Mixed In Key is the desktop application most DJs reach for first when they want to know the musical key and BPM of their tracks. It is mature, accurate, and widely respected. It also costs $58 for the basic version and runs only on Windows and macOS. If you have searched "mixed in key free" you have probably already discovered that there is no official free version — just a free trial.
This guide covers what people actually mean when they search "mixed in key free", the legitimate free alternatives that exist, and how each one compares to Mixed In Key for different use cases.
What You Are Probably Looking For
Searches for "mixed in key free" tend to fall into one of three categories:
- A free version of Mixed In Key itself — A piracy concern, but also a reasonable wish if you only need basic key detection occasionally.
- An alternative tool that does the same thing for free — Open-source software, freemium SaaS, or a web tool that reads track metadata.
- A way to find the key of one specific track without buying anything — You have a track in mind, you want to know its key and BPM, and you do not want to install software for a one-off lookup.
The right answer depends entirely on which of these you are. We will go through each.
Why Mixed In Key Itself Has No Free Version
Mixed In Key analyses audio files on your hard drive using their own algorithm and the Camelot wheel notation system. The team has invested years of development into the accuracy of their detection. They offer a free trial that limits how many tracks you can analyse, but no permanent free tier. Pirated versions exist but are unsafe and unsupported.
If you genuinely need to analyse a large local library — say 1,000+ tracks you own — Mixed In Key remains the standard tool for a reason. The $58 cost is recoverable in a single weekend if you are gigging. For occasional use, the alternatives below are better.
Free Alternative 1: Use Spotify's Built-In Audio Features
Spotify exposes BPM, musical key, energy, and danceability for tracks in their catalogue through their public API. The data is generated by Spotify's own audio analysis and is reasonably accurate for the genres most DJs care about.
The catch is that getting this data normally requires API access and code. TrackRadar's free BPM and key finder wraps this for a track you can find on Spotify — type the artist and title, get back BPM, key (in both standard notation and Camelot), energy, and platform links. No API key needed, no software install.
This works well when:
- The track exists on Spotify (which covers most released music).
- You only need the data for a handful of tracks at a time.
- You want Camelot notation for harmonic mixing.
It does not work when:
- The track is unreleased, vinyl-only, or Bandcamp-exclusive.
- You need to analyse your local audio files directly (Spotify analyses the master, not your file).
- You need batch analysis of hundreds of tracks at once.
Free Alternative 2: Mixxx
Mixxx is open-source DJ software that runs on Windows, macOS, and Linux. It includes built-in key and BPM detection that analyses audio files on your hard drive — exactly the thing Mixed In Key is known for. The detection is not as polished as Mixed In Key, but it is genuinely free, open source, and good enough for most working DJs.
Best for: DJs who want to analyse a local audio library without paying anything, and who do not mind installing a full DJ application to do it.
Limitation: Mixxx's key detection accuracy varies by genre. It works well for house and techno where the key is stable through the track, less well for music with frequent key changes or atonal elements.
Free Alternative 3: KeyFinder
KeyFinder is a small, focused open-source app whose only job is to analyse the key of audio files. It does not do BPM, it does not do anything else — just musical key detection. Available for macOS and Windows.
Best for: Someone who already has a BPM detection method (most DJ software shows BPM automatically) and only needs key analysis. The simplicity is the point — install, drag files in, write key tags to file metadata.
Limitation: No BPM, no batch features, no Camelot conversion by default.
Free Alternative 4: Tunebat
Tunebat is a free web tool that lets you search tracks by name and returns BPM, key, Camelot notation, energy, and other audio features. The data comes from the same Spotify Audio Features API that TrackRadar's BPM and Key Finder uses, so the underlying accuracy is comparable.
Tunebat has been around longer and has a larger user base. TrackRadar's tool is more recent and is integrated with the broader track identification workflow — if you found a track from a DJ set you might already be in TrackRadar, and the BPM and key lookup is one click away rather than a separate site.
Both are good choices for "what is the BPM and key of this one track".
Free Alternative 5: rekordbox Free Tier
Pioneer DJ's rekordbox has a free tier that includes basic track analysis, which generates BPM and key for tracks in your library. It is full DJ software with hardware integration, which is overkill if you only want key detection, but free is free.
Best for: People who are likely to use Pioneer CDJs anyway and want their library prepped in the same software they will perform with.
How TrackRadar Fits Into This
TrackRadar is not a Mixed In Key replacement. Mixed In Key analyses local audio files — TrackRadar identifies tracks from social media posts and then looks up BPM and key from Spotify's data on the matched track.
The combination is useful if your workflow looks like this:
- You hear a track in an Instagram Reel or SoundCloud mix and want to know what it is. Use the Song from Reel tool or paste a SoundCloud URL into the SoundCloud Tracklist Extractor.
- Once you have the track identified, you want to know if it fits your set. Look up the BPM and key with the BPM and Key Finder.
- You want to find compatible tracks for harmonic mixing. Use the Similar Songs Finder to surface tracks with matching BPM and key from Spotify's recommendation graph.
- You want to learn the Camelot system properly. The interactive Camelot wheel shows which keys mix harmonically.
This is a different workflow than analysing a local library. If you already have 5,000 tracks on your hard drive, Mixed In Key or Mixxx is still your tool. If you are building a library by finding tracks online first, TrackRadar handles the discovery-to-key pipeline in one place.
Recommendation by Use Case
- You have a large local library and want batch key detection: Mixxx (free) or Mixed In Key ($58). Pay if you can afford it — the accuracy gap matters at scale.
- You want to look up the key of one specific track: TrackRadar's BPM and Key Finder or Tunebat. Both free, both backed by Spotify data, both fast.
- You are using Pioneer CDJs: rekordbox free tier. Same software you will perform with, so the prep transfers directly.
- You only need key, not BPM: KeyFinder. Smallest, most focused tool.
- You are discovering tracks from social media: Find them with TrackRadar, then look up BPM and key in the same flow. No file imports needed.
A Note on Accuracy
No automated key detection is perfect. Mixed In Key, Mixxx, KeyFinder, and Spotify Audio Features all use different algorithms and will sometimes disagree on the same track. This matters less than it sounds — even if a detection is off by one key, the Camelot wheel gives you several compatible options, and your ear is the final judge.
If you are mixing live and a transition does not feel right, trust your ear over the detected key. The tools are a starting point, not a verdict.
Get Started
For most people who land on this page, the fastest path to what they need is the free BPM and Key Finder. Type any artist and track title, get BPM and key for free in under five seconds.
If you are coming from a track discovery workflow — you heard something in a Reel or a mix and want to know both what it is and what key it is in — start with the Reel analysis or SoundCloud extractor instead. TrackRadar will identify the track and link out to all the platform data, including the BPM and key lookup.