# King of FM: DX Synth/E Piano — #1 DX7 Sounds & Electric Piano

> 80s FM synth and electric piano sounds with 300+ presets and AUv3 plugin. (iPhone/iPad app by AudioKit Pro.)

- Source: https://appshunter.io/ios/app/king-of-fm-dx-synthe-piano/id1672644102 (this page in markdown: same URL + `.md`)
- Developer: [AudioKit Pro](https://appshunter.io/developer/1307785645)
- Category: Music, Education
- Price: Free
- Rating: 4.90/5 from 1,762 App Store ratings · 238 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.4 · 365 MB
- Languages: American English
- Released: 2023-05-02
- Data updated: 2026-08-29
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/king-of-fm-dx-synthe-piano/id1672644102/reviews.md

## What is King of FM?

Classic & New presets, inspired by retro 80s FM Synthesizers used on countless hits! 
It's like getting a DX7 & SY77 in the palm of your hand.
This is a FREE Premium app: No ads. No subscriptions. 
Full app, Everything is included!

INCLUDES 300+ UNIQUE AND LAYERED SYNTH INSTRUMENT SOUNDS!
PLUS, Includes sounds from FM Player (This app is the NEW Version of FM Player 2)

This app contains Analog Matthew's exclusive “Holy Grail” DX7 samples used by Herbie Hancock in the studio. Plus, this app is used by producers for Sting, Jay-Z, Alicia Keys, John Legend, and more!

"Dope! It's in my bag for every session" - Henny tha Bizness, Grammy-winning Producer
“Sounds authentically like the original hardware” – Electronic Musician magazine
"Proves the iPad can be a great sounding, viable synth.” – MATRIXSYNTH.com

"KING OF FM is possibly the BEST FREE iOS MUSIC APP, EVER!" - The GarageBand Guide

PROFESSIONAL! This app can be used as a live instrument controlled with a MIDI Keyboard. 
EXPRESSIVE! The main "E Piano" and "Full Tines" sounds have 20+ layers for maximum expressiveness.
Playing live with keyboard supports MIDI Mod Wheel, Pitch Wheel, Program Change, Velocity sensitive sounds, and Sustain Pedal support – All included!

“This app filled my eyes with tears when I first played through the sounds. It brought back memories of my youth, I was transported to a time when anything and everything was possible.” - A grateful musician

AWESOME FEATURES:

• Standalone iPhone/iPad app & iOS AUv3 Plugin

• Over 300+ Presets and over 10,000+ individual samples to inspire you

• FX: Phaser, Chorus, Reverb, Ping-pong delay, Crush, Stereo Fatten, and more!

• Compact! Over 2+ gigabytes of sounds compressed to under 400 mb

• Audio recording: Record your sounds then export wav files! No other apps needed

• Use as an iOS Plug-in in hosts like GarageBand, AUM, Cubasis, Beatmaker 3, and more

• Run on your silicon Mac (Standalone version)

• Includes full lifetime license for both iPhone, iPad, and Silicon Mac

*** We are all volunteers, we do not get paid anything to make this app. We would be humbled if you checked it out. 100% of any proceeds from other apps go to support the AudioKit open-source project ***

Make some music, and share it. Tag us. We want to hear YOU!

LEARN MORE:
audiokitpro.com/kingfm

KING OF FM is the reboot of FM Player. For the first time, these award-winning sounds are available for iPhone & Silicon Mac. It’s no longer the sound of the past. These sounds are being used on hit records now. This app is the sound of TODAY!

** This app has no official affiliation with Yamaha or the DX7, DX7II, or SY77. 
KING OF FM is a free project to bring the joy of music-making to the world. We appreciate Yamaha's beautiful instruments.

** This app has no official endorsement with any artist or producer named in the description (including Herbie Hancock, Jay-Z, Drake, etc). We are humbled they have used our apps. They have received no payment or otherwise compensation for using our apps. :)

## Key features

- 300+ unique synth instrument sounds
- DX7 and SY77 inspired presets
- 20+ layers for expressive sounds
- Standalone app and AUv3 plugin
- Includes Phaser, Chorus, Reverb, Delay, and more FX
- Audio recording and WAV export
- MIDI keyboard support

## What do users think of King of FM?

Overall sentiment: positive

**Pros**

- 🚀 Excellent sound quality
- 👍 Intuitive and easy to use interface
- 🎹 Authentic DX7 sounds
- 💰 Free app with great value
- 🎨 Versatile sound design capabilities
- 🎶 Inspiring and fun to play

**Cons**

- 🐛 Occasional compatibility issues with DAWs
- 🔇 Limited bass and low-end sounds
- 🔍 Lack of advanced editing features

**Commonly reported bugs**

- Recording function sometimes doesn't work
- MIDI sync issues with certain devices

**Most requested features**

- Add more bass and low-end sound options
- Improve compatibility with popular DAWs
- Implement advanced sound design tools
- Provide a scale editor for more precise tuning

## Recent user reviews (10 of 238)

All indexed reviews: https://appshunter.io/ios/app/king-of-fm-dx-synthe-piano/id1672644102/reviews.md

### 5/5 — Awesome feature

*2026-07-18*

That is a must have, thanks for the dev to bring up that pepite!

### 4/5 — Good but thin.

*2026-07-10, version 1.8.5*

I own most of the software from this company based on how consistent they keep coming with the classics but for my ears they don’t hold up in the soulfulness of the originals. I end up buying more expensive software because these just don’t do it for me. The ui is ok. I like the developer but there’s way better out there if you’re serious.

### 5/5 — WHY IS THIS FREE?!?!?!?

*2026-07-05, version 1.8.5*

>this app b great
>now i dont have 2 buy old dx7 that dont work no more bcuz it b old
>this app b new and b sound just like dx7
>if u b the rich kid down the street from me in 1989 it sound like your dx7 ii fd w/ e! that i b always go 2 ur house 2 play even doe i dont like u
>charge me $$$$ now app man or ladee

### 5/5 — Best one

*2026-07-01, version 1.8.5*

It is the best game everrrr!

### 5/5 — Fire

*2026-06-20, version 1.8.5*

Every synth these guys drop is fire!!!

### 5/5 — It’s Excellent

*2026-05-30*

Fr, this program cooks. I find it hard to be nostalgic for the good old days of flirting with high end gear at the music store or wishfully watching pros on the television summoning instant mood with ethereal pads. It’s all right here on my phone now. Bluetooth midi controller and a sequencer and it all works intuitively.  Buy this and every other thing they make. The bang is worth the buck, and the buck is worth the bang, ehrytime…

### 5/5 — Great app

*2026-05-26*

Just a great free app to play some cool synth sounds

### 4/5 — Scroll?

*2026-05-23, version 1.8.4*

Is there a scroll option for the keyboard note selection? If so I havent found it yet

### 5/5 — Yup🫡

*2026-05-13, version 1.8.3*

Another top shelf synth by this Team‼️

### 5/5 — Synth hobbyist

*2026-05-09, version 1.8.3*

Super fun synth easy to use fun sound design tools

## Frequently asked questions about King of FM

### What kind of sounds does King of FM offer?

King of FM provides over 300 unique and layered synth instrument sounds, heavily inspired by classic 80s FM synthesizers like the DX7 and SY77. It also includes electric piano sounds with extensive layering for maximum expressiveness.

### Is this app free to use?

Yes, King of FM is a completely free app with no ads or subscriptions. You get the full app with all features and sounds included for a lifetime license on iPhone, iPad, and Silicon Mac.

### Can I use this app with a MIDI keyboard?

Absolutely. The app is designed for professional use and supports live instrument control with a MIDI keyboard. It includes support for MIDI Mod Wheel, Pitch Wheel, Program Change, velocity-sensitive sounds, and sustain pedals.

### What platforms is King of FM available on?

King of FM is available as a standalone app for iPhone and iPad, and also functions as an AUv3 plugin within hosts like GarageBand, AUM, and Cubasis. The standalone version can also run on Silicon Macs.

### Can I record and export my music with this app?

Yes, the app includes audio recording capabilities. You can record your sounds directly within the app and then export them as WAV files, eliminating the need for other applications for basic audio capture.

## Version history (last 5 releases)

### 1.9 — 2026-07-17

Thanks Everyone! FREE UPGRADE:
• NEW: MICROTONALITY
Explore new sonic territory with 150+ curated microtonal scales, including North Indian scales, Hexanies, and scales by Irv Wilson, Marcus Hobbs, and more.
• Import Scala .scl tuning files and bring your own custom scales into the app.

• NEW: WORLD SCALES
Explore 60+ international scales with selectable root keys. Choose from Arabic, Egyptian, Eastern, and other world scales, then pick the base key that fits your song.

• NEW: WESTERN KEY + SCALE SUPPORT
Choose a key like C minor, Bb, F minor, and more. Select from Major, Minor, Blues, Pentatonic, and other familiar scales.
Keep your arps, sequences, and external MIDI locked to a Western scale, world scale, or go fully microtonal.

• NEW: PRESETS SAVE THEIR KEY AND SCALE
Want Preset #17 to always load in D minor? Now it will. Save presets with the correct key and scale for songs, live sets, and performance patches.
• NEW: AUv3 STATE SAVING FOR TUNING AND SCALE
Your tuning and scale settings are now saved properly inside AUv3 sessions.
• NEW: TUNE LOCK
Tune Lock button starts unlocked, so presets can load with their saved tuning. Tap the lock icon to keep the same tuning while changing presets.

• NEW: PROGRAM CHANGE MIDI MAPPING
You can now use a custom MIDI CC to change presets. Go to the About Page [i], tap “MIDI Mapping,” then “Add/Edit Mapping.” Choose “Program Change,” then enter the CC you want to use.

PLUS: More improvements under the hood. This is a big leap forward
Thanks for supporting the app,
Analog Matthew

### 1.8.5 — 2026-06-03

Thanks! Quick fixes and updates
This app will get better and better!

### 1.8.4 — 2026-05-19

THANKS EVERYONE!
• NEW: MIDI Clock In can now be toggled off
Tap the Tempo readout to turn MIDI Clock In on/off
NOTE: Tempo readout turns green when MIDI Clock is controlling it
• iPhone AU View improvements
• Fixes sequence sound cutting out while scrolling presets 
MORE FREE UPDATES TO COME! BETTER & BETTER!

### 1.8.3 — 2026-05-05

Thanks everyone! Quick fixes & updates for AUv3 LFOs!

### 1.8.2 — 2026-04-23

Thanks Everyone! 
• Improved Timing:
++ MIDI Clock Input added to Standalone Mode 
++ Arps & Sequencer in Cubasis starts on first Beat
MORE UPDATES COMING SOON! :)

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All apps by AudioKit Pro: https://appshunter.io/developer/1307785645

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*