#21285A
Closest named color: Marine (#042E60). oklch(30.1% 0.089 273.8), rgb(33, 40, 90).
Aa
White text reads best on this color (13.85:1).
About this color
#21285A is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.089 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.031 away. White text reads best on it, at 13.85:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.51:1 |
| White text | 13.85:1 |
Values
| HEX | #21285A |
| RGB | rgb(33, 40, 90) |
| HSL | hsl(233, 46%, 24%) |
| OKLCH | oklch(30.1% 0.089 273.8) |
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 #21285A | 13.85:1 | AAA | Lc -103.3 | Preferred for body text |
| Black text on #21285A | 1.51:1 | Fails | Lc 0.0 | Not readable |
| #21285A text on white | 13.85:1 | AAA | Lc 100.3 | Preferred for body text |
| #21285A text on black | 1.51:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ADBDFF
oklch(81% 0.095 273.6)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6778FF
oklch(63% 0.199 273.8)
-
Step 600
600
#5058F9
oklch(55.7% 0.235 273.6)
-
Step 700
700
#4246D9
oklch(49.1% 0.218 273.7)
-
Step 800
800
#363BAF
oklch(42.7% 0.18 273.9)
-
Step 900
900
#2D358B
oklch(37.8% 0.141 273.5)
-
Step 950
950 (this color)
#21285A
oklch(30.1% 0.089 273.8)
#21285A 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) | #0C2F5C | 0.028 |
| Deuteranopia (no green cones) | #022A59 | 0.031 |
| Tritanopia (no blue cones) | #00333C | 0.078 |
| Achromatopsia (no color) | #2D2D2D | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21285A
#21285A
oklch(30.1% 0.089 273.8)
- #382D00
#382D00
oklch(30.1% 0.062 94.3)
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 #21285A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.052
- Marine Blue #01386A ΔE 0.054
- Midnight Blue #191970 ΔE 0.056
- Oxford Blue #1B263B ΔE 0.058
- Gunmetal #293241 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.069
Use #21285A 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.