#21305C
Closest named color: Prussian Blue (#1D3557). oklch(32.1% 0.081 267.6), rgb(33, 48, 92).
Aa
White text reads best on this color (12.78:1).
About this color
#21305C is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.081 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.020 away. White text reads best on it, at 12.78:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.64:1 |
| White text | 12.78:1 |
Values
| HEX | #21305C |
| RGB | rgb(33, 48, 92) |
| HSL | hsl(225, 47%, 25%) |
| OKLCH | oklch(32.1% 0.081 267.6) |
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 #21305C | 12.78:1 | AAA | Lc -102.1 | Preferred for body text |
| Black text on #21305C | 1.64:1 | Fails | Lc 0.0 | Not readable |
| #21305C text on white | 12.78:1 | AAA | Lc 98.7 | Preferred for body text |
| #21305C text on black | 1.64:1 | 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 950.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CAD9FD
oklch(88.6% 0.052 267.4)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#779BFF
oklch(70.7% 0.152 267.5)
-
Step 500
500
#567EFE
oklch(63.2% 0.195 267.5)
-
Step 600
600
#3E63ED
oklch(55.6% 0.212 267.5)
-
Step 700
700
#3150CE
oklch(49% 0.198 267.6)
-
Step 800
800
#2943A7
oklch(42.8% 0.164 267.7)
-
Step 900
900
#243A84
oklch(37.7% 0.127 267.4)
-
Step 950
950 (this color)
#21305C
oklch(32.1% 0.081 267.6)
#21305C 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) | #1C355E | 0.015 |
| Deuteranopia (no green cones) | #13305B | 0.016 |
| Tritanopia (no blue cones) | #003A41 | 0.071 |
| Achromatopsia (no color) | #323232 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21305C
#21305C
oklch(32.1% 0.081 267.6)
- #413000
#413000
oklch(32% 0.065 87.1)
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 #21305C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.020
- Marine #042E60 ΔE 0.029
- Marine Blue #01386A ΔE 0.037
- Space Cadet #2B2D42 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.049
- Gunmetal #293241 ΔE 0.052
- Midnight Green #073B4C ΔE 0.054
- Oxford Blue #1B263B ΔE 0.065
Use #21305C 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.