Comparison

Stochastic Signal Processing vs Pic2Mag

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Interactive textbook format
  • Dynamic information display
  • Films and animations
  • 59 laboratory experiments
  • Real-time signal processing
  • Homework problems
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

Stochastic Signal Processing4 screens
Pic2Mag4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Stochastic Signal Processing versus Pic2Mag: the parameters behind the verdict, then further details
ParameterStochastic Signal ProcessingPic2Mag
PriceFreeFree
Rating4.7 (6 ratings)5.0 (1 ratings) — better
Positive reviews66.7% of reviews—
Number of ratings6 — better1
Update frequencyEvery 5 weeks — betterEvery 31 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.08.0 — better
Further details — not scored
Size73 MB108 MB
Age rating4+4+
DeveloperIan YoungMichael Snyder

Customer experience

Stochastic Signal Processing

All ratings6 ratings
Positive83.3%
Neutral16.7%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

Pic2Mag

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Stochastic Signal Processing

No in-app purchases

None

Pic2Mag

No in-app purchases

Questions

Is Stochastic Signal Processing free?
Stochastic Signal Processing is free to download, with no in-app purchases.
Is Pic2Mag free?
Pic2Mag is free to download, with no in-app purchases.
Which has better reviews, Stochastic Signal Processing or Pic2Mag?
Pic2Mag is rated higher. Stochastic Signal Processing averages 4.7 out of 5 from 6 ratings, while Pic2Mag averages 5.0 from 1 ratings.
Do Stochastic Signal Processing or Pic2Mag have ads?
Neither Stochastic Signal Processing nor Pic2Mag shows ads.
Which is updated more often, Stochastic Signal Processing or Pic2Mag?
Stochastic Signal Processing ships an update every 5 weeks, and Pic2Mag every 31 months. Most recently, Stochastic Signal Processing was updated on September 25, 2026 and Pic2Mag on October 8, 2026.

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