Comparison

ChordMapMidi vs JAX Stereo Tool (AU)

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

Head to head
About

ChordMapMidi

This app is a MIDI controller for exploring musical chords and progressions in major and minor keys. It sends note information to other synthesizer apps on your device, making it a portable tool for musicians and educators.

Highlights
  • Explore chords and progressions
  • Major and minor keys
  • MIDI controller functionality
  • Sends note information to synth apps
  • Portable music tool
Read full description

ChordMapMidi allows you to explore chords and chord progressions in both major and minor keys, one finger tap at a time. Note: ChordMapMidi is a MIDI controller. It doesn't create sound on its own. It sends note information to synthesizer apps you have on your device. ChordMapMidi is useful for songwriters, MIDI musicians, music educators... especially in places where the only instrument you have is the phone in your pocket. Have fun exploring chords and progressions!

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

Screenshots

ChordMapMidi4 screens
JAX Stereo Tool (AU)4 screens

Verdict

The call

The clearest difference is rating: ChordMapMidi at 5.0 against JAX Stereo Tool (AU)'s 4.4. ChordMapMidi also leads on price ($3.99 vs $5.99). JAX Stereo Tool (AU)'s advantage is update cadence (every 11 days vs every 8 months) and review sentiment (80% vs 53%). On 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

ChordMapMidi costs $3.99 and JAX Stereo Tool (AU) $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

ChordMapMidi 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 5, so its average is the more settled of the two. Written reviews complicate that: 53% of ChordMapMidi's written reviews are positive against 80% of JAX Stereo Tool (AU)'s, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

ChordMapMidi ships an update every 8 months, JAX Stereo Tool (AU) every 11 days. The most recent releases landed on October 9, 2026 and October 12, 2026 respectively.

Scorecard7 real differences · 3 level
ChordMapMidi versus JAX Stereo Tool (AU): the parameters behind the verdict, then further details
ParameterChordMapMidiJAX Stereo Tool (AU)
Price$3.99 — better$5.99
Rating5.0 (5 ratings) — better4.4 (27 ratings)
Positive reviews52.9% of reviews80.0% of reviews — better
Number of ratings527 — better
Update frequencyEvery 8 monthsEvery 11 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.612.0 — better
Further details — not scored
Size4 MB10 MB
Age rating4+4+
DeveloperMalcolm MugglinJens Guell

Customer experience

ChordMapMidi

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews17 reviews
Positive52.9%
Neutral11.8%
Negative35.3%

JAX Stereo Tool (AU)

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

In-app purchases

None

ChordMapMidi

No in-app purchases

None

JAX Stereo Tool (AU)

No in-app purchases

Questions

Is ChordMapMidi free?
ChordMapMidi costs $3.99, with no in-app purchases.
Is JAX Stereo Tool (AU) free?
JAX Stereo Tool (AU) costs $5.99, with no in-app purchases.
Which has better reviews, ChordMapMidi or JAX Stereo Tool (AU)?
ChordMapMidi is rated higher. ChordMapMidi averages 5.0 out of 5 from 5 ratings, while JAX Stereo Tool (AU) averages 4.4 from 27 ratings.
Do ChordMapMidi or JAX Stereo Tool (AU) have ads?
Neither ChordMapMidi nor JAX Stereo Tool (AU) shows ads.
Which is updated more often, ChordMapMidi or JAX Stereo Tool (AU)?
ChordMapMidi ships an update every 8 months, and JAX Stereo Tool (AU) every 11 days. Most recently, ChordMapMidi was updated on October 9, 2026 and JAX Stereo Tool (AU) on October 12, 2026.

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