JAX Stereo Tool (AU) vs QuadroSphere
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
QuadroSphere
This audio plugin allows musicians to sculpt immersive soundscapes by controlling stereo placement and effects across four distinct frequency bands. Create dynamic, atmospheric audio with automated movement and morphing between saved settings.
- 4 configurable frequency bands
- Control stereo separation, level, and pan per band
- Create and morph between 12 snapshots
- Modulation control for automated sweeps
- Per-band effects (Haas, Delay, Reverb, Chorus, Compressor)
- Convert mono to pseudo-stereo
- MIDI CC control
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QuadroSphere is a great tool for bringing an instrument to life by creating a soundscape with a constantly moving sound source. QuadroSphere splits the incoming audio signal into 4 distinct coloured frequency bands using the frequency bar. Each band has an associated coloured sphere allowing you to control the pan, stereo separation and volume level. You can use this plugin as a way to impose subtle control over stereo placement with little or no movement, or go crazy with random automation. Adding effects such as reverb or delay on a specific frequency band can help create a lush atmospheric swirling which surrounds the listener. This is great for musicians trying to create minimalistic ambient or tranquil soundscapes. You can create up to 12 snapshots of the sphere parameters and effect settings, then morph between them at a designated speed (measured in beats). You can also enable continuous randomization mode, and have full control over which spheres and control which parts are automated. You can also use QuadroSphere as a stereo splitter, using the additional outputs to add your own effects to band outputs. Key Features: ○ 4 Configurable frequency bands. ○ Control stereo separation, level and pan for each band. ○ Create up to 12 Snapshots. ○ Morph between various panning, width and frequency band levels. ○ Modulation control for automated sweeps around pan center. ○ Convert MONO signals into a pseudo-stereo image. ○ Per band Haas, Delay, Reverb, Chorus and Compressor. ○ Allows combined and individual per-band audio outputs. ○ Continuous randomized morphing of the stereo field. ○ Built in Preset Manager with drag and drop support. ○ Power and Solo for each band. ○ Controlable morph speeds. ○ Various animated transition modes. ○ Access most options using AU parameters or MIDI CC control.
Screenshots
Verdict
The clearest difference is rating: QuadroSphere at 5.0 against JAX Stereo Tool (AU)'s 4.4. QuadroSphere also leads on review sentiment (100% vs 80%). JAX Stereo Tool (AU)'s advantage is price ($5.99 vs $7.99). On ratings volume, update cadence, ads and in-app purchases 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
JAX Stereo Tool (AU) costs $5.99 and QuadroSphere $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.
QuadroSphere holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 27 and 10 respectively. Written reviews point the same way: 80% of JAX Stereo Tool (AU)'s written reviews are positive against 100% of QuadroSphere's.
JAX Stereo Tool (AU) ships an update every 11 days, QuadroSphere every 3 weeks. The most recent releases landed on September 23, 2026 and September 25, 2026 respectively.
| Parameter | JAX Stereo Tool (AU) | QuadroSphere |
|---|---|---|
| Price | $5.99 — better | $7.99 |
| Rating | 4.4 (27 ratings) | 5.0 (10 ratings) — better |
| Positive reviews | 80.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 27 — better | 10 |
| Update frequency | Every 11 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 10 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Jens Guell | 4Pockets.com |
Customer experience
JAX Stereo Tool (AU)
QuadroSphere
In-app purchases
JAX Stereo Tool (AU)
No in-app purchases
QuadroSphere
No in-app purchases
Questions
Is JAX Stereo Tool (AU) free?
Is QuadroSphere free?
Which has better reviews, JAX Stereo Tool (AU) or QuadroSphere?
Do JAX Stereo Tool (AU) or QuadroSphere have ads?
Which is updated more often, JAX Stereo Tool (AU) or QuadroSphere?
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