# Stochastic Signal Processing vs iPTE

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.

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.

## The numbers

| Metric | Stochastic Signal Processing | iPTE |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.7 (6 ratings)](https://appshunter.io/ios/app/stochastic-signal-processing/id1450268179/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 9 months |
| Monetization | **Free** | Paid |
| Size | 73 MB | 98 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Ian Young](https://appshunter.io/developer/1450268178) | [建锋 宋](https://appshunter.io/developer/1098794568) |

## What reviewers say

### Stochastic Signal Processing

[App page](https://appshunter.io/ios/app/stochastic-signal-processing/id1450268179)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### iPTE

[App page](https://appshunter.io/ios/app/ipte/id1502419058)

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:** Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*