Comparison

Stochastic Signal Processing vs iPTE

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

iPTE

Explore the periodic table with extensive data on chemical elements and over 5500 isotopes. Features include element images, electron configurations, discovery history, and a solubility chart. Ideal for students, teachers, and science enthusiasts.

Highlights
  • Extensive element data
  • Over 5500 isotopes
  • Solubility chart
  • Element images and electron configurations
  • Discovery history
  • Search functionality
Features
Read full description

This fact-filled, image-rich app is the only periodic table you need. In the app You will find a huge amount of data about chemical elements. More than 5500 Isotopes of all the element are also in the app. You will learn a lot of new and useful for yourself, ideal if you're a student, teacher or just have an interest in the chemical sciences or nuclear sciences. The table has a long-form approved by the International Union of Pure and Applied Chemistry (IUPAC) as the core. Besides the elements, you can use the Table of solubility. - When you move your finger on any element provides information that is constantly updated. - Every item have an image of element and an image of electron configuration. - Discovery history. - Solubility Chart. - To find any element you can use the search by typing any character. - More than 5500 Isotopes of all the element. - Animation engarded to show the information. - IUPAC Naming or CAS Naming as your choice.

Screenshots

Stochastic Signal Processing4 screens
iPTE4 screens

Verdict

The call

The clearest difference is price: Stochastic Signal Processing at Free against iPTE's $1.99. Stochastic Signal Processing also leads on update cadence (every 5 weeks vs every 9 months). iPTE's advantage is review sentiment (100% vs 67%) and iOS requirement (13.0 vs 15.0). On ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Stochastic Signal Processing is free to download; iPTE costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Stochastic Signal Processing ships an update every 5 weeks, iPTE every 9 months. The most recent releases landed on September 25, 2026 and September 22, 2026 respectively.

Scorecard5 real differences · 5 level
Stochastic Signal Processing versus iPTE: the parameters behind the verdict, then further details
ParameterStochastic Signal ProcessingiPTE
PriceFree — better$1.99
Rating4.7 (6 ratings) — better—
Positive reviews66.7% of reviews100.0% of reviews — better
Number of ratings6 — better—
Update frequencyEvery 5 weeks — betterEvery 9 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.013.0 — better
Further details — not scored
Size73 MB98 MB
Age rating4+4+
DeveloperIan Young建锋 宋

Customer experience

Stochastic Signal Processing

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

iPTE

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Stochastic Signal Processing

No in-app purchases

None

iPTE

No in-app purchases

Questions

Is Stochastic Signal Processing free?
Stochastic Signal Processing is free to download, with no in-app purchases.
Is iPTE free?
iPTE costs $1.99, with no in-app purchases.
Do Stochastic Signal Processing or iPTE have ads?
Neither Stochastic Signal Processing nor iPTE shows ads.
Which is updated more often, Stochastic Signal Processing or iPTE?
Stochastic Signal Processing ships an update every 5 weeks, and iPTE every 9 months. Most recently, Stochastic Signal Processing was updated on September 25, 2026 and iPTE on September 22, 2026.

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