App for chord and scale creation or diagramming

Somewhere in beginner grade 1 or 2, Justin verbally mentioned on the video an app he recommended for making scale and chord sheets, creating or diagramming. Naturally I wrote it down and promptly lost the paper. I think it might be Mustud but I’m not sure and it doesn’t have a free trial.

Does anyone remember what this app was called?

Thanks,
Don

Neck Diagrams 2.

Windows and Mac only I believe. Been using it on my PC for a number of years.

https://www.neckdiagrams.com/

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Oh, and interesting, Justin even gave them a review:
https://www.neckdiagrams.com/reviews/

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That’s the one, thank you both so much. Don

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