# Audio Function Generator PRO vs King of Digital D1

The clearest difference is chart position: King of Digital D1 at #112 against Audio Function Generator PRO's unranked. King of Digital D1 also leads on price ($7.99 vs $9.99) and ratings volume (1.3K vs 269). On rating, review sentiment, update cadence and ads there is nothing between them.

Audio Function Generator PRO costs $9.99 and King of Digital D1 $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.8 for Audio Function Generator PRO against 4.9 for King of Digital D1. Both are backed by a comparable volume of ratings — 269 and 1.3K respectively. Written reviews are what separate them: 88% of Audio Function Generator PRO's written reviews are positive against 92% of King of Digital D1's.

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Audio Function Generator PRO | King of Digital D1 |
| --- | --- | --- |
| Price | $9.99 | **$7.99** |
| Rating | [4.8 (269 ratings)](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703/reviews) | **[4.9 (1.3K ratings)](https://appshunter.io/ios/app/king-of-digital-d1-epic-synth/id6467825289/reviews)** |
| Number of ratings | 269 | **1.3K** |
| Positive reviews | 87.9% of reviews | **92.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#112** |
| Size | 13 MB | 444 MB |
| Requires iOS | 16.0 | **14.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [AudioKit Pro](https://appshunter.io/developer/1307785645) |

## What reviewers say

### Audio Function Generator PRO

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

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


### King of Digital D1

[App page](https://appshunter.io/ios/app/king-of-digital-d1-epic-synth/id6467825289)

**Currently charting:** #112 Top Paid · Music (US App Store)

This app is a virtual analog and PCM synthesizer inspired by iconic digital synths from the 80s, 90s, and 2000s. It offers over 900 presets, extensive sound design capabilities, and can be used as a plug-in in various DAWs.

**Highlights:** 64-voice Hybrid Digital PCM & VA Synth, 900+ Handmade Presets, Dual Layers per Voice, Vintage-style Step Sequencer, 3 LFOs with Fun Routings, Integrated FX Suite, AUv3 Plug-in Support

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🎨 Awesome sounds
- 🎹 Lots of usable presets
- 🎚️ Powerful and customizable
- 💰 Great value for money
- 🎶 Inspirational and creative

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- 🔌 Compatibility issues with some DAWs
- 🗂️ Favorites list can be unstable with many presets

**Reported bugs**

- High D key gets stuck on some devices
- Presets dropdown menu doesn't retract properly

**Requested features**

- Add arpeggiator functionality
- Improve sequencer and timing reliability
- Allow use on Mac devices


## Frequently asked questions

### Is Audio Function Generator PRO free?

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

### Is King of Digital D1 free?

King of Digital D1 costs $7.99, with no in-app purchases.

### Which has better reviews, Audio Function Generator PRO or King of Digital D1?

King of Digital D1 is rated higher. Audio Function Generator PRO averages 4.8 out of 5 from 269 ratings, while King of Digital D1 averages 4.9 from 1.3K ratings.

### Do Audio Function Generator PRO or King of Digital D1 have ads?

Neither Audio Function Generator PRO nor King of Digital D1 shows ads.

### Which is updated more often, Audio Function Generator PRO or King of Digital D1?

Audio Function Generator PRO ships an update every 6 weeks, and King of Digital D1 every 6 weeks. Most recently, Audio Function Generator PRO was updated on October 29, 2026 and King of Digital D1 on October 30, 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.*