It could just be my computer screen but it looks exactly like Stiffkey which I look at daily. Important to try colors in your own space and pick what is fetching to you.

If stiffkey blue is too light, just have some white pulled out of it when it is mixed. Even though Farrow&Ball's paint comes premixed, our supplier also mixes their paints. They tried this with Benjamin Moore's Polo Blue which is a great navy blue and were able to achieve the black/blue I wanted.

This looks like Inkwell by Sherwin Williams. I painted my office this color.