# Stochastic Signal Processing vs Quadrilateral Calculator

The clearest difference is review sentiment: Stochastic Signal Processing at 67% against Quadrilateral Calculator's 0%. Stochastic Signal Processing also leads on price (Free vs $2.99) and update cadence (every 5 weeks vs every 23 months). Quadrilateral Calculator's advantage is rating (5.0 vs 4.7). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Stochastic Signal Processing is free to download; Quadrilateral Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Quadrilateral Calculator 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. Written reviews complicate that: 67% of Stochastic Signal Processing's written reviews are positive against 0% of Quadrilateral Calculator's, so the app with the better star average is not the one people write more warmly about.

Stochastic Signal Processing ships an update every 5 weeks, Quadrilateral Calculator every 23 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Stochastic Signal Processing | Quadrilateral Calculator |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.7 (6 ratings)](https://appshunter.io/ios/app/stochastic-signal-processing/id1450268179/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/quadrilateral-calculator/id1626770065/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 23 months |
| Monetization | **Free** | Paid |
| Size | 73 MB | 1 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ian Young](https://appshunter.io/developer/1450268178) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## 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


### Quadrilateral Calculator

[App page](https://appshunter.io/ios/app/quadrilateral-calculator/id1626770065)

Instantly solve any quadrilateral with this comprehensive calculator. Features multiple input modes, detailed calculations, and live visualization. Ideal for students, engineers, and geometry enthusiasts.

**Highlights:** Multiple input modes (coordinates, sides, diagonals, angles), Calculates perimeter, area, diagonals, and angles, Auto-identifies shape type, Live interactive canvas with drag-and-drop functionality, Step-by-step solutions with formulas, Unit conversion built-in, Random shape generator for practice

**Features:** macOS Compatibility, 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 Quadrilateral Calculator free?

Quadrilateral Calculator costs $2.99, with no in-app purchases.

### Which has better reviews, Stochastic Signal Processing or Quadrilateral Calculator?

Quadrilateral Calculator is rated higher. Stochastic Signal Processing averages 4.7 out of 5 from 6 ratings, while Quadrilateral Calculator averages 5.0 from 1 ratings.

### Do Stochastic Signal Processing or Quadrilateral Calculator have ads?

Neither Stochastic Signal Processing nor Quadrilateral Calculator shows ads.

### Which is updated more often, Stochastic Signal Processing or Quadrilateral Calculator?

Stochastic Signal Processing ships an update every 5 weeks, and Quadrilateral Calculator every 23 months. Most recently, Stochastic Signal Processing was updated on October 24, 2026 and Quadrilateral Calculator on October 24, 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.*