Jublag vs iImprov
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Jublag
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World's first iPhone/iPad implementation of the main instruments of a Balinese Gamelan Gong Kebyar! The Jublag, also called Calung, is a six-key gangsa metallophone in the Balinese Gamelan Gong Kebyar and plays the core melody, supporting the main melody played by the giying. ** Note that the instrument produces very low-pitched sounds and require a high-quality sound system for best sound reproduction. The use of a high-quality headphone or external amplifier with good bass response is recommended. * Authentic sound bank sampled directly from real instruments * User interaction designed to replicate true playing experience * Playing sound can be stopped --- essential for Gamelan! * High-quality photos showcasing real instruments * Optimized for ultra-low latency audio playback * Zoomable views for detailed instrument exploration * Customizable display of cipher notations to suit your preferences * Completely ad-free for uninterrupted enjoyment
iImprov
This app helps jazz musicians of all levels master modal improvisation. It offers detailed explanations of theory, scale relationships, and practical exercises with audio and JAM-A-longs in various keys and styles. Tailored for modal tunes, it covers minor modal, 7 sus 4, and Major 7#4 progressions.
- Modal improvisation theory
- Scale and chord relation explanations
- Pentatonic scale usage
- Audio and visual scale examples
- Interactive JAM-A-longs
- Adjustable tempo and instrument balance
- Transposition selection
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iImprov-Modal is the 2nd release from Jazz Apps Mobile LLC. It is part of a series created for jazz musicians of all levels to help them take on specific challenges that any improvising musician will encounter. Each one contains a full explanation of all the concepts and theory involved as well as written and audio examples and exercises. Each app contains JAM-A-longs in all keys with adjustable tempo and control of instrument balance. Each iImprov app also allows you to select the correct transposition for your instrument. iImprov-Modal specifically provides the tools for confidently playing over modal tunes. The main focus of the app is playing over minor modal tunes, however we have also covered playing over 7 sus 4 modal tunes and Major 7#4 tunes. Exercises and JAM-A-longs specific to each of these types of tunes are included. Features- Full explanation of the concepts involved. Detailed theory of note to chord relations and use of modal scales. Detailed theory of how to use pentatonic scales, including how to play “outside.” Audio and visual representation of the related scales. Audio playback of the scales played over the appropriate chords. Exercises that include live audio examples from saxophonist Tony Bray. JAM-A-longs for Minor Modal (Swing and Funk). JAM-A-longs for 7 sus 4. JAM-A-longs for Major 7#4. Each JAM-A-long was recorded individually in order to give variation for each key. Mixer control for the JAM-A-Long instruments. Tempo control for each JAM-A-long. Unlimited JAM-A-long loop length.
Screenshots
Verdict
The clearest difference is iOS requirement: iImprov at 15.6 against Jublag's 18.0. On price, 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
Jublag costs $3.99 and iImprov $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Jublag ships an update every 20 months, iImprov every 28 months. The most recent releases landed on September 16, 2026 and July 22, 2026 respectively.
| Parameter | Jublag | iImprov |
|---|---|---|
| Price | $3.99 | $3.99 |
| Rating | — | 3.0 (2 ratings) — better |
| Positive reviews | — | 68.4% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 20 months — better | Every 28 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 30 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | emacsian Company Limited | Jazz Apps Mobile LLC |
In-app purchases
Jublag
No in-app purchases
iImprov
No in-app purchases





