# Audio Function Generator PRO vs Tone Generator EM

The clearest difference is review sentiment: Audio Function Generator PRO at 88% against Tone Generator EM's 0%. Audio Function Generator PRO also leads on in-app purchases (none vs 1) and ads (none vs shown). Tone Generator EM's advantage is price (Free vs $9.99) and iOS requirement (13.0 vs 15.5). On update cadence and device support there is nothing between them.

Tone Generator EM is free to download; Audio Function Generator PRO costs $9.99 up front. Tone Generator EM sells 1 one-off in-app purchase. Audio Function Generator PRO asks for nothing beyond the download.

Audio Function Generator PRO holds the better App Store score, 4.8 against 4.4. That said, the two scores are not equally well evidenced: Audio Function Generator PRO has 269 ratings behind it against 36, so its average is the more settled of the two. Written reviews point the same way: 88% of Audio Function Generator PRO's written reviews are positive against 0% of Tone Generator EM's.

Audio Function Generator PRO ships an update every 6 weeks, Tone Generator EM every 2 months. The most recent releases landed on September 25, 2026 and August 25, 2026 respectively.

## The numbers

| Metric | Audio Function Generator PRO | Tone Generator EM |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.8 (269 ratings)](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703/reviews)** | [4.4 (36 ratings)](https://appshunter.io/ios/app/tone-generator-em-1/id1609613195/reviews) |
| Number of ratings | **269** | 36 |
| Positive reviews | **87.9% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | **#196** | — |
| Size | 13 MB | 6 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [myrApps](https://appshunter.io/developer/954211898) |

## What reviewers say

### Audio Function Generator PRO

[App page](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703)

**Currently charting:** #196 Top Paid · Music (US App Store)

Generate various audio test tones, including sine, square, and sawtooth waves. Explore frequency and volume sweeps, custom presets, and different types of noise. Advanced settings allow for fine-tuning signal parameters and creating complex multi-tone sequences.

**Highlights:** Generate sine, square, triangular, and sawtooth tones, Frequency and volume sweep generation, Customizable presets and configurations, Multiple noise types (White, Pink, Violet, etc.), Advanced signal parameter control, Multi-tone and dual function generation

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

**In-app purchases:** none

**What reviewers like**

- ✨ Superb craftsmanship and work
- 🚀 Excellent performance on older devices
- 💡 History feature is a great addition
- 👍 Versatile and powerful app
- 🎶 Great for binaural beats and sound creation

**What reviewers complain about**

- 📉 Linear sweep is useless
- ❓ Missing PWM functionality
- ❓ Missing Terzrauschen (third-octave noise)
- 🐛 Volume button issues
- 🐛 GUI is bad

**Reported bugs**

- Volume button issues (jumps up and down, displays wrong level)
- Update crashes on iPad Air2 when changing screens
- App opens AppStore repeatedly after purchase
- Buttons don't respond, settings don't keep
- Frequencies stick, program is useless

**Requested features**

- Logarithmic sweeps and frequency slider scale
- PWM functionality
- Terzrauschen (third-octave noise)
- Ping-pong sweeps in Multitone windows
- Sweeping of noise/adding noise in Multitone sweep with sweeping bandpass filter


### Tone Generator EM

[App page](https://appshunter.io/ios/app/tone-generator-em-1/id1609613195)

Generate sounds across a wide frequency range to test hearing, tune instruments, or experiment with audio. Easily select frequencies with a slider, adjust volume, and play tones.

**Highlights:** Generate sounds from 1Hz to 22kHz, Test hearing and audio equipment, Tune musical instruments, Intuitive frequency slider, Adjust volume, Note list with corresponding frequencies

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Lifetime Upgrade | $3.99 | one-time |


## Frequently asked questions

### Is Audio Function Generator PRO free?

Audio Function Generator PRO costs $9.99, with no in-app purchases.

### Is Tone Generator EM free?

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

### Which has better reviews, Audio Function Generator PRO or Tone Generator EM?

Audio Function Generator PRO is rated higher. Audio Function Generator PRO averages 4.8 out of 5 from 269 ratings, while Tone Generator EM averages 4.4 from 36 ratings.

### Do Audio Function Generator PRO or Tone Generator EM have ads?

Tone Generator EM shows ads; Audio Function Generator PRO does not.

### Which is updated more often, Audio Function Generator PRO or Tone Generator EM?

Audio Function Generator PRO ships an update every 6 weeks, and Tone Generator EM every 2 months. Most recently, Audio Function Generator PRO was updated on September 25, 2026 and Tone Generator EM on August 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.*