#21336E
Closest named color: Marine Blue (#01386A). oklch(34.2% 0.105 267.8), rgb(33, 51, 110).
Aa
White text reads best on this color (11.90:1).
About this color
#21336E is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.105 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.028 away. White text reads best on it, at 11.90:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.76:1 |
| White text | 11.90:1 |
Values
| HEX | #21336E |
| RGB | rgb(33, 51, 110) |
| HSL | hsl(226, 54%, 28%) |
| OKLCH | oklch(34.2% 0.105 267.8) |
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 #21336E | 11.90:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #21336E | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #21336E text on white | 11.90:1 | AAA | Lc 97.0 | Preferred for body text |
| #21336E text on black | 1.76:1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#AAC0F4
oklch(80.9% 0.078 266.8)
-
Step 400
400
#7E9DEF
oklch(70.7% 0.126 267.4)
-
Step 500
500
#5F82EA
oklch(63.1% 0.161 267.6)
-
Step 600
600
#4769D8
oklch(55.6% 0.174 267.6)
-
Step 700
700
#3957BB
oklch(49.2% 0.161 267.5)
-
Step 800
800
#2F4798
oklch(42.6% 0.136 267.8)
-
Step 900
900 (this color)
#21336E
oklch(34.2% 0.105 267.8)
-
Step 950
950
#182447
oklch(27% 0.067 267.5)
#21336E 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) | #103B70 | 0.025 |
| Deuteranopia (no green cones) | #00346D | 0.026 |
| Tritanopia (no blue cones) | #00414B | 0.087 |
| Achromatopsia (no color) | #373737 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21336E
#21336E
oklch(34.2% 0.105 267.8)
- #483600
#483600
oklch(34.3% 0.07 87.9)
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 #21336E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.028
- Marine #042E60 ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.048
- Midnight Blue #191970 ΔE 0.067
- Dark Blue Grey #1F3B4D ΔE 0.068
- Midnight Green #073B4C ΔE 0.074
- Dark Grey Blue #29465B ΔE 0.075
Use #21336E 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.