# Key+ > Audio key estimator for musicians and DJs, showing key and relative major/minor. (iPhone/iPad app by Daniel Casady.) - Source: https://appshunter.io/ios/app/key-plus/id582893440 (this page in markdown: same URL + `.md`) - Developer: [Daniel Casady](https://appshunter.io/developer/582893443) - Category: Music, Utilities - Price: $1.99 - Rating: 2.50/5 from 25 App Store ratings · 29 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 4 MB - Languages: American English - Released: 2012-12-10 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/key-plus/id582893440/reviews.md ## What is Key+? Key+ is a handy tool for estimating the musical key of digital recordings and live audio. A must-have for musicians and DJ's, Key+ analyzes audio and returns both the key and it's relative major or minor signature. ## Key features - Estimate musical key - Analyze digital recordings - Analyze live audio - Show relative major/minor signature - Essential for musicians - Useful for DJs ## Recent user reviews (10 of 29) All indexed reviews: https://appshunter.io/ios/app/key-plus/id582893440/reviews.md ### 5/5 — Bugs *2022-09-30, version 2.4* I love this application but I couldn’t open it today. Seems there are some bugs that need to be fixed !! ### 1/5 — Terrible *2019-02-23, version 2.2* After paying 2 dollars for this app, every time it listens to anything it crashes immediately after. Waste of money and time for an app that does nothing. ### 1/5 — Trash *2019-02-16, version 2.2* Worst 2 bucks ever spent! Dont get it wont even read anything, dont waste your time or money ### 1/5 — SCAM *2019-02-02, version 2.2* Nice try Billy McFarland, maybe try making an app that doesn’t crash immediately after analyzing a song. @itunes can we delete this trash from the App Store. Thank You ### 1/5 — Crashes Galore *2019-01-17, version 2.2* For a paid app, I would expect maintenance to be regularly updated. This app not only had views that say that it isn’t accurate, but it crashes immediately after listening for me. All in all, this is the worst 2 dollars I’ve ever spent. ### 1/5 — Doesnt work *2019-01-15, version 2.2* Closes every time I try to find the key ### 1/5 — Crashes every time. *2018-12-01, version 2.2* Easy to use... 1 Star. After listening for 15, 30 seconds - counter increasing to 100%, app goes blank. Never displays a key... just returns to the screen of icons. ### 5/5 — Nice *2018-09-15, version 2.2* I am a Audio engineer and every sense I ran across this app it have been a time saver for me for when I am recoding singers who need the auto tune in the right key. This app help me with the key that the song are in so I can set the key and note scale so the auto tune can correct the singer notes. This help me with hearing the key without using it but I still use this app to make sure. ### 1/5 — Doesn’t work *2018-08-12, version 2.2* Very very inaccurate, waste of money ### 1/5 — Complete waste of money *2018-01-13, version 2.2* Doesn’t matter what song you try, everything is in Bm. Gee! Who knew?? Certainly simplifies things :( ## Frequently asked questions about Key+ ### What does the Key+ app do? Key+ is designed to estimate the musical key of audio. It can analyze both digital recordings and live audio input. The app provides the identified key along with its corresponding relative major or minor signature. ### Who is Key+ for? This application is a valuable tool for musicians and DJs. Anyone who needs to quickly determine the musical key of a song or audio source will find it useful. ### Is Key+ free to use? Yes, based on the provided information, Key+ is available for free. There are no mentions of subscription fees or paid versions. ### What kind of audio can Key+ analyze? Key+ can analyze digital audio recordings, such as music files. It can also analyze live audio input, making it versatile for various musical contexts. ## Version history (last 5 releases) ### 2.4 — 2019-02-24 *Fixed access to microphone. Sorry! ### 2.3 — 2019-02-23 *Fixed access to music library. Sorry! ### 2.2 — 2015-01-04 *Updated UI ### 2.1 — 2014-07-05 *Updated UI for larger iPhone 5 and 5s displays *Improved key detection algorithm accuracy *Display the individual notes of the key result scale *Miscellaneous improvements ### 2.0 — 2013-01-08 *Miscellaneous bug fixes and enhancements *Added archive for saved key results ## Apps similar to Key+ | App | Rating | Price | Category | | --- | --- | --- | --- | | [Percuss — Rhythm Sequencer](https://appshunter.io/ios/app/percuss-rhythm-sequencer/id1520051881) | 5.0 (1) | $2.99 | Music | | [KeyFinder](https://appshunter.io/ios/app/keyfinder/id301281917) | 2.7 (322) | Free | Music | | ['nome](https://appshunter.io/ios/app/nome/id1435416999) | 4.6 (9) | Free | Music | | [SynthJacker](https://appshunter.io/ios/app/synthjacker/id1445018791) | 4.4 (22) | $8.99 | Music | | [STEPS - MIDI Sequencer](https://appshunter.io/ios/app/steps-midi-sequencer/id1224149283) | 3.9 (13) | $0.99 | Music | | [Studio Monitor](https://appshunter.io/ios/app/studio-monitor/id1539826124) | 5.0 (1) | Free | 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.*