# Signals and Systems vs Voltios

The clearest difference is price: Signals and Systems at Free against Voltios's $0.99. Voltios's advantage is update cadence (every 2 weeks vs every 5 weeks) and chart position (#166 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Signals and Systems is free to download; Voltios costs $0.99 up front. Signals and Systems sells 6 in-app purchases, starting at $9.99 per month and Voltios sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Signals and Systems ships an update every 5 weeks, Voltios every 2 weeks. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Signals and Systems | Voltios |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/voltios-circuit-puzzles/id6779986359/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | — | Paid |
| Best chart rank | — | **#166** |
| Size | 18 MB | 6 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) | [Ignacio Noguerol Sicilia](https://appshunter.io/developer/6779954213) |

## What reviewers say

### Signals and Systems

[App page](https://appshunter.io/ios/app/signals-and-systems/id6739804680)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


### Voltios

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

**Currently charting:** #166 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 Signals and Systems free?

Signals and Systems is free to download, with in-app purchases available.

### Is Voltios free?

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

### Do Signals and Systems or Voltios have ads?

Neither Signals and Systems nor Voltios shows ads.

### Which is updated more often, Signals and Systems or Voltios?

Signals and Systems ships an update every 5 weeks, and Voltios every 2 weeks. Most recently, Signals and Systems was updated on October 7, 2026 and Voltios on October 25, 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.*