Stochastic Signal Processing vs iPTE
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.
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.
- Extensive element data
- Over 5500 isotopes
- Solubility chart
- Element images and electron configurations
- Discovery history
- Search functionality
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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.
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Verdict
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
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.
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.
| Parameter | Stochastic Signal Processing | iPTE |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.7 (6 ratings) — better | — |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 6 — better | — |
| Update frequency | Every 5 weeks — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 73 MB | 98 MB |
| Age rating | 4+ | 4+ |
| Developer | Ian Young | 建锋 宋 |
Customer experience
Stochastic Signal Processing
iPTE
In-app purchases
Stochastic Signal Processing
No in-app purchases
iPTE
No in-app purchases
Questions
Is Stochastic Signal Processing free?
Is iPTE free?
Do Stochastic Signal Processing or iPTE have ads?
Which is updated more often, Stochastic Signal Processing or iPTE?
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