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Best Key Signatures Apps

249+ iOS apps curated and reviewed

4.6 avg rating
18 free apps
Updated August 2026

The best key signatures apps on iPhone average 4.6★ across 249+ titles — we've ranked them by what real users actually keep on their phones. Updated August 2026.

Compare top Key Signatures Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1MyMusicTheory - Music TheoryMyMusicTheory - Music TheoryFree4.7★ (893)YesYesAug 2026
2Key Maestro: Key SignaturesKey Maestro: Key SignaturesFree—NoNoMay 2026
3EarpeggioEarpeggioFree4.9★ (9.5K)NoNoAug 2026
4Piano Chords and ScalesPiano Chords and ScalesFree4.8★ (9.1K)NoYesAug 2026
5Notevision - Sight ReadingNotevision - Sight ReadingFree4.8★ (3.2K)NoYesAug 2026
6Music Theory Keys •Music Theory Keys •$0.993.3★ (4)NoNoJun 2026
7IIT Sign ClientIIT Sign ClientFree—NoNoMay 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😊(893 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

Room to Improve

  • 😞 Discouraging feedback when learning
  • 💰 Paywall for full app experience
  • 🤔 Some exercises use confusing or incorrect notation
Earpeggio#3

Earpeggio by Balazs Kiss

Musical Ear Training Exercises
Worth Considering
🎵 Music
4.9😊(9.5K ratings)
Free
Earpeggio screenshot 1
Earpeggio screenshot 2
Earpeggio screenshot 3
Earpeggio screenshot 4
Earpeggio screenshot 5
Earpeggio screenshot 6

Enhance your musical abilities by training your ear to recognize intervals, chords, scales, and rhythms. This app offers various exercises and tests to help you improve your musical hearing and track your progress with detailed statistics.

What We Love

  • 👍 Great for ear training
  • 🚀 Efficient and easy to use
  • 💡 Customizable exercises
  • 🤑 Completely free with no ads

Room to Improve

  • 🐛 Occasional bugs and crashes
  • 🔇 Poor sound quality of instruments
  • 🤔 Unclear instructions for beginners

More Key Signatures apps to explore

4
Piano Chords and Scales
Piano Chords and Scales
Piano Chords and Scales
Learn, play and compose songs
Free

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.

Chord and scale collectionsSong composer with recommendationsVirtual piano and staff views
🎵 Music
(9.1K)
free with in-app purchases
5
Notevision - Sight Reading
Notevision - Sight Reading
Notevision - Sight Reading
Piano, violin, viola & cello
Free

Master sight-reading and build musical skill with interactive exercises. Practice using a MIDI instrument, microphone, or on-screen keyboard. Learn music theory and chords with adaptive difficulty and progress tracking.

Interactive sight-reading exercisesMIDI, microphone, or on-screen keyboard inputAdaptive difficulty levels
📚 Education
(3.2K)
free with in-app purchases
6
Music Theory Keys •
Music Theory Keys •
Music Theory Keys •
Key Signatures testing
$0.99

This app helps musicians identify key signatures for major, minor, and diatonic modes. It features customizable quiz settings and a 'Grade Book' to track and share results, beneficial for students and professionals alike.

Key signature recognition (Major, Minor, Modes)Customizable quiz settings (sharps/flats, key groups)Multiple clef support (Treble, Alto, Tenor, Bass)
🎵 Music
(4)
paid
7
IIT Sign Client
IIT Sign Client
IIT Sign Client
Sign data
Free
💼 Business
(0)
8
My Key 1.0
My Key 1.0
My Key 1.0
by Yury Maslov
Free
🔧 Utilities
(0)
9
Keys Trainer
Keys Trainer
Keys Trainer
Master Key Signatures & Scales
$2.99

Master key signatures and scales with this music learning app. Practice identifying keys, understanding note sharps/flats, and instantly recognizing scale layouts on a keyboard. Features include customizable practice, passive viewing, and a challenging game mode.

Key signature recognitionScale layout identificationCustomizable learning range
🎵 Music
(1)
paid
10
Sign My PDF Documents-PDF Sign
Sign My PDF Documents-PDF Sign
Sign My PDF Documents-PDF Sign
Sign My PDF Documents
Free
🌟 Lifestyle
(0)
11
LockSign: Secure Signatures
LockSign: Secure Signatures
LockSign: Secure Signatures
Securely sign PDFs & documents
Free
💼 Business
(0)
12
KEYMO
KEYMO
KEYMO
by BYSTAMP
Free

Digitally sign and seal documents on your mobile device without an internet connection. This app streamlines document processing by eliminating the need for printing, manual stamping, and scanning, saving time and resources. It utilizes advanced security features for authentic and secure electronic signatures.

Offline electronic sealing and signingEliminates printing and scanningAdvanced security with cryptographic chip
💼 Business
(0)
free
13
SigningBook - Event Signatures
SigningBook - Event Signatures
SigningBook - Event Signatures
by Throwr Pty Ltd
Free
🌟 Lifestyle
(0)
14
E Sign PDF: Document Signer
E Sign PDF: Document Signer
E Sign PDF: Document Signer
Signature Maker & PDF Signer
Free
📊 Productivity
(0)
15
Sign Documents: PDF Signatures
Sign Documents: PDF Signatures
Sign Documents: PDF Signatures
Fill & Sign Forms, eSign Docs
Free
💼 Business
(0)
16
rSign by Cencert
rSign by Cencert
rSign by Cencert
by ENIGMA SYSTEMY OCHRONY INFORMACJI SP Z O O
Free

This app replaces physical signature cards and readers for placing qualified electronic signatures. It allows you to sign documents on any computer without needing specialized hardware, ensuring you never forget your signature card again.

Qualified electronic signature placementReplaces physical signature cardsEliminates need for card readers
🔧 Utilities
(0)
free
17
signaturiX
signaturiX
signaturiX
Electronic Signature
Free
📊 Productivity
(0)
18
Sign Documents x Signature PDF
Sign Documents x Signature PDF
Sign Documents x Signature PDF
Sign Docs in a Snap
Free
💼 Business
(0)
19
Order My Key
Order My Key
Order My Key
Lost & Car Key Duplicates
Free
🔧 Utilities
(0)
20
portier KeyOnTheGo
portier KeyOnTheGo
portier KeyOnTheGo
by portier Global Pty Ltd
Free
🔧 Utilities
(0)

FAQ about Key Signatures

What are the best key signatures apps for iPhone?
MyMusicTheory - Music Theory tops our key signatures apps ranking as of August 2026, with a 4.7-star average from 893 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 August 2026.
We track 249+ key signatures apps on the iOS App Store as of August 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