Contents

Introduction

The purpose of this page is to display luminosity contrast ratios for all web safe colours against a web safe background colour. The results are shown in a table that also includes the difference in brightness, and the difference in colour that are used by the colour contrast analyser for comparison. To test the luminosity contrast ratio for any colour combination, use the luminosity contrast ratio analyser.

The following icons are used in the results to indicate whether or not the result of a calculation is a pass.

Key for the Icons
Icon Meaning
Fail Indicates the value shown is a failure.
Pass Indicates the value shown is a pass.
Level AA Indicates that the luminosity contrast ratio is a level AA pass for large text (at least 18 point or 14 point bold)
Level AAA Indicates that the luminosity contrast ratio is a level AAA pass for large text (at least 18 point or 14 point bold)
Level AA Indicates that the luminosity contrast ratio is a level AA pass for regular text.
Level AAA Indicates that the luminosity contrast ratio is a level AAA pass for regular text.

Luminosity Contrast Ratios for #663

The following table shows the luminosity contrast ratios for all web safe colours with a background colour of #663, along with the difference in brightness and the difference in colour used by the colour contrast analyser for comparison.

Luminosity Ratios with background: #663
Foreground Colour Sample Luminosity Contrast Ratio Difference in Brightness Difference in Colour
#000 Sample Pass Level AA for large text3.51
Fail fo regular text
Fail 96 Fail 255
#003 Sample Pass Level AA for large text3.35
Fail fo regular text
Fail 90 Fail 204
#006 Sample Fail2.95
Fail
Fail 84 Fail 255
#009 Sample Fail2.41
Fail
Fail 78 Fail 306
#00c Sample Fail1.88
Fail
Fail 72 Fail 357
#00f Sample Fail1.44
Fail
Fail 67 Fail 408
#030 Sample Fail2.38
Fail
Fail 66 Fail 204
#033 Sample Fail2.31
Fail
Fail 60 Fail 153
#036 Sample Fail2.11
Fail
Fail 54 Fail 204
#039 Sample Fail1.82
Fail
Fail 48 Fail 255
#03c Sample Fail1.50
Fail
Fail 42 Fail 306
#03f Sample Fail1.20
Fail
Fail 37 Fail 357
#060 Sample Fail1.21
Fail
Fail 36 Fail 153
#063 Sample Fail1.19
Fail
Fail 30 Fail 102
#066 Sample Fail1.14
Fail
Fail 24 Fail 153
#069 Sample Fail1.05
Fail
Fail 18 Fail 204
#06c Sample Fail1.07
Fail
Fail 13 Fail 255
#06f Sample Fail1.24
Fail
Fail 7 Fail 306
#090 Sample Fail1.58
Fail
Fail 6 Fail 204
#093 Sample Fail1.60
Fail
Fail 0 Fail 153
#096 Sample Fail1.64
Fail
Fail 5 Fail 204
#099 Sample Fail1.71
Fail
Fail 11 Fail 255
#09c Sample Fail1.83
Fail
Fail 16 Fail 306
#09f Sample Fail1.99
Fail
Fail 22 Fail 357
#0c0 Sample Fail2.74
Fail
Fail 23 Fail 255
#0c3 Sample Fail2.76
Fail
Fail 29 Fail 204
#0c6 Sample Fail2.80
Fail
Fail 35 Fail 255
#0c9 Sample Fail2.87
Fail
Fail 41 Fail 306
#0cc Sample Fail2.99
Fail
Fail 46 Fail 357
#0cf Sample Pass Level AA for large text3.15
Fail fo regular text
Fail 52 Fail 408
#0f0 Sample Pass Level AA for large text4.36
Fail fo regular text
Fail 53 Fail 306
#0f3 Sample Pass Level AA for large text4.37
Fail fo regular text
Fail 59 Fail 255
#0f6 Sample Pass Level AA for large text4.41
Fail fo regular text
Fail 65 Fail 306
#0f9 Sample Pass Level AA for large text4.49
Fail fo regular text
Fail 70 Fail 357
#0fc Sample Pass Level AAA for large text4.60
Pass level 2 fo regular text
Fail 76 Fail 408
#0ff Sample Pass Level AAA for large text4.77
Pass level 2 fo regular text
Fail 82 Fail 459
#300 Sample Pass Level AA for large text3.08
Fail fo regular text
Fail 80 Fail 204
#303 Sample Fail2.96
Fail
Fail 75 Fail 153
#306 Sample Fail2.64
Fail
Fail 69 Fail 204
#309 Sample Fail2.19
Fail
Fail 63 Fail 255
#30c Sample Fail1.75
Fail
Fail 57 Fail 306
#30f Sample Fail1.36
Fail
Fail 51 Fail 357
#330 Sample Fail2.18
Fail
Fail 51 Fail 153
#333 Sample Fail2.11
Fail
Fail 45 Fail 102
#336 Sample Fail1.95
Fail
Fail 39 Fail 153
#339 Sample Fail1.69
Fail
Fail 33 Fail 204
#33c Sample Fail1.41
Fail
Fail 27 Fail 255
#33f Sample Fail1.15
Fail
Fail 21 Fail 306
#360 Sample Fail1.16
Fail
Fail 21 Fail 102
#363 Sample Fail1.14
Fail
Fail 15 Fail 51
#366 Sample Fail1.09
Fail
Fail 9 Fail 102
#369 Sample Fail1.00
Fail
Fail 3 Fail 153
#36c Sample Fail1.11
Fail
Fail 2 Fail 204
#36f Sample Fail1.28
Fail
Fail 8 Fail 255
#390 Sample Fail1.62
Fail
Fail 8 Fail 153
#393 Sample Fail1.64
Fail
Fail 14 Fail 102
#396 Sample Fail1.68
Fail
Fail 20 Fail 153
#399 Sample Fail1.75
Fail
Fail 26 Fail 204
#39c Sample Fail1.87
Fail
Fail 32 Fail 255
#39f Sample Fail2.03
Fail
Fail 37 Fail 306
#3c0 Sample Fail2.78
Fail
Fail 38 Fail 204
#3c3 Sample Fail2.80
Fail
Fail 44 Fail 153
#3c6 Sample Fail2.84
Fail
Fail 50 Fail 204
#3c9 Sample Fail2.91
Fail
Fail 56 Fail 255
#3cc Sample Pass Level AA for large text3.03
Fail fo regular text
Fail 62 Fail 306
#3cf Sample Pass Level AA for large text3.19
Fail fo regular text
Fail 67 Fail 357
#3f0 Sample Pass Level AA for large text4.40
Fail fo regular text
Fail 68 Fail 255
#3f3 Sample Pass Level AA for large text4.41
Fail fo regular text
Fail 74 Fail 204
#3f6 Sample Pass Level AA for large text4.45
Fail fo regular text
Fail 80 Fail 255
#3f9 Sample Pass Level AAA for large text4.53
Pass level 2 fo regular text
Fail 86 Fail 306
#3fc Sample Pass Level AAA for large text4.64
Pass level 2 fo regular text
Fail 92 Fail 357
#3ff Sample Pass Level AAA for large text4.81
Pass level 2 fo regular text
Fail 97 Fail 408
#600 Sample Fail2.24
Fail
Fail 65 Fail 153
#603 Sample Fail2.18
Fail
Fail 59 Fail 102
#606 Sample Fail2.00
Fail
Fail 54 Fail 153
#609 Sample Fail1.74
Fail
Fail 48 Fail 204
#60c Sample Fail1.44
Fail
Fail 42 Fail 255
#60f Sample Fail1.17
Fail
Fail 36 Fail 306
#630 Sample Fail1.72
Fail
Fail 35 Fail 102
#633 Sample Fail1.68
Fail
Fail 29 Fail 51
#636 Sample Fail1.58
Fail
Fail 24 Fail 102
#639 Sample Fail1.41
Fail
Fail 18 Fail 153
#63c Sample Fail1.21
Fail
Fail 12 Fail 204
#63f Sample Fail1.01
Fail
Fail 6 Fail 255
#660 Sample Fail1.01
Fail
Fail 5 Fail 51
#663 Sample Fail1.00
Fail
Fail 0 Fail 0
#666 Sample Fail1.04
Fail
Fail 5 Fail 51
#669 Sample Fail1.12
Fail
Fail 11 Fail 102
#66c Sample Fail1.23
Fail
Fail 17 Fail 153
#66f Sample Fail1.40
Fail
Fail 23 Fail 204
#690 Sample Fail1.74
Fail
Fail 24 Fail 102
#693 Sample Fail1.76
Fail
Fail 29 Fail 51
#696 Sample Fail1.80
Fail
Fail 35 Fail 102
#699 Sample Fail1.87
Fail
Fail 41 Fail 153
#69c Sample Fail1.99
Fail
Fail 47 Fail 204
#69f Sample Fail2.15
Fail
Fail 53 Fail 255
#6c0 Sample Fail2.90
Fail
Fail 54 Fail 153
#6c3 Sample Fail2.92
Fail
Fail 59 Fail 102
#6c6 Sample Fail2.96
Fail
Fail 65 Fail 153
#6c9 Sample Pass Level AA for large text3.03
Fail fo regular text
Fail 71 Fail 204
#6cc Sample Pass Level AA for large text3.15
Fail fo regular text
Fail 77 Fail 255
#6cf Sample Pass Level AA for large text3.31
Fail fo regular text
Fail 83 Fail 306
#6f0 Sample Pass Level AAA for large text4.52
Pass level 2 fo regular text
Fail 83 Fail 204
#6f3 Sample Pass Level AAA for large text4.53
Pass level 2 fo regular text
Fail 89 Fail 153
#6f6 Sample Pass Level AAA for large text4.57
Pass level 2 fo regular text
Fail 95 Fail 204
#6f9 Sample Pass Level AAA for large text4.65
Pass level 2 fo regular text
Fail 101 Fail 255
#6fc Sample Pass Level AAA for large text4.76
Pass level 2 fo regular text
Fail 107 Fail 306
#6ff Sample Pass Level AAA for large text4.93
Pass level 2 fo regular text
Fail 113 Fail 357
#900 Sample Fail1.49
Fail
Fail 50 Fail 204
#903 Sample Fail1.46
Fail
Fail 44 Fail 153
#906 Sample Fail1.38
Fail
Fail 38 Fail 204
#909 Sample Fail1.25
Fail
Fail 32 Fail 255
#90c Sample Fail1.09
Fail
Fail 27 Fail 306
#90f Sample Fail1.08
Fail
Fail 21 Fail 357
#930 Sample Fail1.24
Fail
Fail 20 Fail 153
#933 Sample Fail1.22
Fail
Fail 14 Fail 102
#936 Sample Fail1.16
Fail
Fail 8 Fail 153
#939 Sample Fail1.07
Fail
Fail 3 Fail 204
#93c Sample Fail1.05
Fail
Fail 2 Fail 255
#93f Sample Fail1.22
Fail
Fail 8 Fail 306
#960 Sample Fail1.21
Fail
Fail 9 Fail 102
#963 Sample Fail1.22
Fail
Fail 15 Fail 51
#966 Sample Fail1.27
Fail
Fail 21 Fail 102
#969 Sample Fail1.34
Fail
Fail 26 Fail 153
#96c Sample Fail1.46
Fail
Fail 32 Fail 204
#96f Sample Fail1.62
Fail
Fail 38 Fail 255
#990 Sample Fail1.97
Fail
Fail 39 Fail 153
#993 Sample Fail1.98
Fail
Fail 45 Fail 102
#996 Sample Fail2.02
Fail
Fail 51 Fail 153
#999 Sample Fail2.10
Fail
Fail 56 Fail 204
#99c Sample Fail2.22
Fail
Fail 62 Fail 255
#99f Sample Fail2.38
Fail
Fail 68 Fail 306
#9c0 Sample Pass Level AA for large text3.13
Fail fo regular text
Fail 69 Fail 204
#9c3 Sample Pass Level AA for large text3.14
Fail fo regular text
Fail 75 Fail 153
#9c6 Sample Pass Level AA for large text3.18
Fail fo regular text
Fail 80 Fail 204
#9c9 Sample Pass Level AA for large text3.26
Fail fo regular text
Fail 86 Fail 255
#9cc Sample Pass Level AA for large text3.38
Fail fo regular text
Fail 92 Fail 306
#9cf Sample Pass Level AA for large text3.54
Fail fo regular text
Fail 98 Fail 357
#9f0 Sample Pass Level AAA for large text4.74
Pass level 2 fo regular text
Fail 99 Fail 255
#9f3 Sample Pass Level AAA for large text4.76
Pass level 2 fo regular text
Fail 105 Fail 204
#9f6 Sample Pass Level AAA for large text4.80
Pass level 2 fo regular text
Fail 110 Fail 255
#9f9 Sample Pass Level AAA for large text4.87
Pass level 2 fo regular text
Fail 116 Fail 306
#9fc Sample Pass Level AAA for large text4.99
Pass level 2 fo regular text
Fail 122 Fail 357
#9ff Sample Pass Level AAA for large text5.15
Pass level 2 fo regular text
Pass 128 Fail 408
#c00 Sample Fail1.02
Fail
Fail 35 Fail 255
#c03 Sample Fail1.03
Fail
Fail 29 Fail 204
#c06 Sample Fail1.07
Fail
Fail 23 Fail 255
#c09 Sample Fail1.15
Fail
Fail 17 Fail 306
#c0c Sample Fail1.26
Fail
Fail 11 Fail 357
#c0f Sample Fail1.43
Fail
Fail 6 Fail 408
#c30 Sample Fail1.15
Fail
Fail 5 Fail 204
#c33 Sample Fail1.16
Fail
Fail 0 Fail 153
#c36 Sample Fail1.20
Fail
Fail 6 Fail 204
#c39 Sample Fail1.28
Fail
Fail 12 Fail 255
#c3c Sample Fail1.40
Fail
Fail 18 Fail 306
#c3f Sample Fail1.56
Fail
Fail 23 Fail 357
#c60 Sample Fail1.56
Fail
Fail 24 Fail 153
#c63 Sample Fail1.57
Fail
Fail 30 Fail 102
#c66 Sample Fail1.61
Fail
Fail 36 Fail 153
#c69 Sample Fail1.69
Fail
Fail 42 Fail 204
#c6c Sample Fail1.80
Fail
Fail 47 Fail 255
#c6f Sample Fail1.97
Fail
Fail 53 Fail 306
#c90 Sample Fail2.31
Fail
Fail 54 Fail 204
#c93 Sample Fail2.33
Fail
Fail 60 Fail 153
#c96 Sample Fail2.37
Fail
Fail 66 Fail 204
#c99 Sample Fail2.44
Fail
Fail 72 Fail 255
#c9c Sample Fail2.56
Fail
Fail 77 Fail 306
#c9f Sample Fail2.72
Fail
Fail 83 Fail 357
#cc0 Sample Pass Level AA for large text3.47
Fail fo regular text
Fail 84 Fail 255
#cc3 Sample Pass Level AA for large text3.49
Fail fo regular text
Fail 90 Fail 204
#cc6 Sample Pass Level AA for large text3.53
Fail fo regular text
Fail 96 Fail 255
#cc9 Sample Pass Level AA for large text3.60
Fail fo regular text
Fail 102 Fail 306
#ccc Sample Pass Level AA for large text3.72
Fail fo regular text
Fail 107 Fail 357
#ccf Sample Pass Level AA for large text3.88
Fail fo regular text
Fail 113 Fail 408
#cf0 Sample Pass Level AAA for large text5.09
Pass level 2 fo regular text
Fail 114 Fail 306
#cf3 Sample Pass Level AAA for large text5.10
Pass level 2 fo regular text
Fail 120 Fail 255
#cf6 Sample Pass Level AAA for large text5.14
Pass level 2 fo regular text
Pass 126 Fail 306
#cf9 Sample Pass Level AAA for large text5.22
Pass level 2 fo regular text
Pass 131 Fail 357
#cfc Sample Pass Level AAA for large text5.33
Pass level 2 fo regular text
Pass 137 Fail 408
#cff Sample Pass Level AAA for large text5.50
Pass level 2 fo regular text
Pass 143 Fail 459
#f00 Sample Fail1.49
Fail
Fail 19 Fail 306
#f03 Sample Fail1.51
Fail
Fail 14 Fail 255
#f06 Sample Fail1.55
Fail
Fail 8 Fail 306
#f09 Sample Fail1.63
Fail
Fail 2 Fail 357
#f0c Sample Fail1.74
Fail
Fail 3 Fail 408
#f0f Sample Fail1.91
Fail
Fail 9 Fail 459
#f30 Sample Fail1.63
Fail
Fail 9 Fail 255
#f33 Sample Fail1.64
Fail
Fail 15 Fail 204
#f36 Sample Fail1.68
Fail
Fail 21 Fail 255
#f39 Sample Fail1.76
Fail
Fail 27 Fail 306
#f3c Sample Fail1.88
Fail
Fail 33 Fail 357
#f3f Sample Fail2.04
Fail
Fail 39 Fail 408
#f60 Sample Fail2.04
Fail
Fail 39 Fail 204
#f63 Sample Fail2.05
Fail
Fail 45 Fail 153
#f66 Sample Fail2.09
Fail
Fail 51 Fail 204
#f69 Sample Fail2.17
Fail
Fail 57 Fail 255
#f6c Sample Fail2.28
Fail
Fail 63 Fail 306
#f6f Sample Fail2.45
Fail
Fail 69 Fail 357
#f90 Sample Fail2.79
Fail
Fail 69 Fail 255
#f93 Sample Fail2.81
Fail
Fail 75 Fail 204
#f96 Sample Fail2.85
Fail
Fail 81 Fail 255
#f99 Sample Fail2.92
Fail
Fail 87 Fail 306
#f9c Sample Pass Level AA for large text3.04
Fail fo regular text
Fail 93 Fail 357
#f9f Sample Pass Level AA for large text3.20
Fail fo regular text
Fail 98 Fail 408
#fc0 Sample Pass Level AA for large text3.95
Fail fo regular text
Fail 99 Fail 306
#fc3 Sample Pass Level AA for large text3.97
Fail fo regular text
Fail 105 Fail 255
#fc6 Sample Pass Level AA for large text4.01
Fail fo regular text
Fail 111 Fail 306
#fc9 Sample Pass Level AA for large text4.08
Fail fo regular text
Fail 117 Fail 357
#fcc Sample Pass Level AA for large text4.20
Fail fo regular text
Fail 123 Fail 408
#fcf Sample Pass Level AA for large text4.36
Fail fo regular text
Pass 128 Fail 459
#ff0 Sample Pass Level AAA for large text5.57
Pass level 2 fo regular text
Pass 129 Fail 357
#ff3 Sample Pass Level AAA for large text5.58
Pass level 2 fo regular text
Pass 135 Fail 306
#ff6 Sample Pass Level AAA for large text5.62
Pass level 2 fo regular text
Pass 141 Fail 357
#ff9 Sample Pass Level AAA for large text5.70
Pass level 2 fo regular text
Pass 147 Fail 408
#ffc Sample Pass Level AAA for large text5.81
Pass level 2 fo regular text
Pass 153 Fail 459
#fff Sample Pass Level AAA for large text5.98
Pass level 2 fo regular text
Pass 158 Pass 510

Other Background Colour Combinations

Examine luminosity contrast ratios with other web safe backround colours.