# iImprov vs Jazz Progression Trainer

The clearest difference is update cadence: Jazz Progression Trainer at every 6 months against iImprov's every 32 months. Jazz Progression Trainer also leads on price ($2.99 vs $3.99). iImprov's advantage is device support (3 vs 1) and iOS requirement (8.0 vs 16.4). On ads and in-app purchases there is nothing between them.

iImprov costs $3.99 and Jazz Progression Trainer $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iImprov ships an update every 32 months, Jazz Progression Trainer every 6 months. The most recent releases landed on October 29, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | iImprov | Jazz Progression Trainer |
| --- | --- | --- |
| Price | $3.99 | **$2.99** |
| Rating | **[4.9 (7 ratings)](https://appshunter.io/ios/app/iimprov-bebop/id572415820/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 6 months** |
| Monetization | Paid | — |
| Size | 19 MB | 28 MB |
| Requires iOS | **8.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jazz Apps Mobile LLC](https://appshunter.io/developer/421582808) | [tabito ozaki](https://appshunter.io/developer/1884003335) |

## What reviewers say

### iImprov

[App page](https://appshunter.io/ios/app/iimprov-bebop/id572415820)

Explore the language of Bebop with comprehensive lessons and interactive jam-alongs. Learn to master bebop scales, develop longer phrases, and practice chord substitutions with tempo-adjustable audio examples and transposable notation.

**Highlights:** Bebop scale realization, Phrase development techniques, Turnarounds and chord substitutions, Confirmation sequence breakdown, I Got Rhythm changes practice, Tempo-adjustable jam-alongs, Transposable notation

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Jazz Progression Trainer

[App page](https://appshunter.io/ios/app/jazz-progression-trainer/id6761685294)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iImprov free?

iImprov costs $3.99, with no in-app purchases.

### Is Jazz Progression Trainer free?

Jazz Progression Trainer costs $2.99, with no in-app purchases.

### Do iImprov or Jazz Progression Trainer have ads?

Neither iImprov nor Jazz Progression Trainer shows ads.

### Which is updated more often, iImprov or Jazz Progression Trainer?

iImprov ships an update every 32 months, and Jazz Progression Trainer every 6 months. Most recently, iImprov was updated on October 29, 2026 and Jazz Progression Trainer on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*