#21273E
Closest named color: Oxford Blue (#1B263B). oklch(27.8% 0.043 272.2), rgb(33, 39, 62).
Aa
White text reads best on this color (14.74:1).
About this color
#21273E is a dark, muted blue. In OKLCH its lightness is 28%, its chroma 0.043 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.012 away. White text reads best on it, at 14.74:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.42:1 |
| White text | 14.74:1 |
Values
| HEX | #21273E |
| RGB | rgb(33, 39, 62) |
| HSL | hsl(228, 31%, 19%) |
| OKLCH | oklch(27.8% 0.043 272.2) |
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 #21273E | 14.74:1 | AAA | Lc -104.4 | Preferred for body text |
| Black text on #21273E | 1.42:1 | Fails | Lc 0.0 | Not readable |
| #21273E text on white | 14.74:1 | AAA | Lc 101.5 | Preferred for body text |
| #21273E text on black | 1.42:1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F4
oklch(93.5% 0.015 273.8)
-
Step 200
200
#D2D8ED
oklch(88.4% 0.03 273.1)
-
Step 300
300
#B5BFE3
oklch(80.9% 0.052 273)
-
Step 400
400
#8E9ED5
oklch(70.7% 0.083 271.6)
-
Step 500
500
#7385C9
oklch(63.1% 0.105 271.8)
-
Step 600
600
#5C6EB6
oklch(55.7% 0.114 271.7)
-
Step 700
700
#4C5B9D
oklch(49.1% 0.107 272.3)
-
Step 800
800
#3E4B7F
oklch(42.7% 0.088 271.6)
-
Step 900
900
#353F66
oklch(37.8% 0.068 271.9)
-
Step 950
950 (this color)
#21273E
oklch(27.8% 0.043 272.2)
#21273E 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) | #1F293F | 0.007 |
| Deuteranopia (no green cones) | #1D273D | 0.007 |
| Tritanopia (no blue cones) | #182C2F | 0.040 |
| Achromatopsia (no color) | #282828 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21273E
#21273E
oklch(27.8% 0.043 272.2)
- #30280D
#30280D
oklch(27.9% 0.043 92.9)
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 #21273E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.012
- Dark #1B2431 ΔE 0.027
- Space Cadet #2B2D42 ΔE 0.028
- Jet #212529 ΔE 0.039
- Gunmetal #293241 ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.057
- Rich Black #0D1B2A ΔE 0.063
- Marine #042E60 ΔE 0.065
Use #21273E 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.