# Signals and Systems vs Phyzix

The clearest difference is update cadence: Phyzix at every 2 days against Signals and Systems's every 5 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Signals and Systems sells 6 in-app purchases, starting at $9.99 per month and Phyzix sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Signals and Systems ships an update every 5 weeks, Phyzix every 2 days. The most recent releases landed on October 7, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Signals and Systems | Phyzix |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 days** |
| Size | 18 MB | 8 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) | [Nguyen Ngoc Tan](https://appshunter.io/developer/1760541639) |

## 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 |


### Phyzix

[App page](https://appshunter.io/ios/app/phyzix-physics-lab/id6784482674)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Spark | $1.99 | per month |
| Orbit | $14.99 | per year |
| Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Signals and Systems free?

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

### Is Phyzix free?

Phyzix is free to download, with in-app purchases available.

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

Neither Signals and Systems nor Phyzix shows ads.

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

Signals and Systems ships an update every 5 weeks, and Phyzix every 2 days. Most recently, Signals and Systems was updated on October 7, 2026 and Phyzix on October 17, 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.*