# King of FM: DX Synth/E Piano — user reviews > 240 indexed App Store user reviews of King of FM by AudioKit Pro, rated 4.90/5 from 1,762 ratings. - Source: https://appshunter.io/ios/app/king-of-fm-dx-synthe-piano/id1672644102/reviews - App overview in markdown: https://appshunter.io/ios/app/king-of-fm-dx-synthe-piano/id1672644102.md - Rating breakdown: 5★ 1,631 · 4★ 85 · 3★ 30 · 2★ 7 · 1★ 9 ## 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 ## Newest reviews (19 of 240) ### 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. ### 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 — Perfeito *2026-05-08* Lindo som de DX7, simplesmente perfeito, todos app da Audiokit são fantásticos ### 5/5 — Da kungt *2026-05-05, version 1.8.2* Soo good ### 4/5 — Unwanted sustain *2026-04-25, version 1.8.2* I had been loving this synth. But suddenly it is now creating an obnoxious, unwanted sustain. After you play a little bit, this roaring sound builds up and even gets louder. It’s doing it on iPad and iPhone. Another clue that something is wrong is the read out for the tempo. As this unwanted sustain/noise carries on the temple number starts going up and down wildly. If you guys get this fixed, I will give you back five stars. ### 5/5 — Sehr schöne Sounds *2026-03-02* Einfaches Arbeit und Verändern der Sounds. Tolle App ### 5/5 — Indiana mentioned!!!! 🎉👏🙌🥳 *2026-03-02, version 1.8.1* haven’t really used it yet ### 5/5 — 5 Stars! *2026-02-15, version 1.8.1* Well hey, if Richard loves it… ### 5/5 — Sick 80s sound *2026-02-14, version 1.8.1* One track from back int day is LL Cool J I Need Love and this app has a sound that sounds just like the electric piano from it. I love it!! Annoyingly, and this is not the app at all but just the direction mobile devices have moved, I have no 3.5mm jack to output the audio so have to get a USB-C interface. ### 5/5 — Loving it *2026-02-08, version 1.8.1* A lot of these synth apps are overwhelming, this one is much more accessible ### 5/5 — The Best *2026-02-08, version 1.8.1* The devs are so kind to provide this amazing feature rich synth at no cost to the user. The real cost is their time, and for that I am very appreciative. Thank you so much. ### 5/5 — Amazing *2026-02-03, version 1.8* the sounds are fantastic very well made, thank you ### 5/5 — This developer *2026-01-29, version 1.8* Is the greatest! ### 5/5 — King of Synth *2026-01-09, version 1.7.2* This is one of the best FM synth I can think of. ### 5/5 — Amazing sounds, amazing app, but a MASSIVE PROBLEM. *2026-01-07, version 1.7.2* Amazing app. Only problem is now whatever I do, ever since I used a lot of instances of this in a song, it just doesn’t work anymore in GarageBand. I try reinstalling it, doesn’t work. Please fix this if you can. ### 5/5 — Fantastic *2026-01-06, version 1.7.2* Super awesome ### 5/5 — Amélioration sans paiement *2026-01-03, version 1.7.2* Ajoutez gratuitement le son à votre répertoire de bonne qualité de son ### 5/5 — Love the apps *2025-12-29, version 1.7.2* Great emulators great price you should check it out ### 5/5 — King Of Free Music Apps *2025-12-10, version 1.7.2* Great for playing around with basic keyboarding and more advanced effects features with an on-screen or connected MIDI keyboard, on iPad or on the Mac! Thank you very much for the free, high-quality music app! ## Most critical reviews (10 lowest-rated) ### 1/5 — Support ? *2025-07-09, version 1.7.1* Polyphony on iPad is great but buggy on iPhone also I emailed on 21 June & 27 June asking a simple question - can I use these synths in commercial releases as I can find no licensing information and cannot use them without this information ### 1/5 — Why? *2025-06-24, version 1.7.1* Literally stopped working!?!. Tried everything to make it work on GarageBand. And it simply won’t anymore?. ### 1/5 — version 1.6.0 failing validation in Logic Pro for macOS *2024-08-27* It's all in the title. Doesn't work as a universal app. ### 1/5 — Horrível e cheio de bugs *2024-02-09* Impossível usar ao vivo, pois trava demais, o som simplesmente para de tocar. Simplesmente o pior App que eu já vi ### 1/5 — Samples? *2023-05-11, version 1.0.1* Being old enough to remember when FM was first released I honestly have to say that I was extremely disappointed when I loaded this app and found out that the entire app is a sample player of the sounds that can be make on the DX line of synthesizers… one of the best things about the DX synths was the ability to make your own crazy sound scapes and while the samples are of good quality I still find this app to be lacking the character and charm found in the DX… if you want to walk down memory lane than this app isn’t half bad… if you want to wrap your head around the fundamentals of programming FM synthesis than I would strongly suggest getting DX7v or Dexed as all the sound shaping parameters are there…. Thank goodness this app is free or I would’ve wasted money ### 2/5 — error *2025-12-04, version 1.7.2* I had this app and it was one of the best synths for my garageband, however, whenever i try to use it now m it says i can’t use it anymore and it is not installed and ruined all of my beats. I use ios so idk if that may be a reasons. ### 2/5 — Never say always *2025-05-22* ‘Always free’? I heard that word before when AudioKit started out. “AudioKit apps will always be free and ad free” Then you guys sold a bunch of your apps to be managed by someone else, and then they put subscriptions on them. So, please don’t say that when even this and some other apps can have the same destiny. Thank you! ### 3/5 — Bugs *2025-07-29, version 1.7.1* This app is really nice, it has really good sounds that other apps dont have for FREE, but for some reason if you use the extension on garageband, it just crashes and says the app isnt downloaded or something went wrong. I have to continuously redownload the a00whenever it says that. ### 3/5 — GarageBand iOS Problem *2025-07-19, version 1.7.1* If I have to be honest, I genuinely love this app. But there’s a huge problem that has made me want to pull every hair off of my scalp. Whenever I try to load up this app on GarageBand iOS, it refuses to load. And there’s a popup that gives two options; Reload or Disable. Reload doesn’t even work since when I press that option, it brings me back to the same popup no matter how many times I tap it and it really irks me. For the love of God, if you could please fix this issue, that would be amazing. Thank you. ### 3/5 — Does not work if FL STUDIO Mobile *2025-06-17, version 1.7.1* The synth one app works with FL STUDIO Mobile.. except this one doesn’t? Please fix this. I click IAA/Audiobus, and synth one shows up but not this one… please fix this :( ## Most praised reviews (10 highest-rated) ### 5/5 — Awesome! *2026-08-15, version 1.9* I highly recommend this and the rest of the “King of” series, I currently own them all. ### 5/5 — Amazing *2026-08-01, version 1.9* Great dx synth for iOS! ### 5/5 — Awesome feature *2026-07-18* That is a must have, thanks for the dev to bring up that pepite! ### 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, version 1.8.4* 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, version 1.8.4* Just a great free app to play some cool synth sounds ### 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 --- *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 2026-09-03.*