# Keys-Chords > Music theory app for understanding key-chord relationships and transposing songs. (iPhone/iPad app by Salvatore Caruso.) - Source: https://appshunter.io/ios/app/keys-chords/id480600069 (this page in markdown: same URL + `.md`) - Developer: [Salvatore Caruso](https://appshunter.io/developer/474412349) - Category: Music, Music, Education - Price: $1.99 - Rating: 5.00/5 from 1 App Store ratings · 8 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 8 MB - Languages: English - Released: 2011-11-19 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/keys-chords/id480600069/reviews.md ## What is Keys? Keys-Chords will help music students, musicians, vocalist and music aficionados understand the relationship between Keys and Chords in the Major music keys. It is an ideal app for musicians who play the Guitar, Piano, Base or any instrument that can play a chord. in addition, It is a useful aid for anyone who wants to understand the musical relationship between keys and chords. Keys-Chords will remove the mystery and help you understand how to Transpose chords from one key to another. The user interface consists of two views. The Chord view and the Transpose view. The Chord view identifies/displays the seven Chords in each key as a major, minor or diminished chord. The Transpose view will help musicians and vocalists change chords to play or sing a song in any of the major keys. ## Key features - Understand key-chord relationships - Identify major, minor, and diminished chords - Transpose chords between keys - Chord view - Transpose view - Ideal for guitar, piano, and bass players ## Recent user reviews (8 of 8) All indexed reviews: https://appshunter.io/ios/app/keys-chords/id480600069/reviews.md ### 5/5 — Awesome *2019-03-19, version 1.9* Simple but it’s super helpful ### 4/5 — Minor keys *2012-07-16, version 1.5* This app is awesome but they need to add the minor keys. ### 3/5 — Limited *2012-05-27, version 1.5* Good if you're looking to transpose the major keys, but this app only covers the major keys. If you're looking for any type of modal progression quick reference you won't find it here. ### 3/5 — Not bad. Could offer more. *2012-03-26, version 1.4* CONS: A bit pricey for what it offers. Needs a new font because the upper- and lower-case roman numerals 'i' and 'I' are very hard to distinguish at present. Contains no useful information regarding application of the keys, merely identifies the chords in each key. Gives no information regarding the chords themselves, just identifies them by name. PROS: A great app for those looking to transpose a lot. Easy-to-use interface. Clean look. Nice for quick-reference. I would reiterrate that a font change is necessary to clearly label the chords in each scale with the appropriate roman numerals. ### 5/5 — Finally!!!!!!!!!! *2011-12-10, version 1.2* I just bought this app and was so excited about it i had to write this. As a music teacher of guitar, theory and voice, I am excited about this app. It makes the understanding of the harmonized scales easy. It shows the chords as they are in the different keys and it makes it easier to understand the keys that are harder for students to work with. This app will help players that play by ear also. It will let them know what chords to expect in a new song and they can find the chords in parallel keys. The transposing ability of the app will help all musicians and vocalist that have to change keys to play or sing a song. Many thanks to the writer of this app. A useful app that does what the name says. BRAVO!!! Bill Sveglini ### 5/5 — Just what I was looking for *2011-12-10, version 1.2* What a great tool! I have been struggling a bit to transpose some pieces for guitar - this easy to use App makes it simple! ### 5/5 — Great app! *2011-12-08, version 1.2* Great way to learn what keys are in what chords. Easy to use and intuitive. ### 5/5 — Great app *2011-11-22, version 1.1* Great app and easy to use. I recommend it if you ever need to transpose chords. ## Frequently asked questions about Keys ### What is Keys-Chords? Keys-Chords is a music theory application designed to help users understand the relationship between musical keys and chords. It provides tools for identifying chords within a key and transposing songs to different keys. ### How much does Keys-Chords cost? Keys-Chords is a paid application, available for $1.99. This one-time purchase grants access to all its features without any additional in-app purchases or subscriptions. ### What instruments is Keys-Chords useful for? Keys-Chords is particularly useful for musicians who play instruments capable of playing chords, such as the guitar, piano, and bass. It also aids vocalists in understanding song keys. ### What devices does Keys-Chords support? Keys-Chords is currently supported on iPhone and iPod devices. It is not available for Android or other platforms at this time. ### How often is Keys-Chords updated? The latest version of Keys-Chords is 1.9, which was last updated on November 21, 2016. This indicates infrequent updates in recent years. ### What is the age rating for Keys-Chords? Keys-Chords has an age rating of 4+, making it suitable for a wide range of users interested in music theory. ### Does Keys-Chords have ads? As a paid application, Keys-Chords does not contain advertisements. Users can enjoy the full functionality without interruptions. ### What are the main features of Keys-Chords? Keys-Chords offers a Chord view to identify seven chords in each key (major, minor, diminished) and a Transpose view to help change chords for playing or singing in any major key. ## Version history (last 5 releases) ### 1.9 — 2016-11-21 This app has been updated by Apple to display the Apple Watch app icon. Upgraded for compatibility with iPhone 7. ### 1.8 — 2015-10-13 New - the “Key Signature” is displayed for each Selected key. In addition, the app is upgraded for iOS 9. ### 1.7 — 2014-04-07 Enhanced "Select" button, resolved a display issue, and improved usability on iPhone 3S ### 1.6 — 2013-11-27 Fix a iOS7 bug. In this revision the all the display data will align properly. ### 1.5 — 2012-04-06 Update to run on iOS 5.1 compatible devices. ## Apps similar to Keys | App | Rating | Price | Category | | --- | --- | --- | --- | | [ScaleKnow - Guitar Scales](https://appshunter.io/ios/app/scaleknow-guitar-scales/id1661932701) | — | Free | Music | | [Music Rating](https://appshunter.io/ios/app/music-rating/id1562248093) | 4.0 (3) | Free | Music | | [Bmaj](https://appshunter.io/ios/app/bmaj/id1554524457) | 4.6 (5) | Free | Music | | [GOAT.fm](https://appshunter.io/ios/app/goatfm/id1453800226) | 5.0 (7) | Free | Music | | [Nova Tuner](https://appshunter.io/ios/app/nova-tuner/id1589542148) | 4.7 (26) | $7.99 | Music | | [Chord Builder Guitar](https://appshunter.io/ios/app/chord-builder-guitar/id1468703915) | 4.4 (25) | $1.99 | Music | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*