Comparison

JAX Stereo Tool (AU) vs NuRack Auv3 FX Processor

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

Head to head
About

JAX Stereo Tool (AU)

This audio processing tool allows users to visually manipulate the stereo image of digital audio. It functions as a mastering effect, enabling real-time adjustment of stereo width and the recovery of mono compatibility. The app includes a correlograph for visual feedback and optimization.

Highlights
  • Visual stereo image manipulation
  • Real-time stereo width adjustment
  • Mono compatibility recovery
  • Integrated correlograph for visual feedback
  • Audio Unit (AUv3) plugin format
  • System-wide availability
Features
Read full description

JAX Stereo Tool is a visual Audio Unit plugin for manipulating the stereo image of digital audio. The distribution app comes with an embedded plug-in (Audio Unit) that is available system-wide when you install the app. You should be able to use it with most supporting host applications. Audio Units are Apple's recommended method for providing shared audio effects for applications and audio editors. You can load the plugin into any host application that supports at least stereophonic audio effect plug-ins (in Audio Unit format - AUv3) with its own user interface. JAX Stereo Tool has its main use as a mastering effect, that allows you to modify the stereo image of your audio by narrowing or widening it in a controlled manner. That is, the stereo output can be continuously adjusted in the basic function of pure mono to very wide stereo. This happens in real time and you can observe the result with the integrated correlograph, controlling and optimizing the audio thanks to this helpful additional visual information. One of the special functions of JAX Stereo Toolis to recover lost mono-compatibility. This technique is conceptually quite simple and effective but somewhat difficult to understand. Please read the manual for further details. The manual is shipped with the app or available on the product website at https://audio.digitster.com

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.

Screenshots

JAX Stereo Tool (AU)4 screens
NuRack Auv3 FX Processor4 screens

Verdict

The call

The clearest difference is price: JAX Stereo Tool (AU) at $5.99 against NuRack Auv3 FX Processor's $12.99. NuRack Auv3 FX Processor's advantage is rating (4.7 vs 4.4) and chart position (#182 vs unranked). On review sentiment, ratings volume, update cadence and ads 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

JAX Stereo Tool (AU) costs $5.99 and NuRack Auv3 FX Processor $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

NuRack Auv3 FX Processor holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 27 and 42 respectively. Written reviews point the same way: 80% of JAX Stereo Tool (AU)'s written reviews are positive against 84% of NuRack Auv3 FX Processor's.

UpkeepUpdate frequency

JAX Stereo Tool (AU) ships an update every 11 days, NuRack Auv3 FX Processor every 3 weeks. The most recent releases landed on September 23, 2026 and September 25, 2026 respectively.

Scorecard3 real differences · 8 level
JAX Stereo Tool (AU) versus NuRack Auv3 FX Processor: the parameters behind the verdict, then further details
ParameterJAX Stereo Tool (AU)NuRack Auv3 FX Processor
Price$5.99 — better$12.99
Rating4.4 (27 ratings)4.7 (42 ratings) — better
Positive reviews80.0% of reviews84.4% of reviews — better
Number of ratings2742 — better
Update frequencyEvery 11 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank—#182 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13
Further details — not scored
Size10 MB26 MB
Age rating4+4+
DeveloperJens Guell4Pockets.com

Customer experience

JAX Stereo Tool (AU)

All ratings27 ratings
Positive85.2%
Neutral0.0%
Negative14.8%
Written reviews10 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

NuRack Auv3 FX Processor

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

In-app purchases

None

JAX Stereo Tool (AU)

No in-app purchases

None

NuRack Auv3 FX Processor

No in-app purchases

Questions

Is JAX Stereo Tool (AU) free?
JAX Stereo Tool (AU) costs $5.99, with no in-app purchases.
Is NuRack Auv3 FX Processor free?
NuRack Auv3 FX Processor costs $12.99, with no in-app purchases.
Which has better reviews, JAX Stereo Tool (AU) or NuRack Auv3 FX Processor?
NuRack Auv3 FX Processor is rated higher. JAX Stereo Tool (AU) averages 4.4 out of 5 from 27 ratings, while NuRack Auv3 FX Processor averages 4.7 from 42 ratings.
Do JAX Stereo Tool (AU) or NuRack Auv3 FX Processor have ads?
Neither JAX Stereo Tool (AU) nor NuRack Auv3 FX Processor shows ads.
Which is updated more often, JAX Stereo Tool (AU) or NuRack Auv3 FX Processor?
JAX Stereo Tool (AU) ships an update every 11 days, and NuRack Auv3 FX Processor every 3 weeks. Most recently, JAX Stereo Tool (AU) was updated on September 23, 2026 and NuRack Auv3 FX Processor on September 25, 2026.

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