Comparison

Scales Lexicon vs OnKey

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

Head to head
About

Scales Lexicon

This app provides a comprehensive library of musical scales with notation and audio playback. It offers transposition for various instruments and clefs, customizable rhythmic patterns, and the ability to export notation as PDFs. Practice scales with visual feedback on highlighted notes and piano keys.

Highlights
  • Over 100 musical scales
  • Audio playback with visual note highlighting
  • Transposition for multiple instruments and clefs
  • Customizable rhythmic patterns and octaves
  • PDF export of notation
  • Forward and backward scale playback
Read full description

Over 100 scales notated and played for you, including note names, diatonic and melodic intervals. Transposition for instruments in Ab, Eb, Bb, F, C, G, D, A, and E. Play along! Create a pdf of the notation and piano key markings for sharing or printing. Listen and watch the notes and piano keys highlight as it plays. Notation in treble, alto, tenor or bass clef. See the scale notated correctly, with double sharps and flats as needed. For example, Gb minor has a B double flat, not an A. Concert key signatures are supported to the common seven sharps or flats. Transposing key signatures can contain twelve sharps or flats or if selected, use the preferred enharmonic equivalent. Have the scale played in a wide variety of ways. • Choose from 11 rhythmic patterns. • Choose 1, 2 or 3 octaves. • Loop continuously, or play just once through. • Select the space between each loop. • Choose if you want the scale played forward and backward (up and down), or just forward. • Includes an optional 2 or 4 beat count-off. Drive your own software or hardware synth via MIDI to hear what you want, or use the app's own acoustic piano. A quick and easy reference tool for practicing your instrument. Broaden your knowledge and technique. Included scales: • Common: Major Natural Minor Harmonic Minor Melodic Minor - Up & Down Whole-Half Diminished Half-Whole Diminished Whole-tone Chromatic • Modes: Ionian Dorian Phrygian Lydian Mixolydian Aeolian Locrian • Jazz: Major Pentatonic Minor Pentatonic Blues Blues Modified Blues Phrygian Blues Diminished Bebop Bebop Major Bebop Dominant Bebop Minor Bebop Minor 2 Harmonic Major Phrygian Dominant Lydian Dominant (Overtone) Lydian Augmented Augmented Half Diminished 1 Half Diminished 2 Diminished Whole Tone 6th Mode of Harmonic Minor Neapolitan Major Neapolitan Minor Harmonic Neapolitan Minor Prometheus • Hindustani Thaats: Bilawal Kalyan Khamaj Bhairav Poorvi Marwa Kafi Asavari Bhairavi Todi • World: Algerian Arabian Byzantine Hawaiian Hindu Hungarian or Egyptian Indian Indian Minor Jewish or Spanish Oriental Persian Romanian Bocovia Romanian Major Romanian Minor • China: Bi Yu Chaio Kung Youlan • Japan: Han-kumoi Hira-joshi Honchoshi Plagal Form Iwato Kokin-joshi, Miyakobushi Nohkan Ritsu Sakura Pentatonic Sansagari Taishikicho, Ryo • Composers: Prokofiev Scriabin Shostakovich Verdi Enigmatic Verdi Enigmatic - Up & Down • Messiaen Modes: Mode 1 - Whole Tone Mode 2 - Half-Whole Diminished Mode 3 Mode 3 Inverse Mode 4 Mode 4 Inverse Mode 5 Mode 5 Inverse Mode 6 Mode 6 Inverse Mode 7 Mode 7 Inverse Truncated Mode 2 Truncated Mode 3 Truncated Mode 3 Inverse Truncated Mode 5 Truncated Mode 5 Inverse Truncated Mode 6 Truncated Mode 6 Inverse

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

OnKey4 screens

Verdict

The call

The clearest difference is review sentiment: Scales Lexicon at 86% against OnKey's 0%. Scales Lexicon also leads on rating (5.0 vs 3.0) and price ($2.99 vs $4.99). OnKey's advantage is update cadence (every 2 months vs every 24 months) and device support (3 vs 1). 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

Scales Lexicon costs $2.99 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

Scales Lexicon holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews point the same way: 86% of Scales Lexicon's written reviews are positive against 0% of OnKey's.

UpkeepUpdate frequency

Scales Lexicon ships an update every 24 months, OnKey every 2 months. The most recent releases landed on October 23, 2026 and November 3, 2026 respectively.

Scorecard6 real differences · 4 level
Scales Lexicon versus OnKey: the parameters behind the verdict, then further details
ParameterScales LexiconOnKey
Price$2.99 — better$4.99
Rating5.0 (5 ratings) — better3.0 (2 ratings)
Positive reviews85.7% of reviews — better0.0% of reviews
Number of ratings5 — better2
Update frequencyEvery 24 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS26.514.1 — better
Further details — not scored
Size40 MB2 MB
Age rating4+4+
DeveloperPatrick Q. KellyRea Meir

Customer experience

Scales Lexicon

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews14 reviews
Positive85.7%
Neutral7.1%
Negative7.1%

OnKey

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

In-app purchases

None

Scales Lexicon

No in-app purchases

None

OnKey

No in-app purchases

Questions

Is Scales Lexicon free?
Scales Lexicon costs $2.99, with no in-app purchases.
Is OnKey free?
OnKey costs $4.99, with no in-app purchases.
Which has better reviews, Scales Lexicon or OnKey?
Scales Lexicon is rated higher. Scales Lexicon averages 5.0 out of 5 from 5 ratings, while OnKey averages 3.0 from 2 ratings.
Do Scales Lexicon or OnKey have ads?
Neither Scales Lexicon nor OnKey shows ads.
Which is updated more often, Scales Lexicon or OnKey?
Scales Lexicon ships an update every 24 months, and OnKey every 2 months. Most recently, Scales Lexicon was updated on October 23, 2026 and OnKey on November 3, 2026.

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