# SynthMaster One for iPhone — user reviews > 45 indexed App Store user reviews of SynthMaster One for iPhone by KV331 Audio, rated 4.80/5 from 329 ratings. - Source: https://appshunter.io/ios/app/synthmaster-one-for-iphone/id1490902617/reviews - App overview in markdown: https://appshunter.io/ios/app/synthmaster-one-for-iphone/id1490902617.md - Rating breakdown: 5★ 283 · 4★ 29 · 3★ 7 · 2★ 2 · 1★ 8 ## What do users think of SynthMaster One for iPhone? Overall sentiment: mixed **Pros** - ✨ Excellent sound quality - 🤩 Incredible features for free - 👍 Easy to use interface - 🎛️ Versatile sound design capabilities - 🎵 Great for GarageBand integration - 🎹 Impressive arpeggiator/sequencer - 💡 Powerful synth engine - 🚀 Fast performance (when working) - 📱 Well-designed UI on iPhone **Cons** - 🐛 Frequent crashes - 🔌 Issues with GarageBand integration - 💸 In-app purchase problems - 🔄 Presets not saving - 📉 App appears abandoned - ⚠️ Unusable due to bugs - 🎛️ GUI cut off on some devices - 🔊 Notes are off-key **Commonly reported bugs** - App crashes when loading saved presets - App crashes when setting default sound - AUv3 option disappears in GarageBand - Inability to reload user patches without crashing - Inability to purchase certain IAP packs - Cells don't save, revert to first synth - App doesn't function or open in GarageBand - Every note is 1 note or lower - GUI is cut off on iPhone SE - IAA not loading in FL mobile **Most requested features** - Fix in-app purchase issues - Improve GarageBand AUv3 stability - Enable saving of custom presets - Address crashing when loading presets - Fix note pitch issues - Ensure app is not abandonware - Improve UI scaling on smaller screens - Fix wavetable scrolling issues - Make IAA work properly - Allow recording of music ## Newest reviews (15 of 45) ### 2/5 — Problème *2026-06-29* Je n’entends plus les sons sur mon iPhone 11 alors que les notes et vu metres se déclenchent bien et j’ai bien du son sur mes autres synthé. ### 4/5 — SynthMaster one for iPhone *2025-02-04* I would give it 5 but I can’t buy in app purchases… I so wanted demis hellen presets ### 4/5 — One fix and it’s good *2024-02-18* I love all what this app includes but whenever I leave GarageBand all my cells don’t save and revert back to the first synth. Would be a five star if this didn’t happen. Any way of fixing this? ### 3/5 — Kind of disappointed *2023-01-28* This is one that gets a lot of praise online. Now granted I do have the free version with no IAP, and the presets are nice, but it crashes on me constantly as an auv3 in GarageBand. ### 2/5 — No Tempo setting / change? *2022-10-21* It’s so great sounding but I can’t find settings for Tempo (Arpeggiator) or Ableton Link … this essetial things really missing??? ### 4/5 — Yo *2022-10-03* Good app but, it keeps crashing because online of presets ### 4/5 — Issues with Inter-app Audio *2021-11-21* Recently, I haven’t been able to load it on GarageBand using the Inter-app Audio option. Please, fix it!! ### 2/5 — Beware - this app is now abandonware *2021-07-12* This app is now clearly abandonware. Emails to the developers about bug tickets raised in the app do not get a response or even an acknowledgment (a couple of examples of bugs: *showstopper* the inability to reload user patches - in standalone or AUv3 - without the app crashing immediately; the inability to purchase certain IAP packs). It is clear that all of their attention is now with the iPad-only Synthmaster2 port from desktop so Synthmaster1 for iPhone is obviously now abandonware. Shame 😔 It was brilliant while it worked. ### 2/5 — Unusable *2021-07-06* Every time I open this app, every note is 1 note or something lower, which makes it unusable. ### 5/5 — Sounds amazing *2021-03-04* And works as audio unit in Cubasis, with writable automation on the filters. Awesome. ### 3/5 — Would be awsome *2021-01-02* There’s a lot of bugs that still need to get fixed for iOS ### 3/5 — iPhone版での不具合？仕様？ *2020-10-18* iPhone版では、Osc Page に Tone Knob が無いので、Waveshaping Algorithm の Tone Parameter を変更出来ない（使えない）？ ### 5/5 — Very well designed! *2020-09-21* Nice touches, e.g., easily zoom in to the arpeggio sequencer, or make the piano keys fill the whole screen while playing. Thanks! ### 5/5 — a go to sound machine *2020-08-23* ease of use a big draw If you are not a patch builder, there are multiple xlnt sounds to choose from with some good mod abilities to shape them as needed. choose your sound and go! ### 5/5 — PHENOMENAL *2020-08-07* OUTSTANDING sounds & ease of use! ## Most critical reviews (10 lowest-rated) ### 1/5 — Plays no sound *2026-06-19* Plays no sound when I open it and use it ### 1/5 — straight up doesn’t work *2025-01-09* the app itself works but whenever i try to use it in GarageBand it straight up doesn’t function at all nor does it open. please fix this ### 1/5 — Sick of this app 👎 *2023-02-12, version 1.5.11* Sick of this app because I’ve bought all the IAP and spend money on this app, and every other week it disappears as AUV3 option for GarageBand iOS, iPhone XR. One week it will show up as an option to use as an AUV3 , next day I’ll wake up and I won’t be able to use the app as AUV3 in GarageBand. SICK OF THIS EVERYTIME I WANT TO MAKE MUSIC HAVE TO WORRY ABOUT IF THIS APP IS GONNA DO ITS JOB OR NOT AND ESPECIALLY AFTER I PAID FOR IT!! FIX THIS YOU LAZY DEVELOPERS , and when this one disappears as an option for AUV3 the other synthmaster app shows up as an option instead, BUT I DONT WANT TO USE THAT OKE BECUASE I DIDNT BUY THE IAP THERE, I guess that’s why you keep taking the other away so I will spend money on another app. 👎👎👎 SAVE YOUR MONEY! ### 1/5 — Amazing Synth but buggy. *2022-07-17* Link to the synth’s manual is down, and IAA connection is broken. Too bad since it’s the best iOS synth there is. ### 1/5 — 八岐大蛇 *2021-11-11* 当方PCよりバージョンアップに備えて2.9万全待機しております。その最中こちらのアプリに関しては立ち上がるも鍵盤を押すと落ちる致命的な不具合がございます。当方iPhone8使用近日中に買い換える予定ですがまたiPhoneとなるでしょう。早急の対応をお願い申し上げます。 ### 1/5 — IPhone 11 Pro *2020-04-20* ich Störgeräusche kann bestätigen ### 1/5 — Schrott *2020-04-05* Schlechteste Synthesizer App, da gibt es kaum noch was zu verschlechtern... ### 1/5 — Die Tonleitern jetz geht garnicht!!! *2020-03-24* Ich versuche mir das bei zu bringen, vorher war es noch zu verstehen , aber was ist das denn jetzt ??? Ich steige da nicht mehr durch . Vorher war es ok .. ### 1/5 — Nicht kaufen *2020-03-04* Nicht kaufen wenn man es nur auf dem iPhone spielen will. Auf iPhone 11 Pro installiert und alle paar Sekunden ein Störgeräusch. Bitte Fehler beheben. Update: Sehr geehrte Entwickler nicht vergessen ich bin Kunde/Käufer und es sollen alle Käufer wissen das es ein Bug gibt. Auch Sie!!!! Dafür sind Rezensionen da. **Developer response:** Why don't you try submitting a bug report at https://www.synthmaster.com/contactus.aspx ? Writing a review like this with a 1/5 rating doesn't help us resolve this bug. Thanks! ### 1/5 — Crashes *2020-02-25* Crashes every time I try to load a preset I created. Makes the app pretty useless as a sound design tool. Have tried saving the preset in various folders, loading it in different ways - nothing works. Would really like a refund if this is not fixed. Would be great otherwise. **Developer response:** Why don't you try submitting a bug report at https://www.synthmaster.com/contactus.aspx ? Writing a review like this with a 1/5 rating doesn't help us resolve this bug. Thanks! ## Most praised reviews (10 highest-rated) ### 5/5 — Consumers are dumb *2025-11-11* Just here to balance the rating because I hate unfair 1-star reviews ### 5/5 — SUNTHESIS HEAVEN!! *2024-12-10* Used a little on a few tracks. The synth arpeggio sounds I’ve designed sound excellent, using LFO’s, filters, cut-off etc sound quality. For a free app im happy. It adds more sounds, alternatives, dimension to an already extensive sound library I have but the sounds I’m using sound a lot better than many synths I’ve used, Using on my iPhone furniture now so the trick is to probably use it sparingly on a song, maximum 2 tracks for me otherwise many synths I’ve apps end up crashing especially if their are lots controller changes in a song. Which usually my synth tracks are working overtime constantly changing loads of sound parameters movement, character, warmth, depth etc. Synthesis heaven! Definitely worth a download even if you use it on only one track as the sound quality is excellent for a free plugin ### 5/5 — Floored *2024-12-06* Unbelievable. I cannot believe how many features are on this for FREE. Thunderous low end and pitch range, million different microtonal keys to choose, incredible range of features and thing to tweak around with. I’ve made some mean sounding drones already and I’ve only been playing around with it for less than 20 minutes. Very impressed. If you’re reading these reviews and you’re skeptical, this will blow you away. ### 5/5 — Great and very powerful *2023-11-14* I like it very much - it has so much to offer!! ### 5/5 — Uh *2023-10-22* If you believe in anything make it this, ### 5/5 — Cool app *2023-06-25* Nice work ### 5/5 — Magnifique le son *2022-11-08* Franchement là c’est vraiment réussi, ça sonne, j’adore ça ### 5/5 — よい *2022-08-12* Garagebandと併せて使う分にはすごくよいです ### 5/5 — Excellent *2021-10-14* Formidable application, de nombreux réglages, des sons excellents. Bravo et merci aux concepteurs :) ### 5/5 — Great sounds *2021-04-17* Options are impressive. MIDI capable? --- *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 2026-08-21.*