#00638B
Closest named color: Peacock Blue (#016795). oklch(47.2% 0.1 235), rgb(0, 99, 139).
Aa
White text reads best on this color (6.65:1).
About this color
#00638B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.100 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Peacock Blue (#016795), ΔE 0.018 away. White text reads best on it, at 6.65:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Peacock Blue (#016795) |
| Black text | 3.15:1 |
| White text | 6.65:1 |
Values
| HEX | #00638B |
| RGB | rgb(0, 99, 139) |
| HSL | hsl(197, 100%, 27%) |
| OKLCH | oklch(47.2% 0.1 235) |
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 #00638B | 6.65:1 | AA | Lc -87.4 | Fine for body text |
| Black text on #00638B | 3.15:1 | AA large text | Lc 21.8 | Dividers and decoration only |
| #00638B text on white | 6.65:1 | AA | Lc 82.3 | Fine for body text |
| #00638B text on black | 3.15:1 | AA large text | Lc -19.6 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C9DCE9
oklch(88.4% 0.027 237.6)
-
Step 300
300
#A3C6DC
oklch(80.8% 0.049 235.8)
-
Step 400
400
#6FA9CA
oklch(70.7% 0.077 234.4)
-
Step 500
500
#4593BD
oklch(63.2% 0.099 234.9)
-
Step 600
600
#1F7CA9
oklch(55.5% 0.108 235.4)
-
Step 700
700 (this color)
#00638B
oklch(47.2% 0.1 235)
-
Step 800
800
#125576
oklch(42.6% 0.083 235.9)
-
Step 900
900
#18475F
oklch(37.8% 0.065 234.6)
-
Step 950
950
#102A38
oklch(27.2% 0.041 234.6)
#00638B 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) | #4F638D | 0.059 |
| Deuteranopia (no green cones) | #3E578A | 0.049 |
| Tritanopia (no blue cones) | #006D71 | 0.060 |
| Achromatopsia (no color) | #5C5C5C | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00638B
#00638B
oklch(47.2% 0.1 235)
- #854A1B
#854A1B
oklch(47.1% 0.1 55.2)
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 #00638B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Peacock Blue #016795 ΔE 0.018
- Light Navy Blue #2E5A88 ΔE 0.032
- Denim #3B638C ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.046
- Ocean Blue #03719C ΔE 0.046
- Dusk Blue #26538D ΔE 0.049
- YInMn Blue #415A77 ΔE 0.051
Use #00638B 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.