King of FM
King of FM is a free software synthesizer for iPhone, iPad, and Apple silicon Mac that gives musicians sampled FM and electric piano sounds.
What is King of FM?
King of FM is a music app and standalone software synthesizer designed for musicians who want classic FM-style keyboard sounds on Apple devices. It helps users play and record sampled synth and electric piano tones inspired by instruments such as the DX7, DX7II, TX81Z, and SY77. The app includes a large preset library and built-in effects, making it useful for songwriting, sketching ideas, live MIDI performance, and adding retro digital textures to productions. On Apple silicon Mac, it runs as a standalone app, while on iPhone and iPad it also supports AUv3 workflows for use with compatible hosts. King of FM is published by Audiokitpro and is aimed at players, producers, and mobile music creators who want quick access to expressive FM sounds without setting up hardware synthesizers.
Key features
- Play sampled FM synth and electric piano sounds from classic hardware-inspired sources
- Browse a large library of presets for songwriting, performance, and production
- Use built-in effects such as chorus, phaser, reverb, delay, and bit-crushing
- Record your performances and export audio for use in other projects
- Connect a MIDI keyboard for more expressive playing and control
- Run as a standalone app on Apple silicon Mac
- Use the iPhone and iPad version as an AUv3 instrument in compatible hosts
Review app leftovers with diCleaner
Inspect caches, support files, containers, and login items before cleaning.
Safety overview
Status: Mostly safe
This app’s purpose is consistent with a music instrument and audio-production workflow. Access to audio, file export locations, and MIDI-related features can be normal for recording and performance use. The bundle ID com.audiokitpro.kingoffm matches the product branding, but because installation details and local file locations are not available here, check that your copy is signed as King of FM from Audiokitpro before granting permissions or troubleshooting leftover files.
Recommendation: Keep King of FM if you use it for music creation, MIDI performance, or sound design on Apple devices. If you no longer use it, removing the app should mainly affect your access to its presets, recordings, and app-specific settings, so export any work you want to keep first.
Share your experience
Be the first to share your experience.