Comparison

JAX ESSENTIALS vs Realbook Master

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

Head to head
About

JAX ESSENTIALS

This AudioUnit plugin creates multi-stage chorus effects for music production. It allows for micro pitch shifting and low-frequency oscillation to add depth and movement to audio signals, compatible across Apple devices.

Highlights
  • Multi-stage chorus modulation
  • Low-frequency oscillator control
  • Cross-device preset sharing
  • Includes ~200 factory presets
  • User-created preset import/export
  • Universal app for iOS, macOS, visionOS
Features
Read full description

( THIS IS AN AUDIOUNIT. AudioUnits are app extensions, requiring an audio host application to perform. ) Use the same AudioUnits across all modern Apple devices, including the iPhone , the Vision Pro and the Mac (Apple Silicon). Native MacOS apps like GarageBand, MainStage 3 and Logic Pro X are tested and supported. Any 3rd-party AUv3 supporting host should be able to host the plugin too. The JAX ESSENTIAL SERIES Chorus is a multi stage chorus modulation effect that uses multiple copies of the audio signal, micro pitch shifted, to produce all kinds of the famous chorus effect. A low frequency oscillator modulates depth and speed of the pitch shift on both stereo channels for various living and moving sound nuances. Make static sounding voices more interesting or create swirrling special effects. You may share the presets for this effect across all your supported devices. Around 200 factory presets are included, you can make and export/import your own. The manual is included and can be previewed on our support website. For advanced usage (i.e. mastering and exciting), we recommend to select the chorus from our SELECTIVE RANGE SERIES, which allows to limit the frequency range for processing. This build is truly 'universal', meaning, the audio unit is available for: - iOS (all actual iPhones) - iPadOS (all actual iPads) - macOS (Apple Silicon) - visionOS (Apple Vision Pro) Requirements: MacOS 10.15++ iOS 14.0++ Behaviour on all devices is identical. The parametric interface is resizeble and adopts to any screen size and orientation. This especially applies to Logic Pro X and all hosts with adjustable window sizes on all platforms. Display contrast can be adjusted freely and is now saved with each preset.

About

Realbook Master

This music app allows live performers to instantly transpose sheet music to any key. It supports various instruments and includes features for managing setlists and customizing the display. Ideal for musicians needing quick key changes on stage or in rehearsal.

Highlights
  • Transpose chords and melodies to all 12 keys
  • Download sheet music from forum
  • Lyrics On/Off
  • Select transposing instruments (bass clef)
  • Create and share setlists
  • Export transposed sheet music as PDF
  • MusicXML file support
Features
Read full description

The sheet music app that understands real live musicians. Swipe up or down to change keys on the fly - because the show MUST GO ON! Built for any musicians who perform live. Whether you're on stage, in rehearsal, or playing at church, Realbook Master gives you the instant freedom.

 Features : 1) Transpose chords and melodies to all 12 keys by swiping the sheet music or using +/- buttons in the top toolbar 2) Download sheet music from the forum 3) Lyrics On/Off 4) Select transposing instruments (bass clef support) 5) Create and share setlists 6) Export transposed sheet music as PDF 7) MusicXML file support 8) Supports various themes, music fonts, and background modes Perfect for: - Jazz musicians who need quick key changes - Wind players tired of transposing manually - Church musicians managing large song libraries - Bassists who need proper clef and range - Any performer who values speed and flexibility on stage

Screenshots

JAX ESSENTIALS4 screens
Realbook Master4 screens

Verdict

The call

The clearest difference is rating: JAX ESSENTIALS at 3.0 against Realbook Master's 1.0. JAX ESSENTIALS also leads on price ($4.99 vs $9.99) and iOS requirement (14.0 vs 17.6). Realbook Master's advantage is update cadence (weekly vs fortnightly). 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

CostPrice · In-app purchases · Ads · Monetization

JAX ESSENTIALS costs $4.99 and Realbook Master $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

JAX ESSENTIALS holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

UpkeepUpdate frequency

JAX ESSENTIALS ships an update fortnightly, Realbook Master weekly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
JAX ESSENTIALS versus Realbook Master: the parameters behind the verdict, then further details
ParameterJAX ESSENTIALSRealbook Master
Price$4.99 — better$9.99
Rating3.0 (2 ratings) — better1.0 (2 ratings)
Positive reviews—87.5% of reviews
Number of ratings22
Update frequencyFortnightlyWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS14.0 — better17.6
Further details — not scored
Size35 MB34 MB
Age rating4+4+
DeveloperJens GuellSanghyun Park

Customer experience

JAX ESSENTIALS

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%

Realbook Master

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews8 reviews
Positive87.5%
Neutral0.0%
Negative12.5%

In-app purchases

None

JAX ESSENTIALS

No in-app purchases

None

Realbook Master

No in-app purchases

Questions

Is JAX ESSENTIALS free?
JAX ESSENTIALS costs $4.99, with no in-app purchases.
Is Realbook Master free?
Realbook Master costs $9.99, with no in-app purchases.
Which has better reviews, JAX ESSENTIALS or Realbook Master?
JAX ESSENTIALS is rated higher. JAX ESSENTIALS averages 3.0 out of 5 from 2 ratings, while Realbook Master averages 1.0 from 2 ratings.
Do JAX ESSENTIALS or Realbook Master have ads?
Neither JAX ESSENTIALS nor Realbook Master shows ads.
Which is updated more often, JAX ESSENTIALS or Realbook Master?
JAX ESSENTIALS ships an update fortnightly, and Realbook Master weekly. Most recently, JAX ESSENTIALS was updated on October 24, 2026 and Realbook Master on October 25, 2026.

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