#066CA5
Closest named color: Ocean Blue (#03719C). oklch(51% 0.121 242.8), rgb(6, 108, 165).
Aa
White text reads best on this color (5.68:1).
About this color
#066CA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.121 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.023 away. White text reads best on it, at 5.68:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.69:1 |
| White text | 5.68:1 |
Values
| HEX | #066CA5 |
| RGB | rgb(6, 108, 165) |
| HSL | hsl(202, 93%, 34%) |
| OKLCH | oklch(51% 0.121 242.8) |
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 #066CA5 | 5.68:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #066CA5 | 3.69:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #066CA5 text on white | 5.68:1 | AA | Lc 77.8 | Fine for body text |
| #066CA5 text on black | 3.69:1 | AA large text | Lc -23.9 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C7DCED
oklch(88.4% 0.033 242.4)
-
Step 300
300
#A0C6E4
oklch(80.9% 0.059 242.2)
-
Step 400
400
#6BA8D6
oklch(70.8% 0.093 242.3)
-
Step 500
500
#3D91CC
oklch(63.2% 0.12 242.7)
-
Step 600
600
#0E7AB8
oklch(55.6% 0.129 242.5)
-
Step 700
700 (this color)
#066CA5
oklch(51% 0.121 242.8)
-
Step 800
800
#065481
oklch(42.8% 0.1 242.6)
-
Step 900
900
#134567
oklch(37.5% 0.078 243.1)
-
Step 950
950
#0D293D
oklch(27% 0.05 242.9)
#066CA5 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) | #506EA7 | 0.054 |
| Deuteranopia (no green cones) | #3B61A4 | 0.040 |
| Tritanopia (no blue cones) | #007A81 | 0.081 |
| Achromatopsia (no color) | #676767 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #066CA5
#066CA5
oklch(51% 0.121 242.8)
- #945400
#945400
oklch(51% 0.117 62.4)
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 #066CA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.023
- Peacock Blue #016795 ΔE 0.028
- Mid Blue #276AB3 ΔE 0.028
- Muted Blue #3B719F ΔE 0.036
- Sea Blue #047495 ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.040
- French Blue #436BAD ΔE 0.041
- Nice Blue #107AB0 ΔE 0.042
Use #066CA5 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.