# Kauldron Synthesizer — user reviews > 74 indexed App Store user reviews of Kauldron Synthesizer by Yonac Inc., rated 4.60/5 from 136 ratings. - Source: https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609/reviews - App overview in markdown: https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609.md - Rating breakdown: 5★ 113 · 4★ 7 · 3★ 9 · 2★ 3 · 1★ 4 ## What do users think of Kauldron Synthesizer? Overall sentiment: positive **Pros** - ✨ Warm and rich sound - 👍 Easy to use interface - 💡 Great presets included - 🚀 Powerful sound engine - 🌟 High quality emulation - 🎶 Versatile sound capabilities - 📱 AUv3 compatible - 🔊 Massive sound - 🎹 Good arpeggiator - 🔥 Spawn system for variations - 💰 Great value for price - 💻 Intuitive controls - 👌 High quality development **Cons** - 🐛 Buggy AUv3 implementation - 🔊 Shrill noise issue - 🔇 No Bluetooth speaker support - ⚠️ Strange behavior/no reset - 📉 Lacks oomph/personality - 🐌 Slow on older iPads - 🔌 Fails with iConnectivity interface **Commonly reported bugs** - Oscillators cannot be set to -1 octave - Shrill noise - No Bluetooth speaker output - Fails to reload with Logic projects - Cannot load into Logic Pro - Starts and quits on latest iOS - AUv3 bug: receives notes regardless of track selection - AUv3 implementation flaky, random crashes - AUv3: plays all instances simultaneously - Bug with Garageband: duplicates patterns - MIDI learn functions not saved - Sometimes glitchy - XY pad movements not recorded as automation - CPU killer on iPad 4 - No function to share sounds **Most requested features** - Bring synths/effects to macOS - Mac App version - More comprehensive FX section (distortion/saturation) - MIDI-out for arpeggiator - Drum machine, PAD launcher, DAW - Browser download feature - Sequencer in Kauldron - Effects tool - Version history - More developer responses/support - Dark mode option ## Newest reviews (12 of 74) ### 5/5 — Indispensable *2020-02-08* An excellent 3 OSC synth with plenty of character and the SPAWN system is great for coming up with variations or completely random sounds. Would love a more comprehensive FX section, the included FX are good but the app is in need of some distortion or saturation (we get some very nice overdrive in the filter section however) - I’ve managed to recreate some of my favourite old sounds already - can’t wait for more. Good stuff! ### 5/5 — Powerful, stable and rich. *2019-12-28* Kauldron is an incredible synthesizer! Three OSCs, an arpeggiator, extensive effects and modulation capabilities... look, it’s $10. Buy it. ### 5/5 — Poly Aftertouch Dream *2019-09-27* An amazing app from very a talented developer. Works fantastic with my Kurzweil MIDIBoard. The sounds are all very distinctive in an interface that is at once intuitive and powerful. ### 5/5 — So far so good on iOS 10 *2019-08-13, version 1.0* Will this work with iOS 12 ??? ### 5/5 — Realistic Analog Sound *2019-07-01* This synth has a very expensive sound quality, one of the best on the appstore. Just amazing! ### 4/5 — Unbrauchbar mit Bluetooth *2019-05-31* Habe Kauldron und Magellan aus diesem Hause erworben. Kauldron erzeugt Sounds mit störenden Geräuschen und Magellan gar keine Sounds, sondern nur Kratzgeräusche beim hören über Bluetooth-Kopfhörer, dies passiert nicht mit Synth anderer Anbieter auf einem iPad Pro 3. Generation, iOS 12.3.1. Da Kauldron über IAA Host auch mit Bluetooth funktioniert, Magellan habe ich noch nicht getestet, die Sounds beider Synths bisher einen guten Eindruck hinterlassen haben, vergebe ich statt einen, vorläufig vier Sterne für beide Synth. ### 5/5 — Yes!!! *2019-05-11, version 1.0* Guitars, organs, Kauldron, and magical connotations. Tobacco is good company to keep! ### 5/5 — 5ive ⭐️ *2019-03-18* The title says it all...this synth is fantastic and comes loaded with lots of room to maneuver...way to go Yonac and freinds! ### 3/5 — Needs updating *2018-12-23, version 1.0* Midi learn functions not saved. Am I missing something? Sometimes glitchy ### 4/5 — Great little synth *2018-11-28* Sounds nice, controls laid out well... but above all for me it runs like a dream as an a AU plug in in Cubasis. Low cpu hit, GUI is easy to access. Thank goodness Yonac showed how it should work! I haven’t been able to record the movements of the XY pads as automation in Cubasis yet ... not sure if it’s not supported within Kauldron, or if something else is in play. But if you are trying to go all AU and get rid of all the IAA / routing headaches then try this. Let me play around a bit mote and see if the extra star is forthcoming! ### 5/5 — Omg cyber Monday *2018-11-26* Whaaat? $$ insane cyber Monday deals! The Yonac synthesizers sound incredible! Magellan, Kauldron and Kaspar are iOS must-have synths. Just paid eight bucks for all three sonic powerhouses. Ableton Link provides sync for controlled analogue mayhem. Thank you Yonac 🎧🎹🔥🔥 ### 5/5 — It’s already really good app though. *2018-11-21* If it’s possible, I’d like midi-out to control other apps by the arpeggiator in this app. ## Most critical reviews (10 lowest-rated) ### 1/5 — No Bluetooth Speaker *2024-05-30, version 1.1* All my other synths on my iPad come out my IK iLoud speakers via Bluetooth .. this one doesn’t :( ### 1/5 — Not working on latest iOS *2020-11-26* Starts and quits **Developer response:** Hi! Please delete and reinstall the app on your device. Thanks! - The Yonac Team ### 1/5 — Strange behavior, no tech support *2018-12-30, version 1.0* I adjusted the filter, including the adsr to something approximating a brass sound, with Osc 2 and 3 off. Then I applied some glide and suddenly the sounds became low volume beeps and there was no way to recover, no reset to default seems to exist, couldn’t find it in the manual either. Exit the app,leave it alone for 24 hr, and it seems fine, glide works the way it should. After reading the manual, which is more of a list than explanation, I got more ambitious and added the other Oscs, fooled around with the second set of adsr and drift and voices, things seemed to work, although the second adsr set is a bit weird. I had written to Yonac about Kauldron a week before, got no form reply nor tech support. I think I could rate this app four if I thought there was any support. I haven’t tried presets yet but I think I will have to, because the app certainly doesn’t load with your last settings, in fact some knobs are not where you would think they would be and others have stayed where they were. Default behavior and reset are not in the manual, nor is there a a good discussion of all adsr behavior. The filter settings don’t have any meaningful indices that I can see, you don’t know where the resonance is, and there is only one (steep) roll off so you really can’t do brass effectively. EDIT: I have again used the Yonac website contact form and received no acknowledgement or response, so I have to conclude that there is NO tech support, so I have reduced my rating to one star, because you can’t do no stars. Second EDIT: I actually got a response after two days, to my 3rd email, but the tech seems not to have read the manual. I have replied but don’t have much hope for a real answer. Third Edit: I have written to Yonac at least four times, and received one reply mentioned above, so I really can’t understand all the rave reviews, the ADSR is goofy and uncalibratable, for instance if you set what you would think is a very short attack and set what Yonac says is a high amplitude, it takes seconds for a tone to reach peak. This is ridiculous. Fourth edit: There is no version history, there is no tech support, I have to believe this app has been abandoned. You can not get into the Yonac forum on iOS, but I have posted from my Mac and there have been a few views but no response, so I have to think that it didn’t sell, and that some of the problems I have described have been experienced by other who also got no response and deleted the app. I am not ready to give up on it, but I am absolutely you can not synth brass adequately, because the adsr is crazy, the cutoff is way too steep, and you can’t place the resonance with any certainty. There does not seem to be a brass instrument in any of the many presets , which would seem to make my point. I notice there are only a few developer responses in the reviews and they are all canned. ### 1/5 — Fail, if you use a iconnectivy interface *2018-04-05, version 1.0* I have a lot of synth apps, and they all work with iconnectivity....except this one. So it’s worthless to me. If they convince me it does work, then prove it and I’ll change my rating. ### 2/5 — Bug Key continue 2025 !!! *2024-12-26* SHRILL NOISE!!! ### 2/5 — Still no fix for the AUv3 bug *2019-04-26* Kauldron is a great standalone iOS synth. Unfortunately, it’s effectively useless as a plugin due to a bug that I reported over a year ago. When loaded as an AUv3 (I’ve tried it in BeatMaker 3, GarageBand, NanoStudio 2) with a MIDI keyboard connected over Lightning, Kauldron doesn’t conform to the standard behavior of only receiving MIDI notes when its track is selected. Instead, it receives notes regardless of the current track. So if you record a bass line with Kauldron and then try to record a lead with Zeeon, Model 15, or any other AUv3, your lead also triggers notes on Kauldron. As I said above, I reported this bug over a year ago, and never received a response. It’s disappointing because Kauldron sounds great! I’d love to use it in my iOS production, but I can’t with this workflow-breaking bug. **Developer response:** Hello! If you visit our support page on our website, we can help you troubleshoot your issues. It's http://www.yonac.com/support Cheers! - The Yonac Team ### 2/5 — Bug with Garageband *2019-01-08, version 1.0* Wonderful synth but there is a bug working as AU in Garageband... Kauldron duplicate all patterns on my iPad Pro 1st gen! ### 2/5 — Both Magellan And Kaspar are better *2018-02-04, version 1.0* Overhyped... Uninstalled. I own every Yonac app and IAP... You can skip this one unless you like the idea of the Yonac sound sans what it’s other synths bring to the table but.with AU thrown in (even the Randomizer on this one isn’t as good as the one on Magellan... or maybe it’s just that it has less to work with). ### 3/5 — Won’t load into Logic Pro *2023-09-05* It’s been working and all the sudden today it says it can’t load into Logic Pro and to contact the manufacturer. ### 3/5 — Modulation *2020-09-19, version 1.0* How do you define Mod control 1-4 in the modulation matrix? ## Most praised reviews (10 highest-rated) ### 5/5 — Long time Synth *2026-04-30* Habe ihn schon lange und jetzt mal wieder hervorgeholt. Ein toller Synth mit vielen Presets die geilen Pads und voll AuV3 kompatibel. 👍 ### 5/5 — Great sounding synth! *2025-12-22, version 2.0* Please bring all your synths and effects to macOS! ### 5/5 — Xmas update bug *2025-12-22* There’s a bug preventing oscillators from being set at -1 octave. Apart from that an awesome update to one of my favourite synths on iOS. ### 5/5 — Mac App Please? *2025-05-05, version 1.1* Love it. Would love to use it on Mac as well! ### 5/5 — Warmth beyond words! *2025-01-18, version 1.1* It’s no joke and no exaggeration to say that this synth has an unusually warm sound and feel to it. It’s almost odd how good this synth sounds, even on the simplest patches. Yet, this is not just a typical Moog copy. It definitely has its own feel and character and if you spend some time with it, you’ll be amazed at how well it fits into a mix. Thanks. ### 5/5 — I can’t just get it, why am I reviewing this so late *2024-08-02* Yonac, is the leviathan reincarnation of Moog, This is the time, where the new bloodline Will rule the world! Goodbye old friend, you’ve been an amazing friend, but Yonac is us! ### 5/5 — Bug in Logic *2023-09-14, version 1.1* In Logic it fails to reload with projects. It’s the only plug-in with this problem. I love this synth so I hope the issue is resolved soon. ### 5/5 — Quality vintage emulation *2022-04-30* Great emulation of vintage polysynth . Great midi remote control of many parameters. Super smooth on an iphone 5s. Been on the hunt for something to hook up to an old evolution 49midi keyboard with knobs and faders to take along to jam nights , without risking damaging more bulky and expensive hardware. Super pleased. Sounds fantastic with 2 , let alone 3 detunable oscillators .Add in some modulations and fx and yes bingo ! Bravo yonac 👍 ### 5/5 — One of my top favs *2021-09-24* Though it looks like a simple synth at first glance, it can deliver a good range of sounds. I wouldn’t say it’s my fav synth as it’s hard to judge, but it’s definitely in a group of my faves. Efficient, has a character, easy/pleasant to use, good sound quality, good presets management (can create banks and rearrange slot-based patches). Has AUv3. Another excellent synth from these guys is Magellan 2, both are must-have, imho. Very pleasant to use, feels like hardware. ### 5/5 — Great Presets *2020-12-16, version 1.0* I love the presets and the filter pads are easy to use! --- *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.*