#0663AA
Closest named color: Mid Blue (#276AB3). oklch(49.2% 0.136 249.9), rgb(6, 99, 170).
Aa
White text reads best on this color (6.22:1).
About this color
#0663AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.136 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.030 away. White text reads best on it, at 6.22:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.37:1 |
| White text | 6.22:1 |
Values
| HEX | #0663AA |
| RGB | rgb(6, 99, 170) |
| HSL | hsl(206, 93%, 35%) |
| OKLCH | oklch(49.2% 0.136 249.9) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #0663AA | 6.22:1 | AA | Lc -85.6 | Fine for body text |
| Black text on #0663AA | 3.37:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #0663AA text on white | 6.22:1 | AA | Lc 80.4 | Fine for body text |
| #0663AA text on black | 3.37:1 | AA large text | Lc -21.4 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCF1
oklch(88.6% 0.036 249.5)
-
Step 300
300
#A1C5EA
oklch(81% 0.065 249.3)
-
Step 400
400
#6CA5E0
oklch(70.6% 0.106 250.3)
-
Step 500
500
#408ED7
oklch(63.2% 0.134 249.5)
-
Step 600
600
#1976C5
oklch(55.6% 0.147 250.1)
-
Step 700
700 (this color)
#0663AA
oklch(49.2% 0.136 249.9)
-
Step 800
800
#0D518A
oklch(42.7% 0.113 250)
-
Step 900
900
#16446E
oklch(37.8% 0.087 249.7)
-
Step 950
950
#0E2840
oklch(27% 0.055 249)
#0663AA with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #3F68AD | 0.041 |
| Deuteranopia (no green cones) | #235BA9 | 0.023 |
| Tritanopia (no blue cones) | #00747E | 0.098 |
| Achromatopsia (no color) | #616161 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0663AA
#0663AA
oklch(49.2% 0.136 249.9)
- #875400
#875400
oklch(49.2% 0.107 69.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #0663AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.030
- Peacock Blue #016795 ΔE 0.038
- Denim Blue #3B5B92 ΔE 0.048
- French Blue #436BAD ΔE 0.050
- Ocean Blue #03719C ΔE 0.051
- Dusky Blue #475F94 ΔE 0.054
- Denim #3B638C ΔE 0.056
- Light Navy Blue #2E5A88 ΔE 0.057
Use #0663AA in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.