Comparison

iImprov vs OnKey

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

OnKey

This app generates readable, note-based exercises for practicing scales and chords. It's ideal for musicians of all levels looking for a focused and efficient way to improve their technique and theory knowledge without manual preparation.

Highlights
  • Generate note-based exercises
  • Select scale or chord type
  • Transpose to any key
  • Set range and clef
  • Choose from various patterns
  • Add note names and time signatures
Features
Read full description

OnKey Scale Practice is a simple, effective tool that helps musicians practice scales and chords with clarity and focus. Just enter your preferences and instantly generate readable, note-based exercises—no more flipping through books or writing them out by hand. Perfect for warm-ups, technique drills, or theory work, whether you're a beginner or an advanced player. Features: Select your scale or chord type Transpose to any key Set your range and clef Choose from various patterns Add note names and time signatures Designed for flexibility. Built for clarity. For all instruments.

Screenshots

iImprov4 screens
OnKey4 screens

Verdict

The call

The clearest difference is review sentiment: iImprov at 100% against OnKey's 0%. iImprov also leads on rating (4.9 vs 3.0) and ratings volume (7 vs 2). OnKey's advantage is update cadence (every 2 months vs every 32 months). On ads, in-app purchases, monetization model and device support 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 OnKey $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

iImprov holds the better App Store score, 4.9 against 3.0. Both are backed by a comparable volume of ratings — 7 and 2 respectively. Written reviews point the same way: 100% of iImprov's written reviews are positive against 0% of OnKey's.

UpkeepUpdate frequency

iImprov ships an update every 32 months, OnKey every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard6 real differences · 4 level
iImprov versus OnKey: the parameters behind the verdict, then further details
ParameteriImprovOnKey
Price$3.99 — better$4.99
Rating4.9 (7 ratings) — better3.0 (2 ratings)
Positive reviews100.0% of reviews — better0.0% of reviews
Number of ratings7 — better2
Update frequencyEvery 32 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better14.1
Further details — not scored
Size19 MB2 MB
Age rating4+4+
DeveloperJazz Apps Mobile LLCRea Meir

Customer experience

iImprov

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews7 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

OnKey

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

iImprov

No in-app purchases

None

OnKey

No in-app purchases

Questions

Is iImprov free?
iImprov costs $3.99, with no in-app purchases.
Is OnKey free?
OnKey costs $4.99, with no in-app purchases.
Which has better reviews, iImprov or OnKey?
iImprov is rated higher. iImprov averages 4.9 out of 5 from 7 ratings, while OnKey averages 3.0 from 2 ratings.
Do iImprov or OnKey have ads?
Neither iImprov nor OnKey shows ads.
Which is updated more often, iImprov or OnKey?
iImprov ships an update every 32 months, and OnKey every 2 months. Most recently, iImprov was updated on November 1, 2026 and OnKey on November 3, 2026.

Other comparisons