Comparison

StringMaster Pro vs Scaler 3

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

Head to head
About

StringMaster Pro

This advanced music app helps musicians of all levels learn and master fretted instruments. It offers tools for chords, scales, songwriting, and includes a tuner and fretboard learning system. Supports a wide range of instruments and integrates with wireless Fretlight Guitars.

Highlights
  • Chord building and detection
  • Fretboard learning system
  • Advanced songwriting tools
  • Chromatic tuner and metronome
  • Instrument comparison
  • MIDI output
Read full description

Introducing StringMaster Pro – the pinnacle of advanced music applications for iPad and Mac, tailored for musicians ranging from relative beginners to seasoned guitarists & other fretted instrument musicians. The StringMaster family has five versions catering to diverse needs with StringMaster Pro seamlessly integrating all features, making it the ultimate companion for any fretted instrument including wireless Fretlight Guitars. Unlock a world of possibilities with support for chords, chord tones, scales, and songwriting, backed by a chromatic tuner, fretboard learning, instrument comparison, and more. The StringMaster family boasts over 150,000 users and having held the #1 Music App position in 34 countries. StringMaster Pro supports an array of instruments, from acoustic and electric guitars to bass guitars, banjos, mandolins, ukuleles, pianos, and even balalaikas. Dive into a rich sound library with distortion, reverb, or piano options for any instrument. Whether you're a guitarist, bassist, or multi-instrumentalist, StringMaster Pro has you covered. Key features include chord building and detection, a comprehensive fretboard learning system, advanced songwriting tools, and flexible alternate tuning and capo support for any instrument in any orientation. StringMaster 4 introduces piano keyboard support, allowing seamless mapping of guitar chords to the piano keyboard. Explore the robust capabilities of StringMaster Pro: * Play and discover chords and fingering with natural tones. * Display and play scales, including scale runs up the fretboard. * Visualize chord notes, suggested fingering, and Chord Tones. * Utilize the unique Note Finding capability to learn notes and their relative positions on the fretboard. * Benefit from the integrated Chromatic Tuner and Metronome, playable in the background. * Leverage StringMaster's chord-naming algorithms based on finger positions. * Unleash your creativity with the Song Writer, recommending chord progressions and facilitating songwriting. * Master instruments by comparing chords, patterns, and fingerings across a variety of instruments. * Output MIDI from played notes and play along with MIDI tracks from the built-in library. Experience the next level of musical exploration and education with StringMaster Pro – where versatility meets excellence. Join the global community of musicians who have made StringMaster their go-to app for musical innovation. Download StringMaster Pro now and elevate your musical journey to new heights! Note: Fretlight Ready™ designates that an app can send its data over Bluetooth to a Fretlight® guitar and light its fretboard. To learn more about Fretlight guitars go to www.fretlight.com This Application is developed and maintained by Great Apptitude, an independent app developer for use with the Fretlight Guitar. Optek Music Systems, the owner of the Fretlight Guitar brand, accepts no responsibility for the development, maintenance or support for this Application.

About

Scaler 3

This music theory workstation helps you discover chords, explore harmony, and build complete musical ideas. It offers a redesigned workflow, expanded creative potential, and powerful new capabilities for songwriting and music production.

Highlights
  • Discover music's key with MIDI and audio detection
  • Access over 1,000 chord sets, keys, and modes
  • Build intelligent chord progressions with automatic voice-leading
  • Structure full musical ideas with Scenes and Arrange Page
  • Transform chords into melodies, basslines, and phrases
  • Explore harmony with Circle of Fifths and modulation tools
  • Host AUv3 plugins and interoperate with desktop versions
Features
Read full description

The world’s most popular music theory workstation, Scaler 3, is now available on iPad — updated to Scaler 3.3 with Multi-Bind, improved Detection, enhanced workflow and desktop interoperability. With a redesigned workflow, expanded creative potential and powerful new capabilities, Scaler 3 helps you discover chords, explore harmony and build complete musical ideas. The workflow doesn’t have to end with your finished chord progression - Scaler 3 can host AUv3 plugins and features a full arranger and mixer, letting it fit into your existing setup or become your entire creative environment for music theory. Browse Draw from over 1000 chord sets, keys and modes, organised by mood, artist and genre. Build chord progressions by dragging and dropping chords, and receive intelligent suggestions for what could come next. Create Explore harmonic possibilities using tools like the Sketch Pad, Explore page, Circle of Fifths and Modulation pathways. Scaler’s creative tools and music theory assistance help you move beyond common progressions and discover new musical ideas. Arrange Turn your progression into a full musical sketch with tracks for chords, bass, melodies and custom MIDI patterns. Use Multi-Bind to perform and loop multiple lanes at once, creating fast composition ideas and live performance workflows. Scaler 3 can generate MIDI for all sorts of instruments and adapt it to the needs of your song. Host AUv3 plugins to play your parts, transforming Scaler 3 into a powerful composition and MIDI production environment. Key Features • Discover your music’s key with MIDI and audio detection and explore compatible scales, modes and chord sets • Access over 1,000 chord sets, keys and modes organised by mood, genre and artist inspiration • Build intelligent chord progressions with automatic voice-leading • Use Scenes and the Arrange Page timeline to structure full musical ideas • Transform chords into melodies, basslines, arpeggios and phrases using Scaler’s Motions library • Explore harmony using the Circle of Fifths, chord substitutions, inversions and voicing tools • Experiment with modulation suggestions to move between keys • Record ideas directly with User Track and edit them in the piano roll • Perform one-finger chords and melodies using Bind MIDI • Route generated chords and performances to other music apps using AUv3 and MIDI output • Play progressions using internal instruments including pianos, synths and orchestral sounds • Works standalone or alongside apps like Logic Pro for iPad, GarageBand, AUM and Cubasis • Move between Scaler 3 on iPad and desktop by sharing presets, chord progressions and files Content • Thousands of chords, scales and harmonic possibilities • Artist chord sets created by musicians including Carl Cox, MJ Cole and The Temper Trap • Generate MIDI with hundreds of melodic phrases, basslines and performances • Internal instrument library including pianos, synths and orchestral sounds Perfect For • Songwriting • Music production • Composition • Learning harmony and music theory • Exploring new musical ideas What People Are Saying “Scaler 3 is an incredibly powerful music theory tool. It's a gamechanger for both beginners and seasoned producers.” -David Wills (Michael Jackson, Whitney Houston, Phil Collins) “Scaler 3 opens up a whole new world of possibilities… a fantastic gateway into harmony and composition.” -Daryl Bennett (Grammy-nominated composer) “Scaler 3 has evolved into a fully-fledged compositional toolkit. A triumph.” -Sound On Sound “Scaler 3 delivers the most comprehensive, powerful set of composition tools you can get.” -Attack Magazine “Scaler 3 takes everything that made Scaler 2 brilliant and makes it even better.” -The Sound Test Room Awards • KVR Readers Choice Awards - Winner 2025 • Plugin Boutique Awards - Best Music Theory Software 2025 • Sanjay C #1 Tool - Top Plugin of 2025 • #1 Music Theory App - Future Music Magazine 2024

Verdict

The call

The clearest difference is update cadence: Scaler 3 at fortnightly against StringMaster Pro's every 3 months. Scaler 3 also leads on rating (4.7 vs 4.5) and ratings volume (167 vs 20). StringMaster Pro's advantage is review sentiment (67% vs 57%) and iOS requirement (13.0 vs 16.0). 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

StringMaster Pro costs $14.99 and Scaler 3 $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Scaler 3 holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Scaler 3 has 167 ratings behind it against 20, so its average is the more settled of the two. Written reviews complicate that: 67% of StringMaster Pro's written reviews are positive against 57% of Scaler 3's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

StringMaster Pro ships an update every 3 months, Scaler 3 fortnightly. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 4 level
StringMaster Pro versus Scaler 3: the parameters behind the verdict, then further details
ParameterStringMaster ProScaler 3
Price$14.99$12.99 — better
Rating4.5 (20 ratings)4.7 (167 ratings) — better
Positive reviews66.7% of reviews — better56.7% of reviews
Number of ratings20167 — better
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPad, Mac — betteriPad
Requires iOS13.0 — better16.0
Further details — not scored
Size171 MB1.1 GB
Age rating4+4+
DeveloperGreat Apptitude Pty LtdScaler Music

Customer experience

StringMaster Pro

All ratings20 ratings
Positive90.0%
Neutral0.0%
Negative10.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Scaler 3

All ratings162 ratings
Positive92.0%
Neutral4.3%
Negative3.7%
Written reviews30 reviews
Positive56.7%
Neutral23.3%
Negative20.0%

In-app purchases

None

StringMaster Pro

No in-app purchases

None

Scaler 3

No in-app purchases

Questions

Is StringMaster Pro free?
StringMaster Pro costs $14.99, with no in-app purchases.
Is Scaler 3 free?
Scaler 3 costs $12.99, with no in-app purchases.
Which has better reviews, StringMaster Pro or Scaler 3?
Scaler 3 is rated higher. StringMaster Pro averages 4.5 out of 5 from 20 ratings, while Scaler 3 averages 4.7 from 167 ratings.
Do StringMaster Pro or Scaler 3 have ads?
Neither StringMaster Pro nor Scaler 3 shows ads.
Which is updated more often, StringMaster Pro or Scaler 3?
StringMaster Pro ships an update every 3 months, and Scaler 3 fortnightly. Most recently, StringMaster Pro was updated on October 24, 2026 and Scaler 3 on October 30, 2026.

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