Comparison

Stochastic Signal Processing vs Calcu

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

Calcu

This app provides advanced logarithmic calculations and explanations, covering equation solving, Taylor series, digit-by-digit computation, and integral definitions. It also simplifies expressions, solves complex logarithmic equations, and includes a virtual slide rule.

Highlights
  • Solves logarithmic equations for y, x, and a
  • Explains Taylor series for log_e(x)
  • Illustrates digit-by-digit log_10(x) computation
  • Explains log_e definition via integrals
  • Simplifies logarithmic expressions
  • Calculates and graphs complex logarithms
  • Includes virtual slide rule
Features
Read full description

Calcu-Logarithm performs calculations and helps user understand logarithms on advanced level: 1. Solves equation "y = log_a(x)” for “y”, “x”, and “a”, with relevant graphs. 2. Explains and illustrates how to compute log_e (x) from Taylor series. 3. Explains and illustrates how to compute log_10 (x) digit by digit (based on M.Goldberg algorithm). 4. Explains and provides proof of log_e definition as the integral of x inverse. 5. Simplifies logarithmic expressions and solves logarithmic equations with polynomials of up to 20th degree. 6. Includes virtual slide rule for multiplication and division. 7. Calculates, explains, and graphs logarithms of complex numbers. Developers welcome any feedback, please write to us at graphmath@aol.com. Please check out our other Math apps.

Screenshots

Stochastic Signal Processing4 screens
Calcu4 screens

Verdict

The call

The clearest difference is update cadence: Calcu at every 3 days against Stochastic Signal Processing's every 5 weeks. Calcu also leads on rating (5.0 vs 4.7). Stochastic Signal Processing's advantage is ratings volume (6 vs 1). 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

Calcu 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, Calcu every 3 days. The most recent releases landed on October 12, 2026 and October 2, 2026 respectively.

Scorecard3 real differences · 7 level
Stochastic Signal Processing versus Calcu: the parameters behind the verdict, then further details
ParameterStochastic Signal ProcessingCalcu
PriceFreeFree
Rating4.7 (6 ratings)5.0 (1 ratings) — better
Positive reviews66.7% of reviews—
Number of ratings6 — better1
Update frequencyEvery 5 weeksEvery 3 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size73 MB3 MB
Age rating4+4+
DeveloperIan YoungYuri Morozov

Customer experience

Stochastic Signal Processing

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

Calcu

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

In-app purchases

None

Stochastic Signal Processing

No in-app purchases

None

Calcu

No in-app purchases

Questions

Is Stochastic Signal Processing free?
Stochastic Signal Processing is free to download, with no in-app purchases.
Is Calcu free?
Calcu is free to download, with no in-app purchases.
Which has better reviews, Stochastic Signal Processing or Calcu?
Calcu is rated higher. Stochastic Signal Processing averages 4.7 out of 5 from 6 ratings, while Calcu averages 5.0 from 1 ratings.
Do Stochastic Signal Processing or Calcu have ads?
Neither Stochastic Signal Processing nor Calcu shows ads.
Which is updated more often, Stochastic Signal Processing or Calcu?
Stochastic Signal Processing ships an update every 5 weeks, and Calcu every 3 days. Most recently, Stochastic Signal Processing was updated on October 12, 2026 and Calcu on October 2, 2026.

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