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Best Key Signatures Apps

249+ iOS apps curated and reviewed

4.2 avg rating
18 free apps
Updated September 2026

The best key signatures apps on iPhone average 4.2★ across 249+ titles — we've ranked them by what real users actually keep on their phones. Updated September 2026.

Compare top Key Signatures Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1MyMusicTheory - Music TheoryMyMusicTheory - Music TheoryFree4.7★ (896)YesYesSep 2026
2Key Maestro: Key SignaturesKey Maestro: Key SignaturesFree—NoNoAug 2026
3Piano Chords and ScalesPiano Chords and ScalesFree4.8★ (9.2K)NoYesSep 2026
4Music Theory Keys •Music Theory Keys •$0.993.3★ (4)NoNoAug 2026
5Notevision - Sight ReadingNotevision - Sight ReadingFree4.8★ (3.2K)NoYesSep 2026
6EarpeggioEarpeggioFree4.9★ (9.7K)NoNoSep 2026
7Keys TrainerKeys Trainer$2.995.0★ (1)NoNoAug 2026
8My Key 1.0My Key 1.0Free—NoNoMay 2026

Top Picks for Key Signatures

MyMusicTheory - Music Theory#1

MyMusicTheory - Music Theory by myrApps

Exercises, lessons and quizzes
Editor's Choice
📚 Education
4.7😊(896 ratings)
FreeAdsIn-App Purchases
MyMusicTheory - Music Theory screenshot 1
MyMusicTheory - Music Theory screenshot 2
MyMusicTheory - Music Theory screenshot 3
MyMusicTheory - Music Theory screenshot 4

Master music theory with interactive exercises, lessons, and quizzes. Covers a wide range of topics from basic notes to complex chords and scales. Supports various clefs and naming schemes for comprehensive learning.

What We Love

  • 🎉 Helpful for learning music theory
  • 💯 Great for practicing notes, chords, and intervals
  • 📚 Comprehensive coverage of music theory concepts
  • 🏆 Effective for passing music theory exams
  • 🤑 Affordable lifetime premium option

Room to Improve

  • 😞 Discouraging feedback when learning
  • 💰 Paywall for full app experience
  • 🤔 Some exercises use confusing or incorrect notation
  • 🌍 Terminology not aligned with regional standards
Piano Chords and Scales#3

Piano Chords and Scales by Sincere Apps

Learn, play and compose songs
Worth Considering
🎵 Music
4.8😊(9.2K ratings)
FreeIn-App Purchases
Piano Chords and Scales screenshot 1
Piano Chords and Scales screenshot 2
Piano Chords and Scales screenshot 3
Piano Chords and Scales screenshot 4
Piano Chords and Scales screenshot 5
Piano Chords and Scales screenshot 6

Explore chords, scales, and progressions to compose music. Visualize musical structures on a virtual piano and staff, with interactive tools and audio playback. Ideal for musicians of all levels seeking inspiration and understanding.

What We Love

  • 🚀 Great app, great value for money
  • 👍 Useful for learning piano
  • 👍 Helpful for music production
  • 👍 Intuitive and easy to use
  • 👍 Comprehensive chord and scale library
  • 👍 Useful for composing and songwriting

Room to Improve

  • 🐛 Bugs and glitches in desktop and mobile versions
  • 💰 Expensive for full version
  • 🤔 Some features not as intuitive as expected

More Key Signatures apps to explore

FAQ about Key Signatures

What are the best key signatures apps for iPhone?
MyMusicTheory - Music Theory tops our key signatures apps ranking as of September 2026, with a 4.7-star average from 896 App Store ratings, and it's free to download.
Yes — 18 of the top key signatures apps we rank are free to download, including MyMusicTheory - Music Theory and Key Maestro: Key Signatures.
MyMusicTheory - Music Theory shows ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 249+ key signatures apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
MyMusicTheory is an application designed to help users practice music theory and improve their sight reading skills. It offers lessons, exercises, and quizzes covering a broad spectrum of music theory topics, from basic note identification to advanced chord and scale analysis.
The app covers key signatures, intervals (including compound intervals), various chord types (triads, sevenths, extended, suspended, inversions), all scale modes of major and minor scales, diatonic chord degrees, and rhythm exercises. It also supports multiple clefs like treble, bass, alto, and tenor.

Related searches

key maestro: key signatures