# Signals Generator vs 屏卫PRO

The clearest difference is in-app purchases: 屏卫PRO at none against Signals Generator's 14. 屏卫PRO also leads on update cadence (every 4 days vs every 33 months). Signals Generator's advantage is device support (4 vs 2) and iOS requirement (15.6 vs 17.0). On price and ads there is nothing between them.

Both are free to download. Signals Generator sells 14 one-off in-app purchases. 屏卫PRO asks for nothing beyond the download.

Signals Generator ships an update every 33 months, 屏卫PRO every 4 days. The most recent releases landed on October 7, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Signals Generator | 屏卫PRO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (29 ratings)](https://appshunter.io/ios/app/signals-generator/id1526653387/reviews)** | — |
| Number of ratings | **29** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 33 months | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 15 MB | 10 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [怀卫 张](https://appshunter.io/developer/1252544375) | [Shenzhen Zhengyilong Technology Co.,Ltd](https://appshunter.io/developer/932771087) |

## What reviewers say

### Signals Generator

[App page](https://appshunter.io/ios/app/signals-generator/id1526653387)

Transform your mobile device into a dual-channel signal generator for sound and audio electric signals. Offers a wide variety of waveform types and customizable parameters like amplitude, frequency, and phase. Ideal for professionals and hobbyists for signal generation and circuit measurement.

**Highlights:** Dual-channel signal generation, Multiple waveform types, Adjustable amplitude, frequency, and phase, Independent channel control, Zoomable waveform display, Interface color selection

**Features:** Vision Pro support

**In-app purchases (14)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sine Wave | $0.99 | one-time |
| Square Wave | $0.99 | one-time |
| Gaussian Noise | $0.99 | one-time |
| Uniformly distributed noise | $0.99 | one-time |
| Pink Noise | $0.99 | one-time |
| Red (brown) noise | $0.99 | one-time |
| Maximum Length Sequence | $0.99 | one-time |
| Rayleigh Noise | $0.99 | one-time |
| Sawtooth Wave | $0.99 | one-time |
| Gamma Noise | $0.99 | one-time |
| Functional Wave | $2.99 | one-time |
| Sweep Signal | $2.99 | one-time |
| All Noise Signals | $3.99 | one-time |
| All type of signals | $7.99 | one-time |


### 屏卫PRO

[App page](https://appshunter.io/ios/app/pro/id6812643787)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Signals Generator free?

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

### Is 屏卫PRO free?

屏卫PRO is free to download, with no in-app purchases.

### Do Signals Generator or 屏卫PRO have ads?

Neither Signals Generator nor 屏卫PRO shows ads.

### Which is updated more often, Signals Generator or 屏卫PRO?

Signals Generator ships an update every 33 months, and 屏卫PRO every 4 days. Most recently, Signals Generator was updated on October 7, 2026 and 屏卫PRO on October 13, 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.*