# Tone generator vs Campos Electromagnéticos (CEM)

The clearest difference is in-app purchases: Campos Electromagnéticos (CEM) at none against Tone generator's 3. Campos Electromagnéticos (CEM) also leads on ads (none vs shown). Tone generator's advantage is update cadence (every 5 months vs every 16 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Tone generator sells 3 one-off in-app purchases. Campos Electromagnéticos (CEM) asks for nothing beyond the download.

Tone generator ships an update every 5 months, Campos Electromagnéticos (CEM) every 16 months. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Tone generator | Campos Electromagnéticos (CEM) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (152 ratings)](https://appshunter.io/ios/app/tone-generator/id457003837/reviews)** | — |
| Number of ratings | **152** | — |
| Positive reviews | 67.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 5 months** | Every 16 months |
| Monetization | Free with in-app purchases | — |
| Size | 27 MB | 27 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [michael heinz](https://appshunter.io/developer/292745639) | [Instituto Nacional de Seguridad e Higiene en el Trabajo](https://appshunter.io/developer/1019192741) |

## What reviewers say

### Tone generator

[App page](https://appshunter.io/ios/app/tone-generator/id457003837)

Create various periodic signals with adjustable frequency and amplitude for testing electronic circuits or tuning instruments. Features include a metronome, a real-time tuner, and options for generating different noise types and tone sequences. It also offers unique features for hearing tests and party games.

**Highlights:** Generate periodic signals, Adjustable frequency and amplitude, Integrated instrument tuner, Metronome for practice, Hearing ability tests, Generate white/pink noise, Create tone sequences

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Extra-Feature 1 | $1.99 | one-time |
| No advertising | $1.99 | one-time |
| Upgrade to full version | $3.99 | one-time |

**What reviewers like**

- 🚀 Works every time!
- 🚀 Awesome application for generating tones and studying sound
- 👍 Very useful
- 👍 Genius
- 👍 Great app to make your tones

**What reviewers complain about**

- 🐛 Doesn't go lower than 10hz
- 🔍 Ruined by ads
- 🔍 Way too many ads
- 🔍 Crashes before I can export even though I paid for the feature
- 🔍 Fake app. Buying the upgrade doesn't do anything. There is no support. You can't export like it says you can. It's a scam.

**Reported bugs**

- Doesn't go lower than 10hz
- Crashes before I can export even though I paid for the feature
- Fake app. Buying the upgrade doesn't do anything. There is no support. You can't export like it says you can. It's a scam.
- app is modified
- No tone

**Requested features**

- Wish I had a manual  that explains a couple functions
- More precise way to select the frequency
- Playing of multiple tomes
- Manually enter a frequency
- More than one voice


### Campos Electromagnéticos (CEM)

[App page](https://appshunter.io/ios/app/campos-electromagneticos-cem/id1521220922)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Tone generator free?

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

### Is Campos Electromagnéticos (CEM) free?

Campos Electromagnéticos (CEM) is free to download, with no in-app purchases.

### Do Tone generator or Campos Electromagnéticos (CEM) have ads?

Tone generator shows ads; Campos Electromagnéticos (CEM) does not.

### Which is updated more often, Tone generator or Campos Electromagnéticos (CEM)?

Tone generator ships an update every 5 months, and Campos Electromagnéticos (CEM) every 16 months. Most recently, Tone generator was updated on September 17, 2026 and Campos Electromagnéticos (CEM) on September 21, 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.*