How well do you know the internet's most famous colors?

Starbucks green isn't green. It's #00704a. Ikea yellow isn't yellow. It's #ffcc00. That # sign isn't a hashtag, but a hex code. It's a way of defining exactly what color you end up seeing.

For brands, color can be equal parts art and science. This tool lets you look up the world's most famous internet brands and see the exact color that defines them.

Don't think internet colors are important? In fact, they're serious business. One of the most famous anecdotes about current Yahoo CEO Marissa Mayer comes from her time at Google. Mayer tested 41 different shades of blue to find the perfect one for Google. That data-driven approach to branding makes it important for companies to make a strong first impression — even with just a color.

See if you can figure out your favorite sites and apps just by glancing at their most important color.

1) #84bd00

#84bd00

That color is used by Spotify.

2) #55acee

#55acee

That color is used by Twitter.

3) #eb2828

#eb2828

That color is used by YouTube.

4) #34465d

#34465d

That color is used by Tumblr.

5) #3b5999

#3b5999

That color is used by Facebook.

6) #cb2028

#cb2028

That color is used by Pinterest.

7) #99cc33

#99cc33

That color is used by Hulu.

8) #ff9900

#ff9900

That color is used by Amazon.

9) #336699

#336699

That color is used by Pandora.

10) #fff200

#fff200

Hopefully, you recognize that color by now.

Thanks to designer Emma Grdina for bringing the tool to our attention.

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