Automatic Key Recognition

You could try this https://play.riffstation.com/

I'm using a program called Song Surgeon 5. Software is not a bargain but is does the job. There are plenty of feature descriptions on Youtube.

It's great to have apps that will tell you the key of a song, but it's also a crutch that short circuits the learning process.

Here's a suggestion for using a key recognition app to train your ear.

1) Listen to a song and try to hear and feel the tonal center. Hum that note. Maybe try a few different notes that feel strong, and try to evaluate which one feels strongest.

2) Identify the note or notes that feel strongest, using a harmonica, keyboard, or other way of matching up the note(s) you've indentifed with named pitches (C, G, A or whatever). If you're using a harmonica to identify the note, always use Blow 1, as this is the note that matches the key of the harmonica, and will tell you the key of the music, even if you ultimately use a different key of harmonica to play the song.

3) Try using a harmonica in second position to play along. Does it feel like the right fit for the key? (If there's armoncia on the record, they might e playing in another position, such as first or third, so you can't rely on being able to match what they're playing – go by the feel of Draw 2 and Draw 4 against the background of hte recording.)

4) Now run the app and see how well you did. (And remember, apps are not perfect and might make mistakes.)

5) If the app gives a different result from yor ear work, take the note the app indenitifies as the key note, and try humming it against the recording. How does it feel to your ear and body? That's the feel you want to experience when you're looking for the key by ear.