JAX Stereo Tool (AU) vs Composer Lab
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
Composer Lab
Explore harmonic structures, scales, and microtonal tuning systems. This app offers tools for organizing pitch material, crafting custom tunings, and managing rhythmic units for songwriting and composition.
- Harmonic structure exploration
- Custom tuning system creation
- Rhythmic unit management
- Microtonal scale playback
- DAW file export (.scl, .tun)
- Pitch set theory principles
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Set Module: The Set Module enables musicians to explore harmonic structures and scales of all kinds, and discover new ways of organizing pitch material. Built on the principles of pitch set theory, it offers an intuitive interface along with a rich set of practical tools. Features include fixed superset, fixed subset, invariance calculation, interval vector constraints, unfolding, and numeric recombination mode. The module is designed to make working with complex musical ideas easier and more intuitive, and can be used in songwriting, arranging, film scoring, and concert music composition. Tempo Module: The Tempo Module allows users to set a range for rhythmic units and define a tolerance for timing variations. It supports a system where up to six different tempos can be freely switched and converted. Tuning Module: Start at 1/1 and craft your own tuning system with cents or ratios. Map it onto a standard keyboard so you can transpose in 12ET or in precise cent steps. Hear your microtonal scales live, then export .scl and .tun files straight to your DAW—unlocking boundless realms beyond the twelve-tone limit. New Euclid and Orbit modules added! Detailed guide will be updated shortly.
Screenshots
Verdict
The clearest difference is price: JAX Stereo Tool (AU) at $5.99 against Composer Lab's $17.99. JAX Stereo Tool (AU) also leads on ratings volume (27 vs 2) and iOS requirement (12.0 vs 18.2). Composer Lab's advantage is rating (5.0 vs 4.4) and review sentiment (100% vs 80%). On ads, in-app purchases, monetization model 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
JAX Stereo Tool (AU) costs $5.99 and Composer Lab $17.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Composer Lab holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: JAX Stereo Tool (AU) has 27 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 80% of JAX Stereo Tool (AU)'s written reviews are positive against 100% of Composer Lab's.
JAX Stereo Tool (AU) ships an update every 11 days, Composer Lab every 3 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.
| Parameter | JAX Stereo Tool (AU) | Composer Lab |
|---|---|---|
| Price | $5.99 — better | $17.99 |
| Rating | 4.4 (27 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 80.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 27 — better | 2 |
| Update frequency | Every 11 days | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 18.2 |
| Further details — not scored | ||
| Size | 10 MB | 49 MB |
| Age rating | 4+ | 4+ |
| Developer | Jens Guell | 笑一 杨 |
Customer experience
JAX Stereo Tool (AU)
Composer Lab
In-app purchases
JAX Stereo Tool (AU)
No in-app purchases
Composer Lab
No in-app purchases
Questions
Is JAX Stereo Tool (AU) free?
Is Composer Lab free?
Which has better reviews, JAX Stereo Tool (AU) or Composer Lab?
Do JAX Stereo Tool (AU) or Composer Lab have ads?
Which is updated more often, JAX Stereo Tool (AU) or Composer Lab?
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