# DXi FM synthesizer — user reviews > 153 indexed App Store user reviews of DXi FM synthesizer by Takashi Mizuhiki, rated 4.30/5 from 19 ratings. - Source: https://appshunter.io/ios/app/dxi-fm-synthesizer/id370138065/reviews - App overview in markdown: https://appshunter.io/ios/app/dxi-fm-synthesizer/id370138065.md - Rating breakdown: 5★ 12 · 4★ 4 · 3★ 1 · 2★ 0 · 1★ 2 ## Newest reviews (17 of 153) ### 2/5 — 堀さん *2025-10-03* FM音源は多くのメーカーが出しているが、これより良い物は無いと思う。驚異的な完成度。 2025年10月追記 今は良いFM音源が多く有るので、優位性は無くなったと思う。 ### 4/5 — DXI *2017-01-23* Much better than you would think to look at it ### 4/5 — Not a DX7, but close enough. *2017-01-12* This app is really good for anyone wanting to add basic FM sounds to their mix. It has a few DX algorithms that allow you to tweak and alter the preset sounds to get some really strange effects. And it's got those thumping DX synth basses for hip-hop and EDM. The sound isn't as smooth and polished as you would get from a real DX, never mind Native Instruments FM8 or the Synclavier V. It reminds me more of the CZ1 from Casio or the Volca FM from Korg. Still, other than Casio's iCZ, this is the best FM/ PD synth app out there. ### 4/5 — Overall the best 4 Operator FM synth for iOS *2017-01-11* Don't get me wrong, I still like FM4. However, DXi would get a fifth star if it had an LFO separate form the Mod Wheel and detuning features. Pitch envelopes would be nice too. While the FM4 has the advantage of LFOs, different sound engines, more flexible settings, and an arpeggiator, it suffers from being abandoned. DXi has the advantage of being more up-to-date, being universal, it sounds just as good, option to turn off anti-aliasing, a true sequencer, better MIDI (I assume), full control of pitch in ratio or fixed mode, more pleasing interface, etc. ### 5/5 — Hands down the easiest FM synth on iOS *2016-12-27* I'm really glad the developer keeps providing support to this little jewel of a synth. Comparing this app with it's closer adversaries (FM4, TX7, iYM2151) DXi still wins. I'll tell you why: DXi has the easiest way to fiddle with FM parameters via the ADSR screen. Also, DXi has a recorder, MIDI capable, ACP and Audiobus ready, making it easy to integrate to your sonic arsenal. I'm still hoping for the capability of opening SYX files from old FM synths like the 4-OP Yamaha TX81Z. That would make this app the king FM synth to have. ### 4/5 — Small is beautiful *2016-12-11* Simplement excellent... et pour un prix cadeau. Merci! Prochaine étape: Audio unit? ### 5/5 — Good. *2016-12-04* I like this synth. Many great, unique sounds. Works well with Cubasis. Great bells and pads. ### 5/5 — ダンパーペダルに反応しない、、 *2016-11-10* 簡単オペレーションで誰でも、FM音源の音作りについて、さわりは理解できると思う。この価格でこの音と操作性は良い。 しかし、MIDIでシンセと繋いで弾いたところ、何故かダンパーペダルを踏んでも、このアプリは反応してくれない。不具合なのでしょうか？。 →ご対応頂きありがとうございます！ ### 5/5 — Yes this is a reliable one ! And now also sustain Ped.! *2016-11-08, version 3.10.0* Yea this is truely inspiring little synth that sounds absolutely grate. And yes you can professionally use that one. The new upgrade brings long awaited sustain pedal support... that's a small but important thing on a synth that is so useful specialy for chords and layer stuff. So again thanks a lot for your smart work and keep on like this! Greeting from port of Hamburg ### 2/5 — Pretty good, but.... *2016-11-07* Too small. Controls and sequencer need to get bigger for it to be enjoyable on my mini. Hope this happens soon. ### 5/5 — Love it! How about Audiobus Effects support? *2016-05-21* DX7 owner & guitar player here; I love this app! First: I appreciate not having to get out of my chair to play the DX7. Second: I think I could learn more about FM synthesis from this app than I ever could from standing at the DX7. Lastly, I wonder if you'd consider adding Audiobus Effects support? I'd love to play my guitar through my DXi … thanks again. ### 4/5 — D X I FM . Le 04/04/16/ *2016-04-04* audio Copy ne fonctionne pas SVP UNE MAJ SERRAIS VRAIMENT BIEN .LAUTRE ETOILE QUE JAIS ENLEVER QUAND VIENDRAS LA MAJ MERCI . ### 5/5 — Very nice fm synth *2016-03-12* There's an oscilloscope which is always cool in a synth and a nice delay and low pass filter. AB and also IAA instrument with transport bar. Good stuff! ### 3/5 — middle of the road *2016-01-15* Despite this app being quiet fun app, It is far from perfect. So don't go waiting To it get any better. Like the majority of Apps this is just like a toy. ### 3/5 — Great start, but needs more keyboard features *2015-12-31* This does work with a midi controller, but does not work with a sustain pedal. I had a DX100 years ago with four operators, and had a lot of fun programming it. This is a great start, but the keyboard could use some improvement, like the ability to make the keys bigger, and also a mono mode for the lead presets. Add that, and a midi event editor, and I will give it five stars. As a final note, there should be an option to toggle the slide function on the keyboard as it makes it next to impossible to do ascending glissando rolls. I would also like to point out that this is a limited version that does not include poly/ mono switch, no pitch bend range, no portamento, no speed control for the LFO filter wave forms, which are also incomplete, as there is no sample & hold or sample & hold x8. Although there is a white noise filter. This is not a true DX7 emulation, or it would have 6 operators instead of 4. There should also be 12 algorithms, but there appears to be only about 6. The ADSR on each operator should also have five points instead of four, although they do work well. One star off my earlier rating until an update comes out that includes the missing features. That being said, it's still not a bad app for free. ### 5/5 — A great app at an unreal price for what your getting... *2015-10-28* I primarily am a singer/songwriter/guitarist but have played many other instruments as well (bass, started on drums in 6th grade band and still play, etc.). Keys have always fascinated me but aside from adding crochet piano chords and pads on demos I really didn't get into them. Over the last 5 years I have been reading up, playing more and generally digging the various synths, electric pianos and organs I have been lucky to play. The iPad opened serious doors though because I could now try several different synths, etc. without buying more sound modules, electric pianos, controllers or VST's. My Novation controller into my interface and boom, I can enjoy tons of different sounds. I have went pretty crazy with the app purchases but with so many cool ones out there (and yes there is lots of crap too) I have a hard time not trying them when they go for a cup of coffee or less. DXi here is a great example of high quality sounds available for penny's on the dollars that they're worth. DXi has such a streamlined and easy to program interface that getting sounds and experimenting happens very quickly. The sequencer is a great touch as well as the .wav recorder. That recorder is great for skipping Audiobus and making a great loop or tone inside the app, recording it with the DXi recorder, export for more editing and mangling in an editor or DAW and then bring it to the project your working on or begin a new one with the idea as a great jumping off point. I can see whole songs getting their genesis from some experimenting with this app, the vibe and sounds are that good... Although most reviews are positive, I feel DXi is underated or at least a hidden gem. This app belongs in any iPad music makers toolbox regardless of the genre they lean to. Great work by the dev and it shows he cares by the steady updates over the course of a few years. ### 5/5 — Good fm engine *2015-10-04, version 3.8.0* I like this one. Has a strong sound. Incredible noise is possible, easy to manipulate, sounds lonesome and aggressive in one. Love it. ## Most critical reviews (10 lowest-rated) ### 1/5 — おすすめしません *2020-05-31* 最近のiOSでは正常に動作しません。 ### 1/5 — ios 8.4 *2016-04-18* What about people who wants to stay under IOS 8.1.2 ? Why IOS 8.4 required? ### 1/5 — Please add more features, very basic, I'd like my money back. *2015-12-25* This is far to simplistic to even be free, you can not even have different wave forms on different operators, this is more like a very cheesy romper then a synth, for the same price you can get so much better. PLEASE can I have my money back, I feel totally robbed by this poor excuse for an app. ### 1/5 — あれ？ *2013-02-13* アップデート後、鍵盤をタッチすると落ちます。 ### 1/5 — Bug depuis la dernière mise à jour!! *2013-02-13* L'application se referme aussitôt à chaque fois qu'on veut jouer dessus depuis la dernière mise a jour!... à corriger!.. Sinon quitte à faire des mises a jour, pensez aussi à l'adapter à l'écran de l'iPhone 5 maintenant!!.. Merci. ### 1/5 — NO MIDI *2012-10-29* Where do we set the midi channel on ipad 2???? Waiting for the upgrade. ### 1/5 — Messes with my iPhone *2012-08-18, version 3.3.3* The last two times I used this app, the display zoomed in by itself, and even when I closed the app, the display would not go back to normal without a hard reset. I'm afraid there might be a virus (don't take my word for it, I don't know for sure!) ### 1/5 — Not there yet *2012-03-18* This is promising app which emulates a 4-operator (aka four oscillator, but in FM you usually use at least one oscillator as a modulator) FM synthesizer like the DX-100 or TX-81Z. The sound is nice and it has a nice set of Yamaha-style algorithms (i.e. ways of wiring up your carrier and modulator oscillators), and a variety of waveforms (i.e. more than must sine waves) give you additional flexibility. Effects include a basic delay/chorus and fixed lowpass filter which can be used to cut some FM grunge for soft sounds. Audio cut and paste and a simple step sequencer are also nice. Unfortunately, the app is just not very usable because the sound keeps dropping out! Please keep working on it, because I would love to have a nice FM synth on the iPad!! ### 1/5 — Complicata con poche voci *2011-12-29, version 3.2.0* Solo 16 voci e poi tutto da inventare! Deluso per quanto costa!!!! Dove si possono trovare altre voci da importare? Altri synth fatti meglio! ### 1/5 — Needs Akai Synthstation support *2011-11-11, version 3.0.0* Sounds cool but is useless to me until then ## Most praised reviews (10 highest-rated) ### 5/5 — Beautiful synthesizer *2026-06-03* My introduction to synths on ios-this is the one that i absolutely loved starting out on, debate the sounds are truly remarkable ### 5/5 — Das Teil rockt *2025-08-16, version 3.10.0* Der typischeFM Klang, der direkt ins Hirn geht :) Und ausserdem auch perfekt, um FM-Synthese endlich zu verstehen. ### 5/5 — Bellissima *2021-03-04, version 3.10.0* Speriamo in un upgrade a sei operatori ### 5/5 — Its good! *2020-11-26* I feel like this FM synth is one of the best on mobile! You did a great job. However, I would like it more if you did more on the feedback control. There isnt as much feedback as you would find on other fm synths so that would be great if you fixed that! Anyway great synth! ### 5/5 — Great buy ! 😎 *2020-10-07* Just great to find a good FM synth for this price ! As others have said, some midi routing would be great. Also not sure how to save presets as yet but twenty minutes in and I am loving it !!! Domo arigato Tak-San ### 5/5 — Excellent DX7 Emulation *2018-10-09, version 3.10.0* This app is great for everyone wanting dx7 sounds in your hand, on the go, without a DAW. The only reason ive given it three stars is the lack of ability to change the keyboard size. The keys are too chunky for a mobile screen for some people, but it still works ### 5/5 — This is one of the best IOS on the store *2018-04-10, version 3.10.0* This is AMAZING, not only for the sounds but the layout is Super fast and intuitive, the step sequencer is the best so fare. I just with it could send notes out Worth the purchase ### 5/5 — buy it *2018-02-05* i’ve bought almost all of the midi keyboard apps currently available and i want to tell every perspective buyer that this one blends with real instruments (acoustic guitars, bass, drums) better than ANY of the high dollar synth apps out there and for a small fraction of the price. seriously, hundreds of dollars spent and this is the app that i end up using over and over when it’s time to add “keyboards” to human made music. buy it ### 5/5 — Great app *2018-01-06, version 3.10.0* This was a great app. Helped me out heaps when learning about FM. The Ui is intuitive and easy to use. Thanks guys! ### 5/5 — For that money you don't get a better synth *2017-01-23, version 3.10.0* This synthesizer is really awesome, great sounds, authentic, intuitive and easy to use. And the price is unbeatable --- *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 2026-08-25.*