Comparison

KORG iM1 vs NERD Synth A2x + AUv3

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

KORG iM1

This app faithfully reproduces the legendary M1 synthesizer, offering its iconic sounds and expanded features for modern music creation. It provides a vast library of presets and intuitive performance tools, making it accessible to both experienced musicians and beginners.

Highlights
  • Faithful reproduction of original M1 sound
  • Expanded filter resonance and 18 effects
  • Gigantic library of 3,300 sounds
  • Intuitive KAOSS pad for performance
  • Smart Sound Browser for quick sound selection
  • Compatible with KORG Gadget
Features
Currently charting
Read full description

A complete reproduction - and more - of the legendary M1 that defined an era. Mobile Digital Synthesizer for the iPad. ● Selected by Apple as "App Store Best of 2015" ● Ranked #1 on the App Store on Top Paid Music category in more than 20 countries! (15/5/27) Since it went on sale in 1988 the legendary M1 music workstation rapidly achieved record-breaking sales, becoming a mainstay of the music scene from the late 1980s and beyond. The common element of electronic instruments that have left their name in history is that they had a unique sound that was difficult if not impossible to replicate. Sounds such as the “M1 Piano” is instantly recognizable and have appeared on countless hit records over many years, and yet these are sounds that could only be produced by the M1. And that’s what you can now have on your iPad! ● A faithful reproduction of the original M1 Sound The PCM data provides the library of the original M1. For the hardware, we analyzed the circuit diagram of the original design, and completely replicated it in software down to the last detailed parameters. Engineers with an exhaustive knowledge of the M1 made careful adjustments in order to obtain the sound of the original unit, something that cannot be obtained simply by sampling the original sounds. ● A continued evolution of the M1 Not content with simply reproducing the original, iM1 provides further evolutionary developments. Synth parts now have the Filter Resonance that was requested at the time of the original. The effect parts, originally consisting of only two effects, have been powered-up to 18 effects. The user interface has also been refreshed with additions such as a KAOSS pad. iM1 is the ultimate version of the KORG M1. ● A gigantic library encompassing 3,300 sounds and 34 cards* In addition to all 19 of the ROM cards originally released for the M1, iM1 also covers the sounds of the M1EX which expanded the internal PCM of the M1, as well as the sounds of the T-series which appeared as an evolution of the M1. There’s also “BEST OF M1”, a selection of 100 great M1 programs. The new “Smart Sound Browser” makes it quick to find the desired sound. You can also view the sounds ranked by how often they are selected by iM1 users around the world. *with all the expansion card installed via in-app purchase ● KAOSS pad lets anybody perform iM1 features a KAOSS pad from the popular KAOSSILATOR, allowing you to perform intuitively just by touching the screen. By using the dual KAOSS pads to play phrases or adjust the sound, even people who are not accustomed to keyboard instruments or knowledgeable about synthesizers can enjoy performing the iM1. There’s also a conventional keyboard, as well as the “Smart Keyboard”, which lets you specify a scale setting and play phrases with a single finger. ● Use with KORG Gadget for song production iM1 can be used together with Gadget, the music production DAW app that won the App Store Best App of 2014 award in Japan. If both apps are installed, you can use iM1 as a sound module within Gadget, taking advantage of the program sounds in iM1 for music production. iM1 also supports Audiobus and Inter-App Audio, so it can also be used for GarageBand etc. ● Connect a MIDI keyboard and use as a sound module In addition to enjoying iM1 on its own, you can connect a USB MIDI keyboard* via a Lightning adaptor and play the iM1 as an external sound module. You can easily take along an even more powerful workstation sound module as part of your iPad-based compact mobile system. *microKEY, nanoKEY etc. ● Interchangeable with the KORG Legacy Collection and the original M1 Sounds that you create in iM1 can be sent from your iPad via iTunes to a Mac/PC. If you have the Legacy Collection M1, you can use those sounds in a DAW. More info at korg.com

About

NERD Synth A2x + AUv3

This virtual analog synthesizer offers a powerful and intuitive sound design experience, inspired by classic hardware. Explore over 40 classic waveforms, a versatile arpeggiator, step sequencer, and lush effects to craft unique electronic music.

Highlights
  • Virtual Analog Synthesizer
  • 40+ Classic Waveforms
  • Arpeggiator
  • Step Sequencer
  • Lush Effects Suite
  • Four-voice Unison
  • AUv3 Plugin Support
Features
Currently charting
Read full description

Inspired by the classic sounds of the Nord Lead A1** This is not a Rompler. This is a SYNTH.  "I’m impressed. The sounds are FAT, the effects are LUSH, and the interface is a JOY to use."  – Audio News Room "This is not a clone, this is BEYOND the hardware, it's a completely new, fantastic beast" – Jade Starr, How to App "An excellent release...app captures the soul of the Nord Lead A1 Synthesizer"  – Synth Anatomy "An iOS-based homage to a virtual analogue classic!" – Music Radar / Keyboard Magazine Not imitation, it's Innovation! https://audiokitpro.com/redsynth With Nerd Synth, you’ll have access to all 40+ of the classic lead A1 waveforms! Plus, we gave it some RAW MODERN POWER. FULLY LOADED w/ 550+ presets by Analog Matthew, Electronisounds, DMT Cymatics, Moby Pixel, Red Sky Lullaby, and more NOTE: This is a synth, and contains no hardware preset samples. All presets are completely original. One low price includes Lifetime License and all Features Easy to use. Easy to get great tone! NERD SYNTH A2X: • 64-voice, Retro VA-Synth • Include all 40+ of the Nord A1 waveforms • Arpeggiator! Classic Hardware-style Arp, with extra features • Vintage-style Step Sequencer that can be routed to specific layers • A proper filter envelope ADSR! • NEW: 2x Oversampled Oscillators • 3 LFOs. Fun Routings. LFOs can modify other LFOs • Microtonality, World Scales and Western Scales! • TouchPads! 2 fun assignable pads, -= Create NORD-style SUPER SAWS =- ++ Four-voice Unison with the tap of a button ++ 3 different algorithms: Regular, HYPER, and BEAST! "Astoundingly great sounding and intuitive synth app!" – The GarageBand Guide Modeled sound: It's like a time-capsule. Imagine if there were iPads in 2003? Complete with that "cold" VA sound that ruled the dance floors and stages ADDITIONAL FEATURES: • FX: Glorious Reverb, Analog Tape Delay, Distortion, Flanger, Chorus, Crush, and more. • On board "Record" button, no external hardware required • Works with a MIDI Keyboard EXCLUSIVE TO THIS APP: • "SUPER FM" wild pitch drop controls! Modeled after digital VA-Synths, complete with vintage digital aliasing for old-school vibe! • Crazy aggressive RING MODULATION distortion – It's like robots talking, or fighting? You decide! COOL: • iPad version has "stacked" views for maximum onscreen control! Tap the current Nav Button at the top to change the bottom view • This is a Premium App: No iAP, No Ads, No subscriptions! Use as a plug-in in DAWs like GarageBand & Logic for iPad, Cubasis, AUM, and more! NOTE: This is not a hardware clone, it's a completely new synth. If you're looking for a ROMpler like the "Stage" series, this app may not be for you. This is a SYNTH, not a rompler. All the presets here are new and original. Giving you fresh new sounds that are completely tweak-able This is not a 1:1 clone and will not load hardware presets. Please note that this app's sound is closer to the A1, which is a different sound from the NL1/NL2X. ** This app has no affiliation or endorsement by Clavia DMI AB. This app is not a clone of any their synths, including the Nord Lead and Nord Lead A1. While we were inspired by their wonderful and iconic work, this app is not trying to copy those synths. We created something completely new. It's a synth for synth nerds :) LEGAL STUFF: All product names and images, trademarks and artists names are the property of their respective owners, which are in no way associated or affiliated with the creators of this app, including AudioKit, AudioKit Pro, LLC, and the other contributors. Any use of these names and images does not imply any cooperation or endorsement by Clavia Digital Musical Instruments. Nord Lead, Nord Lead 2X, Nord, and Nord Lead A1 are Clavia trademarks and properties. We appreciate their amazing work in creating such classic and inspiring instruments.

Screenshots

KORG iM14 screens
NERD Synth A2x + AUv34 screens

Verdict

The call

The clearest difference is price: NERD Synth A2x + AUv3 at $5.99 against KORG iM1's $29.99. NERD Synth A2x + AUv3 also leads on in-app purchases (none vs 2) and update cadence (fortnightly vs every 7 months). KORG iM1's advantage is iOS requirement (12.0 vs 14.4). On ratings volume, ads, chart position and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

KORG iM1 costs $29.99 and NERD Synth A2x + AUv3 $5.99 up front. KORG iM1 sells 2 one-off in-app purchases. NERD Synth A2x + AUv3 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

NERD Synth A2x + AUv3 holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 1K and 1.3K respectively. Written reviews point the same way: 82% of KORG iM1's written reviews are positive against 90% of NERD Synth A2x + AUv3's.

UpkeepUpdate frequency

KORG iM1 ships an update every 7 months, NERD Synth A2x + AUv3 fortnightly. Both last shipped on September 23, 2026.

Scorecard7 real differences · 4 level
KORG iM1 versus NERD Synth A2x + AUv3: the parameters behind the verdict, then further details
ParameterKORG iM1NERD Synth A2x + AUv3
Price$29.99$5.99 — better
Rating4.7 (1K ratings)4.9 (1.3K ratings) — better
Positive reviews81.5% of reviews90.4% of reviews — better
Number of ratings1K1.3K — better
Update frequencyEvery 7 monthsFortnightly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank#126 — better#165
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better14.4
Further details — not scored
Size200 MB242 MB
Age rating4+4+
DeveloperKORG INC.AudioKit Pro

Customer experience

KORG iM1

All ratings1,007 ratings
Positive93.8%
Neutral2.3%
Negative3.9%
Written reviews487 reviews
Positive81.5%
Neutral7.4%
Negative11.1%

NERD Synth A2x + AUv3

All ratings1,342 ratings
Positive99.1%
Neutral0.6%
Negative0.3%
Written reviews146 reviews
Positive90.4%
Neutral6.8%
Negative2.7%

User reviews

KORG iM1

From 1K App Store ratings

What we love

  • 👍 Authentic M1 sound reproduction
  • 💰 Great value for money
  • 🎹 Faithful recreation of the original hardware
  • 🎨 Powerful sound customization options
  • 🔗 Works well with MIDI controllers

Room to improve

  • 🐛 Occasional crashes or stability issues
  • 🔇 Low output volume compared to other apps
  • 🤔 Confusing UI for patch editing and saving
  • 🔴 Missing AUv3 support for integration with DAWs

NERD Synth A2x + AUv3

From 1.3K App Store ratings

What we love

  • ⭐ Outstanding synth
  • 👍 Very nice and rich sounding
  • 🎨 Great presets and sound design
  • 🔧 Easy to use and intuitive
  • 💻 Works well in AUv3 environments

Room to improve

  • 🐛 Doesn't show up in Logic
  • 🔧 Needs to be more Mac-compatible
  • 🔧 Changing presets can be sluggish
  • 🔧 Missing aftertouch/expression support

Bugs and requests

KORG iM1

Reported bugs

3 issues
  • Disappearing or missing purchased sound cards
  • Bluetooth MIDI connectivity issues
  • Compatibility problems with certain iOS versions or devices

Requested features

4 requests
  • Add AUv3 support for better DAW integration
  • Improve preset management and saving capabilities
  • Increase master volume control options
  • Expand sound library with more cards/expansions

NERD Synth A2x + AUv3

Reported bugs

2 issues
  • Doesn't fit properly in Logic Pro for iPad
  • Keyboard keys get stuck when using a controller

Requested features

4 requests
  • Dark mode option
  • Undo/redo functionality
  • Improved Logic Pro integration
  • Ability to change color scheme

In-app purchases

2 purchases

KORG iM1

One-time2
  • M1 Cards Pack$4.99
  • T1 Cards Pack$4.99
None

NERD Synth A2x + AUv3

No in-app purchases

Questions

Is KORG iM1 free?
KORG iM1 costs $29.99, and also offers in-app purchases.
Is NERD Synth A2x + AUv3 free?
NERD Synth A2x + AUv3 costs $5.99, with no in-app purchases.
Which has better reviews, KORG iM1 or NERD Synth A2x + AUv3?
NERD Synth A2x + AUv3 is rated higher. KORG iM1 averages 4.7 out of 5 from 1K ratings, while NERD Synth A2x + AUv3 averages 4.9 from 1.3K ratings.
Do KORG iM1 or NERD Synth A2x + AUv3 have ads?
Neither KORG iM1 nor NERD Synth A2x + AUv3 shows ads.
Which is updated more often, KORG iM1 or NERD Synth A2x + AUv3?
KORG iM1 ships an update every 7 months, and NERD Synth A2x + AUv3 fortnightly. Most recently, KORG iM1 was updated on September 23, 2026 and NERD Synth A2x + AUv3 on September 23, 2026.
Which is more popular, KORG iM1 or NERD Synth A2x + AUv3?
KORG iM1 currently peaks at #126 in the App Store charts, and NERD Synth A2x + AUv3 at #165. Chart position reflects recent download velocity rather than total install base.

Other comparisons