HoRNet SongKey MK3

Realtime chord, tempo and key finder plugin

HoRNet SongKey MK3 screenshot

HoRNet SongKey MK3 is the all new third version of our key finder plugin, but it doesn’t do simple key recognition, it’s also capable of detect the chord being played and the song tempo. We thought it was a good idea to also add MIDI input (to be able to detect chords and key of midi tracks) and MIDI output for the recognised chords so you can record them and edit the track for your own needs.

At the core of SongKey we find the “chromagram” (a level representation of the intensity of each note playing in the song) but we spent a lot of time creating a more reliable and cleaner chromagram than the one of the previous version.

The data extracted from the audio is used to feed an artificial intelligence unit that is used to detect each chord, and SongKey MK3’s chord detection extends to sevenths, fifths and suspended chords.

The new key detection engine builds on the chromagram and expands it with another unit based around a statistical chord progression model that analysing the chord sequence is able to understand the key of the song, this has the great advantage that the key recognition is always realtime so you can change song without the need to reset the plugin, or if the song changes key in some part of it, the plugin will simply be able to detect the new chord sequence and follow the key change.

The all new GUI is completely vector drawn and resizable, so it’ll look good on any screen and can be made smaller or bigger as needed.

SongKey is very useful in those situation in which you don’t have an instrument at hand to find out the key of a song you are working on or if you are a DJ and want to make a mash up but you don’t know in which key a song is written. The chord detection feature gives you insights on the chord progression of the song so that you can better design your bass lines and pads.


We decided to not provide a demo for SongKey MK3 because we don’t want to to cripple our product too much and limiting the capability of this plugin for a demo would mean to provide a bad testing experience.

For this reason we offer an instantaneous full refund within 15 days of your purchase if you buy SongKey MK3 and you don’t like it


  • Artificial Intelligence driven key identification that follow key changes
  • Realtime audio and MIDI chord detection
  • Confidence display for each found key
  • Key and Chord chromagram that shows each note level
  • Sample mode for short sounds analysis
  • Realtime tempo detection
  • MIDI output of detected chords
  • Sharp and Flat notation
  • Resizable vector GUI
  • Mac OS X (>=10.7) and Windows support.
  • 64-bit compatibility both on Mac and Windows.
  • Audio Units VST2.4, VST3  and AAX format.

Video Overview


Copy protection

The HoRNet SongKey MK3 has no copy protection, we don’t believe in copy protection, they are always cracked and they are annoying for the users, we all know you are not going to give away the plugin on the internet…

So simply download the plugin and enjoy your recordings!

25 thoughts on “HoRNet SongKey MK3


If I enable this plugin, cubase lags so much! Freezing a lot of times. :/
I have not problem with MK2. But with MK3 I am freezing all the time :/
I don't know if this happen because of the plugin or because my computer so I will rate with 5 stars because this version is very helpful.

Praxis Music says:

I was really excited to see a new version of this plugin came out, because I really want a key detection plugin for my Ableton Live sets.
Having a plugin like this would make improv sets really easy.
But, I was disappointed that It doesn't even work in very low buffer rates, as it takes a HUGE amount of CPU, making live improv sets impossible when using audio this plugin.
But, when I changed my buffer rate to 512 samples, and it worked, the plugin did not even get the key of my track correct, and it couldn't count the tempo well, either.

Now, all that being said, I really want this plugin to work.
I LOVE the idea of this plugin, and it would be EXTREMELY helpful to me, if it worked. I'm still keeping my eye on this plugin for fixes.

fred says:

nice and usefull plugin. works with reason 10. One small minor, it's a bit cpu hungry. So check the notes and than disable the plugin if all is in tune.

Joseph Sorensen says:

This was an absolute instant buy. There is nothing else on the market that does this type of harmonic/pitch detection as well as HoRNet – and I'm dumbfounded at the price-tag being so low.

Sami Tahrraoui says:

Bought this when ZDS (Zombie Disco Squad) recommended it in his Faderpro tutorials. Tested it myself to see if the detection was accurate and very happy it does. Lifesaver!

rocky098 says:

not match BPM

I want to download this program, it helps me to produce good music

Ray LaManna says:

I rarely write reveiws but, this is an awesome plugin! I have about 15 yrs of production and mixing experience. I am the Hip Hop Production professor at Austin Community College. I use Cubase 10.0.2 and Songkey MK3 without any issues. I'm not having latency issues, and the cpu usage is minimal.
Pros : The plugin reads the Key and Chords of single instruments very well. For example, a rhodes piano. However, it struggles to read loops with multiple instruments playing different notes. There could be a number of reasons relating to theory why this is happening.
Cons: The BPM is not accurate at all. Luckily Cubase has a BPM calculator.
All in all this is an excellent plugin at an amazing price!

Kijan says:

Bought it and disliked it. The note-detection is simply useless and what's worth is that I am now waiting for 2 weeks that hornet plugins even replies to my request to refund me. Cannot recommend

Robert Hutchins says:

I rarely write reviews but, I am very disappointed that HorNet has not corrected an on going issue since (05/21/19) the release of the new SongKey MK3 plugin. The plugin is unusable for me due to an issue that cause Cubase Pro to blacklist it when I try to reinstate the plugin as recommended by HorNet support the plugin crashes both Cubase Pro 10.0.20 and 9.5.41. I cannot recommend buying this plugin at this time due to bon going issue.

Bilaal Porter says:

I want to like this plugin, but I cannot use it in Ableton Live 10.1 because it crashes immediately on start-up. I've tried to use it in Maschine, but it does not even show up on my plugins list. I downloaded the Songkey MK3 3.0.1 "update but Ableton still crashes, I have to deactivate the plugin in order to use my DAW. I have cleared, caches, re-installed Ableton Live, and it still does not work. I used Songkey MK2 before, and had no problems with it, I just want MK3 to work! I cannot believe that I purchased a pluginMay 2019 that is still unusable as I write this (July 2019). I am very disappointed that more has not been done to resolve this issue; there are others who are having the same issues, HoRNet has great plugins- I just cannot recommend Songkey MK3 to anyone at this time until it is fully fixed!

Lukasz Olejarczyk says:

not recognise chords at all

Fabio Lenzi says:

Nice, but isn't a professional Plugin. Works not perfectly. Good for average bpm and keys.

chris moon says:

Latest version 3.3 crashes latest version of Protools on Windows every time – cannot get it to load or work – need it, want it … can't get it to run, ever.

john Patton IV says:

Latest update 3.0.3 renders FL Studio 20.5 useless. Toggling settings within plugin makes it functional again but it was before update without modifying anything. Leaving 4 stars because plugin is hit or miss with key detection and BPM is never accurate but otherwise very useful, better window scaling has been implemented, and of course a great price. Still would recommend to a buddy especially at a even better price than usual!! Patiently waiting on 3.0.4!!!!

YaRule says:

its great for vocals

William says:

Excelente plugin

Abel Serra says:

Now works perfectly. Great pluggin!!

manh says:

Great tool to help me write music from my acapella!!!

Hans says:

Accuracy is the most important part here. There are natural limits in organically played music, but consider to check segments and instrumental stems individually!

Also, to me very important, this plugin should detect the tuning relative to A440 with highest precision. Perhaps build some average, and exclude obvious pitch bends and vibratos in playing by the instrumentalist, or by the singer.
It should exactly tell, if some piano or guitar part is +37 cent or anything.

ziryab says:

indice de aciertos bastante bajo, falla mucho en mi opinion, deberian mejorar AI

hhhhhhh says:

you can do trial instead of demo too easy wooooooooooow

craig violette says:

i bought this hoping that i would be able to see what key samples are in for my MPC software because their is not a tuner and installed to what the word document said for pc that's what i own and tried to open it and it wont even show the whole window it just shows half of the cords part and nothing else cant expand it or shrink it in and i will say i probably will not be buying any more of you plug ins

Diego says:

Gran plugin

Michel Mischke says:

Doesnt work at all, it cant tell you either the key nor the bpm…. doesnt even sees a difference between major and minor…. i hope there will be some updates, but if you read this, better dont buy it!

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