#21376E
Closest named color: Marine Blue (#01386A). oklch(35.1% 0.099 265.2), rgb(33, 55, 110).
Aa
White text reads best on this color (11.43:1).
About this color
#21376E is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.099 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.025 away. White text reads best on it, at 11.43:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.83:1 |
| White text | 11.43:1 |
Values
| HEX | #21376E |
| RGB | rgb(33, 55, 110) |
| HSL | hsl(223, 54%, 28%) |
| OKLCH | oklch(35.1% 0.099 265.2) |
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 #21376E | 11.43:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #21376E | 1.83:1 | Fails | Lc 7.8 | Not readable |
| #21376E text on white | 11.43:1 | AAA | Lc 96.1 | Preferred for body text |
| #21376E text on black | 1.83:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#A9C0F2
oklch(80.8% 0.075 265.5)
-
Step 400
400
#7C9EEB
oklch(70.6% 0.12 265.3)
-
Step 500
500
#5C84E5
oklch(63% 0.153 265.4)
-
Step 600
600
#436CD3
oklch(55.7% 0.165 265.1)
-
Step 700
700
#3559B7
oklch(49.1% 0.155 265.3)
-
Step 800
800
#2C4994
oklch(42.6% 0.128 265.4)
-
Step 900
900 (this color)
#21376E
oklch(35.1% 0.099 265.2)
-
Step 950
950
#172545
oklch(27% 0.063 264.7)
#21376E 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) | #1A3D70 | 0.018 |
| Deuteranopia (no green cones) | #0A366D | 0.021 |
| Tritanopia (no blue cones) | #00444D | 0.082 |
| Achromatopsia (no color) | #3A3A3A | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21376E
#21376E
oklch(35.1% 0.099 265.2)
- #4C3700
#4C3700
oklch(35.1% 0.072 84.7)
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 #21376E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.025
- Twilight Blue #0A437A ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.041
- Marine #042E60 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.063
- Dark Grey Blue #29465B ΔE 0.065
- Midnight Green #073B4C ΔE 0.069
- Cobalt #1E488F ΔE 0.069
Use #21376E 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.