Comparison

iImprov vs Jazz Progression Trainer

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

Head to head
About

iImprov

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
Read full description

iImprov - Bebop This latest in the iImprov series from Jazz Apps Mobile is designed to help take the mystery out of the language of Bebop. There are 9 comprehensive lessons and 8 JAM- A-longs. Each lesson contains a detailed explanation as well as exercises, transposable notation and tempo-adjustable audio examples. Many of the concepts are also demoed by saxophonist Tony Bray at the end of the lessons. The topics covered include: - How to fully realize the bebop scale through strategic placement of half steps to ultimately include all twelve notes of the chromatic scale while maintaining appropriate chord colors. - How to develop longer phrases. - Turnarounds and chord substitutions. (Includes tempo adjustable examples that loop and transpose for practicing over.) - A breakdown of the Confirmation sequence. - Various approaches to playing over I Got Rhythm changes. JAM-A-longs include individually created files for each key. Each will loop indefinitely, all keys are covered and tempos are adjustable. The included JAM-A-longs are: - V7 - II V I - I Got Rhythm 1 - I Got Rhythm 2 - Confirmation Sequence - Turnaround 1 - Turnaround 2 - Turnaround 3 As with other other Jazz Apps Mobile apps, you can set the notation clef and the overall transposition for your specific instrument and there is balance control for the JAM-A-Longs. Happy Practicing!

About

Jazz Progression Trainer

Features
Read full description

Jazz Progression Trainer is a practice tool designed for jazz musicians who want to internalize chord progressions by ear. Play along with a full rhythm section Listen to a real piano, walking bass, and drums as you practice. Each progression is performed at your chosen tempo, looping continuously so you can focus on your instrument. Progressions included Major II-V-I Minor II-V-I Jazz Blues (12-bar) Minor Blues (12-bar) Rhythm Changes (AABA, 32-bar) All 12 keys Transpose any progression instantly to any key. Build fluency across the entire harmonic universe. Adjustable tempo Set the BPM anywhere from 60 to 300. Start slow, build confidence, then push the speed. Visual chord guide The current chord is highlighted on screen as the progression plays, so you can always see where you are in the form. Whether you're a beginner learning your first turnaround or an advanced player drilling changes at 240 BPM, Jazz Progression Trainer keeps up with you.

Screenshots

iImprov4 screens
Jazz Progression Trainer3 screens

Verdict

The call

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.

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

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
iImprov versus Jazz Progression Trainer: the parameters behind the verdict, then further details
ParameteriImprovJazz Progression Trainer
Price$3.99$2.99 — better
Rating4.9 (7 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings7 — better—
Update frequencyEvery 32 monthsEvery 6 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS8.0 — better16.4
Further details — not scored
Size19 MB28 MB
Age rating4+4+
DeveloperJazz Apps Mobile LLCtabito ozaki

In-app purchases

None

iImprov

No in-app purchases

None

Jazz Progression Trainer

No in-app purchases

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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