# Stochastic Signal Processing vs Calcu

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.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

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.

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.

## The numbers

| Metric | Stochastic Signal Processing | Calcu |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (6 ratings)](https://appshunter.io/ios/app/stochastic-signal-processing/id1450268179/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calcu-logarithm/id6698852208/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 days** |
| Monetization | Free | Free |
| Size | 73 MB | 3 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ian Young](https://appshunter.io/developer/1450268178) | [Yuri Morozov](https://appshunter.io/developer/1582368813) |

## 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


### Calcu

[App page](https://appshunter.io/ios/app/calcu-logarithm/id6698852208)

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:** macOS Compatibility

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