few minutes. The app caches it's results so the more that you use it, the faster the program processes images. Red pixels represent magnets with a North pole surface facing the observer, and Blue pixels represent magnets with a South pole surface facing the observer. Pink pixels represent positive electric charges, and Dark Purple pixels represent negative electric charges
Screenshots
Verdict
The clearest difference is update cadence: Stochastic Signal Processing at every 5 weeks against Pic2Mag's every 31 months. Stochastic Signal Processing also leads on ratings volume (6 vs 1). Pic2Mag's advantage is rating (5.0 vs 4.7) and iOS requirement (8.0 vs 15.0). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
Pic2Mag holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Stochastic Signal Processing has 6 ratings behind it against 1, so its average is the more settled of the two.
Stochastic Signal Processing ships an update every 5 weeks, Pic2Mag every 31 months. The most recent releases landed on September 25, 2026 and October 8, 2026 respectively.
| Parameter | Stochastic Signal Processing | Pic2Mag |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (6 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 6 — better | 1 |
| Update frequency | Every 5 weeks — better | Every 31 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 73 MB | 108 MB |
| Age rating | 4+ | 4+ |
| Developer | Ian Young | Michael Snyder |
Customer experience
Stochastic Signal Processing
Pic2Mag
In-app purchases
Stochastic Signal Processing
No in-app purchases
Pic2Mag
No in-app purchases
Questions
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