JAX Stereo Tool (AU) vs Spatializer
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
Spatializer
Enhance audio with stereo widening that preserves mono compatibility and avoids phase issues. This tool synthesizes side channel information, ideal for mono sources or adding depth to existing stereo tracks without compromising the mid channel.
- Stereo widening without phase smearing
- Synthesizes side channel information
- Preserves mid channel integrity
- Flexible for mono and stereo sources
- Transparent or strong effect options
- Multiband transient shapers
- Directional RMS distribution visualization
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Spatializer is a great choice if you want to widen your sounds but need to avoid: • phase smearing in the mono mix • phasing / comb filter effects (from asymmetric channel delays) • or any changes to the mid channel or mono mix The plugin's main focus is to enhance sounds that have little or no side channel information, where traditional widening approaches like mid-side processing can't be effectively used. It also offers more flexibility in case of mixed inputs, widening narrow components without boosting already existing stereo width to extreme levels that would drown out the mid channel, leading to stereo image problems. Spatializer can also be combined with other effects, for example it's excellent for augmenting large-scale reverbs by enhancing the more immediate space or effectively moving the listener closer to the virtual sound source. At large timescales, the plugin takes on some of the qualities of a reverb itself, while keeping the mid channel sharp and free of any reflections. This could either be used as a special effect in and of itself (depending on the transient characteristics of the input), or be blended together with traditional ambience or acoustic space simulation effects. FEATURES: • Synthesis of side channel information where there was none (stereoization of mono sources) • Linear phase mid channel • Capability to deliver both a neutral / transparent response as well as stronger effects • Built-in multiband transient shapers for delivering a more focused response by suppressing outlier reflections • Multiple visualization options: Directional RMS distribution, position and motion • Effects can range from close-proximity / spatial audio effects to larger acoustic space reflections • Baseline frequency response is optimized to maximize flatness, balancing the spectral density of Left, Right, Side channels The built-in selection of subtly tuned presets and the combined psychoacoustic properties of the above features give more leeway to easily experiment with kinds of source material that have traditionally presented difficulties, like tracks with prominent LF content. Due to its ability to provide transparent, subtle and high-clarity responses, as well as good spectral density characteristics, Spatializer can also be included in master bus effects chains. In multi-track setups it can be used in parallel with other positioning methods to bring more variation to the sound stage or to provide additional ways to adjust the mix. For audio demos, visit: www.quantovox.com/sp PLEASE NOTE: • AUv3-compatible host application required • Supported sampling rates: 22.05, 44.1, 48, 96 kHz.
Screenshots
Verdict
The clearest difference is rating: Spatializer at 4.8 against JAX Stereo Tool (AU)'s 4.4. Spatializer also leads on review sentiment (91% vs 80%). JAX Stereo Tool (AU)'s advantage is update cadence (every 11 days vs every 2 months) and price ($5.99 vs $9.99). 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
JAX Stereo Tool (AU) costs $5.99 and Spatializer $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Spatializer holds the better App Store score, 4.8 against 4.4. Both are backed by a comparable volume of ratings — 27 and 27 respectively. Written reviews point the same way: 80% of JAX Stereo Tool (AU)'s written reviews are positive against 91% of Spatializer's.
JAX Stereo Tool (AU) ships an update every 11 days, Spatializer every 2 months. The most recent releases landed on September 23, 2026 and September 15, 2026 respectively.
| Parameter | JAX Stereo Tool (AU) | Spatializer |
|---|---|---|
| Price | $5.99 — better | $9.99 |
| Rating | 4.4 (27 ratings) | 4.8 (27 ratings) — better |
| Positive reviews | 80.0% of reviews | 90.9% of reviews — better |
| Number of ratings | 27 | 27 |
| Update frequency | Every 11 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 12.1 |
| Further details — not scored | ||
| Size | 10 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Jens Guell | quantovox |
Customer experience
JAX Stereo Tool (AU)
Spatializer
In-app purchases
JAX Stereo Tool (AU)
No in-app purchases
Spatializer
No in-app purchases
Questions
Is JAX Stereo Tool (AU) free?
Is Spatializer free?
Which has better reviews, JAX Stereo Tool (AU) or Spatializer?
Do JAX Stereo Tool (AU) or Spatializer have ads?
Which is updated more often, JAX Stereo Tool (AU) or Spatializer?
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