#21347C
Closest named color: Marine Blue (#01386A). oklch(35.6% 0.125 268.2), rgb(33, 52, 124).
Aa
White text reads best on this color (11.37:1).
About this color
#21347C is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.125 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.042 away. White text reads best on it, at 11.37:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.84:1 |
| White text | 11.37:1 |
Values
| HEX | #21347C |
| RGB | rgb(33, 52, 124) |
| HSL | hsl(227, 58%, 31%) |
| OKLCH | oklch(35.6% 0.125 268.2) |
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 #21347C | 11.37:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #21347C | 1.84:1 | Fails | Lc 8.1 | Not readable |
| #21347C text on white | 11.37:1 | AAA | Lc 95.8 | Preferred for body text |
| #21347C text on black | 1.84:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CAD9FC
oklch(88.5% 0.051 267)
-
Step 300
300
#A7BFFE
oklch(81% 0.093 268.2)
-
Step 400
400
#799BFD
oklch(70.7% 0.149 268)
-
Step 500
500
#597EFB
oklch(63.1% 0.19 268.1)
-
Step 600
600
#4163EA
oklch(55.5% 0.207 268.1)
-
Step 700
700
#3451CC
oklch(49.1% 0.193 268.1)
-
Step 800
800
#2B43A5
oklch(42.7% 0.16 268.2)
-
Step 900
900 (this color)
#21347C
oklch(35.6% 0.125 268.2)
-
Step 950
950
#16234C
oklch(27% 0.078 267.7)
#21347C 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) | #003E7E | 0.032 |
| Deuteranopia (no green cones) | #00367B | 0.024 |
| Tritanopia (no blue cones) | #004652 | 0.102 |
| Achromatopsia (no color) | #3A3A3A | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21347C
#21347C
oklch(35.6% 0.125 268.2)
- #4C3900
#4C3900
oklch(35.6% 0.073 87.6)
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 #21347C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.042
- Twilight Blue #0A437A ΔE 0.043
- Marine #042E60 ΔE 0.060
- Cobalt #1E488F ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.070
- Midnight Blue #191970 ΔE 0.071
- Royal #0C1793 ΔE 0.076
Use #21347C 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.