#21283F
Closest named color: Oxford Blue (#1B263B). oklch(28.2% 0.044 270.5), rgb(33, 40, 63).
Aa
White text reads best on this color (14.58:1).
About this color
#21283F is a dark, muted blue. In OKLCH its lightness is 28%, its chroma 0.044 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.014 away. White text reads best on it, at 14.58:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.43:1 |
| White text | 14.58:1 |
Values
| HEX | #21283F |
| RGB | rgb(33, 40, 63) |
| HSL | hsl(226, 31%, 19%) |
| OKLCH | oklch(28.2% 0.044 270.5) |
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 #21283F | 14.58:1 | AAA | Lc -104.2 | Preferred for body text |
| Black text on #21283F | 1.43:1 | Fails | Lc 0.0 | Not readable |
| #21283F text on white | 14.58:1 | AAA | Lc 101.4 | Preferred for body text |
| #21283F text on black | 1.43:1 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9ED
oklch(88.6% 0.029 270.4)
-
Step 300
300
#B4C0E3
oklch(81% 0.051 270.3)
-
Step 400
400
#8D9ED5
oklch(70.7% 0.083 270.9)
-
Step 500
500
#7186CA
oklch(63.2% 0.106 270.1)
-
Step 600
600
#5A6EB6
oklch(55.5% 0.115 270.6)
-
Step 700
700
#4A5C9D
oklch(49.1% 0.106 270.4)
-
Step 800
800
#3D4B7F
oklch(42.6% 0.088 270.9)
-
Step 900
900
#343F66
oklch(37.7% 0.069 270.9)
-
Step 950
950 (this color)
#21283F
oklch(28.2% 0.044 270.5)
#21283F 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) | #202A40 | 0.006 |
| Deuteranopia (no green cones) | #1D283E | 0.007 |
| Tritanopia (no blue cones) | #172D30 | 0.040 |
| Achromatopsia (no color) | #292929 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21283F
#21283F
oklch(28.2% 0.044 270.5)
- #31280D
#31280D
oklch(28% 0.044 90.9)
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 #21283F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.014
- Space Cadet #2B2D42 ΔE 0.025
- Dark #1B2431 ΔE 0.030
- Gunmetal #293241 ΔE 0.037
- Jet #212529 ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.062
- Midnight Green #073B4C ΔE 0.063
Use #21283F 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.