#00638E
Closest named color: Peacock Blue (#016795). oklch(47.3% 0.103 236.9), rgb(0, 99, 142).
Aa
White text reads best on this color (6.61:1).
About this color
#00638E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.103 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Peacock Blue (#016795), ΔE 0.015 away. White text reads best on it, at 6.61:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Peacock Blue (#016795) |
| Black text | 3.17:1 |
| White text | 6.61:1 |
Values
| HEX | #00638E |
| RGB | rgb(0, 99, 142) |
| HSL | hsl(198, 100%, 28%) |
| OKLCH | oklch(47.3% 0.103 236.9) |
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 #00638E | 6.61:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #00638E | 3.17:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #00638E text on white | 6.61:1 | AA | Lc 82.1 | Fine for body text |
| #00638E text on black | 3.17:1 | AA large text | Lc -19.8 | 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
#A3C6DD
oklch(80.9% 0.05 237)
-
Step 400
400
#6FA8CC
oklch(70.6% 0.08 237.2)
-
Step 500
500
#4492BF
oklch(63% 0.102 236.8)
-
Step 600
600
#1E7CAC
oklch(55.7% 0.111 237)
-
Step 700
700 (this color)
#00638E
oklch(47.3% 0.103 236.9)
-
Step 800
800
#115578
oklch(42.7% 0.086 237.3)
-
Step 900
900
#184660
oklch(37.6% 0.066 237.2)
-
Step 950
950
#102938
oklch(26.9% 0.042 237.4)
#00638E 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) | #4E6390 | 0.058 |
| Deuteranopia (no green cones) | #3C588D | 0.045 |
| Tritanopia (no blue cones) | #006E72 | 0.065 |
| Achromatopsia (no color) | #5D5D5D | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00638E
#00638E
oklch(47.3% 0.103 236.9)
- #864A15
#864A15
oklch(47.2% 0.103 56.8)
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 #00638E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Peacock Blue #016795 ΔE 0.015
- Light Navy Blue #2E5A88 ΔE 0.031
- Denim #3B638C ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.042
- Ocean Blue #03719C ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.047
- Dusk Blue #26538D ΔE 0.048
- Dusky Blue #475F94 ΔE 0.051
Use #00638E 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.