# Signals Generator vs SafetyCertification

The clearest difference is in-app purchases: SafetyCertification at none against Signals Generator's 14. SafetyCertification also leads on update cadence (every 3 weeks vs every 33 months). Signals Generator's advantage is device support (4 vs 2). On price, ads and iOS requirement there is nothing between them.

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

Signals Generator ships an update every 33 months, SafetyCertification every 3 weeks. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Signals Generator | SafetyCertification |
| --- | --- | --- |
| 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 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 15 MB | 9 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [怀卫 张](https://appshunter.io/developer/1252544375) | [PT CITRA INTERNATIONAL DIGITAL](https://appshunter.io/developer/1770950914) |

## 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 |


### SafetyCertification

[App page](https://appshunter.io/ios/app/safetycertification/id6737294921)

**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 SafetyCertification free?

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

### Do Signals Generator or SafetyCertification have ads?

Neither Signals Generator nor SafetyCertification shows ads.

### Which is updated more often, Signals Generator or SafetyCertification?

Signals Generator ships an update every 33 months, and SafetyCertification every 3 weeks. Most recently, Signals Generator was updated on October 7, 2026 and SafetyCertification on October 9, 2026.

---

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