Closest hex to #9900ff is #90f

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#90f

9900ff

9900ff

contains 90

090 190 290 390 490 590 690 790 890 900 901 902 903 904 905 906 907 908 909 90a 90b 90c 90d 90e 90f 990 a90 b90 c90 d90 e90 f90

contains 0f

00f 0f0 0f1 0f2 0f3 0f4 0f5 0f6 0f7 0f8 0f9 0fa 0fb 0fc 0fd 0fe 0ff 10f 20f 30f 40f 50f 60f 70f 80f 90f a0f b0f c0f d0f e0f f0f

contains 9f

09f 19f 29f 39f 49f 59f 69f 79f 89f 99f 9f0 9f1 9f2 9f3 9f4 9f5 9f6 9f7 9f8 9f9 9fa 9fb 9fc 9fd 9fe 9ff a9f b9f c9f d9f e9f f9f