Comparison

NuRack Auv3 FX Processor vs AU3FX

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

Head to head
About

NuRack Auv3 FX Processor

Design custom audio and MIDI effects racks with over 80 building blocks. Route audio in series or parallel and create unique interfaces for your sound processing needs.

Highlights
  • Design custom effects racks
  • Over 80 audio and MIDI building blocks
  • Full routing control (series/parallel)
  • Customizable interface builder
  • Seamless effect switching
  • 3 independent audio racks mode
  • Extensive automation options
Currently charting
Read full description

NuRack is an AUv3 based multi-channel audio and MIDI effects processor with a difference, it actually allows you to design your own custom effects using the 80+ building blocks provided. You have full control over routing which allows you to create complex audio paths in series or parallel. You can choose whether to use the stock interface or create your own custom interface using the built in Interface Builder which allows you to concentrate your audio components into a single customized effect. NuRack can run in one of two modes. The first providing 3 customizable effects racks which can be switched (manually or via MIDI), providing seemless switching (i.e. delay trails linger whilst another set of effects are faded in). The second mode allows you to route audio through 3 independent audio racks. A generaous number of over 80 audio and midi building blocks are provided covering 12 different categories of effects. Here are just some of those included in NuRack: Modulation Effects: Chorus, Flanger, Phaser, Tremolo, Vocal Doubler, TalkBox, UniVibe, Leslie & Vocoder. Time Based Effects: Stereo Delay, Tape Delay, Reverb and Reverse Delay. Spectral Effects: Parametric EQ, Graphic EQ, PitchShift, Auto-Pan, Bit-Crusher, Tube Overdrive, Distortion, Harmony, Harmonic Exciter and SlowMo. Dynamic Effects: VelocityControl, Compressor, Multi-Band Compressor, Noise Gate, Gate, and Limiter. Filter Effects: MultiFilter, LP/HP Filter, Frequency Splitter, MultiBand Splitter, Classic Filters, Formant Filter, Ring Modulation and Shelf Filter. MIDI Effects: MIDI Harmony, MIDI Velocity, MIDI Randomizer, MIDI Monitor, MIDI Mixer, MIDI Pads, MIDI Control, Strummer, MIDI Recorder, MIDI Modulation, MIDI Remap, CC Monitor, CC Generator, PitchBend, MIDI Time Clock, and ChordToMidi. Generator Modules: Noise, Audio Clip Launcher, SoundFont Player, Virtual Flute, Virtual Clarinet, Virtual Brass, FM Organ, FM Rhodes and Analog Sawtooth Synth. Automation: TouchPad, AutoMate, Pattern Automation, and Visual LFO. You also provide the ability to split and combine audio signal using splitters and mixer modules as well as a number of visual elements such as VU Meters, LED Meters, Scopes, Graphs etc. Some effects such as phaser and flanger are usually controlled by an LFO, but this can be detached and automated remotely. There are a number of modules that allow auomation based on direct touch (X/Y Pads), Visual LFO, Pattern Automation, MIDI input (CC data), or peak/rms level detection. These automation modules can remotely control knobs and sliders throughout your rack. Simply create a new rack and start adding modules to it. These modules are generally wired up automatically but these connections can be manually routed. Once you have your sound as you wish you can use it 'as is', or switch to Interface Builder mode where you can combine all your modules into a single interface. Elements can be dragged, dropped, resized and coloured as required. Add your own labels, image logos and custom backgrounds before saving your custom component. Use the X/Y Pad to control your modulation effects by detaching their LFO's. Use MIDI CC data to automate knobs. Use the velocity of an incoming signal to control the cutoff/resonance of a filter (wah) or volume level of a gain control (swell), as NuRack expands, so do the possibilities. Features: ○ Over 80 categorised modules. ○ 3 Input / Output busses supported. ○ Audio & MIDI effect. ○ Lots of audio & MIDI automation options. ○ Seemless transition between racks. ○ Manual audio path routing. ○ Open in presentation mode (auto hides controls). ○ Interface Builder to customize your rack. ○ AUv3 plugin runs in MIDI and none MIDI mode. ○ Add your own Text/Heading and Image/Logos and backgrounds to your design. ○ Compatibility options for DAW's not supporting multi-channels. ○ Dark/Light Modes Checkout the YouTube channel 'Paul the MusicMan' for demos and tutorials of NuRack.

About

AU3FX

This audio effect plugin offers a highly customizable stereo delay, capable of producing a wide spectrum of sounds from clean digital echoes to distorted dub effects and flangers. It features a 32-bit DSP engine with extensive tweakable parameters, tape simulation, and filters for unique sonic textures.

Highlights
  • Highly tweakable stereo delay
  • 32-bit DSP engine
  • Tape simulation (noise and warble)
  • Filters in delay loop
  • Stereo, detune, and ping-pong modes
  • Dual LFO for modulation
  • Bundled presets and user presets
Features
Read full description

A highly tweakable stereo delay AudioUnit effect, suitable for everything from clean digital delays to filthy dub echoes, flangers and broken cassette tapes. This app is part of the AU3FX series, a collection of simple and powerful audio unit effect plugins. • High quality 32-bit DSP engine. • A multitude of parameters to tweak to get a wide range of sounds. • Tape simulation (noise and warble). • Filters in the delay loop for typical dub sound. • Stereo delay, stereo detune, ping-pong delay. • Sinewave and random dual LFO for flangers and other modulations. • Comes with several bundled presets. • Use multiple instances at the same time. • Save/load session state in host. • External access and control of all parameters from host. • User presets shared across hosts (on iOS 13 and later).

Screenshots

NuRack Auv3 FX Processor4 screens
AU3FX2 screens

Verdict

The call

The clearest difference is update cadence: NuRack Auv3 FX Processor at every 3 weeks against AU3FX's every 6 months. NuRack Auv3 FX Processor also leads on chart position (#197 vs unranked). AU3FX's advantage is rating (5.0 vs 4.7) and review sentiment (100% vs 84%). On ratings volume, ads, in-app purchases and monetization model 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

NuRack Auv3 FX Processor costs $7.99 and AU3FX $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

AU3FX holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 42 and 20 respectively. Written reviews point the same way: 84% of NuRack Auv3 FX Processor's written reviews are positive against 100% of AU3FX's.

UpkeepUpdate frequency

NuRack Auv3 FX Processor ships an update every 3 weeks, AU3FX every 6 months. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

Scorecard5 real differences · 6 level
NuRack Auv3 FX Processor versus AU3FX: the parameters behind the verdict, then further details
ParameterNuRack Auv3 FX ProcessorAU3FX
Price$7.99$5.99 — better
Rating4.7 (42 ratings)5.0 (20 ratings) — better
Positive reviews84.4% of reviews100.0% of reviews — better
Number of ratings42 — better20
Update frequencyEvery 3 weeks — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#197 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS1312.0 — better
Further details — not scored
Size26 MB2 MB
Age rating4+4+
Developer4Pockets.comKymatica AB

Customer experience

NuRack Auv3 FX Processor

All ratings42 ratings
Positive92.9%
Neutral2.4%
Negative4.8%
Written reviews32 reviews
Positive84.4%
Neutral6.3%
Negative9.4%

AU3FX

All ratings20 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews11 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

NuRack Auv3 FX Processor

No in-app purchases

None

AU3FX

No in-app purchases

Questions

Is NuRack Auv3 FX Processor free?
NuRack Auv3 FX Processor costs $7.99, with no in-app purchases.
Is AU3FX free?
AU3FX costs $5.99, with no in-app purchases.
Which has better reviews, NuRack Auv3 FX Processor or AU3FX?
AU3FX is rated higher. NuRack Auv3 FX Processor averages 4.7 out of 5 from 42 ratings, while AU3FX averages 5.0 from 20 ratings.
Do NuRack Auv3 FX Processor or AU3FX have ads?
Neither NuRack Auv3 FX Processor nor AU3FX shows ads.
Which is updated more often, NuRack Auv3 FX Processor or AU3FX?
NuRack Auv3 FX Processor ships an update every 3 weeks, and AU3FX every 6 months. Most recently, NuRack Auv3 FX Processor was updated on October 15, 2026 and AU3FX on October 13, 2026.

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