# Stochastic Signal Processing vs Voltios

The clearest difference is price: Stochastic Signal Processing at Free against Voltios's $0.99. Stochastic Signal Processing also leads on in-app purchases (none vs 1) and ratings volume (6 vs 1). Voltios's advantage is rating (5.0 vs 4.7) and update cadence (every 2 weeks vs every 5 weeks). On ads and device support there is nothing between them.

Stochastic Signal Processing is free to download; Voltios costs $0.99 up front. Voltios sells 1 one-off in-app purchase. Stochastic Signal Processing asks for nothing beyond the download.

Voltios 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, Voltios every 2 weeks. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Stochastic Signal Processing | Voltios |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.7 (6 ratings)](https://appshunter.io/ios/app/stochastic-signal-processing/id1450268179/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/voltios-circuit-puzzles/id6779986359/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#196** |
| Size | 73 MB | 6 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ian Young](https://appshunter.io/developer/1450268178) | [Ignacio Noguerol Sicilia](https://appshunter.io/developer/6779954213) |

## 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


### Voltios

[App page](https://appshunter.io/ios/app/voltios-circuit-puzzles/id6779986359)

**Currently charting:** #196 Top Paid · Education (US App Store)

A puzzle game that teaches the fundamentals of electricity through interactive circuit building. Explore various electrical concepts like switches, short circuits, and Ohm's law in a visually engaging and playful manner. Designed for families with no ads or tracking, offering a complete learning experience with a single purchase.

**Highlights:** Interactive circuit building, Learn electrical concepts visually, Explore switches, fuses, and Ohm's law, 68 levels across 9 worlds, Offline play, No ads or tracking

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Game | $4.99 | one-time |


## Frequently asked questions

### Is Stochastic Signal Processing free?

Stochastic Signal Processing is free to download, with no in-app purchases.

### Is Voltios free?

Voltios costs $0.99, and also offers in-app purchases.

### Which has better reviews, Stochastic Signal Processing or Voltios?

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

### Do Stochastic Signal Processing or Voltios have ads?

Neither Stochastic Signal Processing nor Voltios shows ads.

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

Stochastic Signal Processing ships an update every 5 weeks, and Voltios every 2 weeks. Most recently, Stochastic Signal Processing was updated on October 24, 2026 and Voltios on October 15, 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.*