A web-based service that transcribes chords from YouTube, SoundCloud, or your own files. The basic version is free.
If you aren't ready to buy a key yet, there are several free or "freemium" alternatives that can help you find chords:
A leaked registration key usually gets blacklisted by the developers. Once this happens, you won't be able to update the software to newer versions (like 3.0 and beyond), which often include improved chord-detection algorithms. How to Get a Valid Registration Key
Here is everything you need to know about Chord Pickout 3.0, the risks of using unauthorized keys, and how you can actually get the software working for your music projects. What is Chord Pickout 3.0?
Pirated versions of Chord Pickout are frequently unstable. They may crash during a transcription or fail to recognize complex chords accurately.