#21233C
Closest named color: Oxford Blue (#1B263B). oklch(26.7% 0.046 279.3), rgb(33, 35, 60).
Aa
White text reads best on this color (15.32:1).
About this color
#21233C is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.046 and its hue 279°. 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 15.32:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.37:1 |
| White text | 15.32:1 |
Values
| HEX | #21233C |
| RGB | rgb(33, 35, 60) |
| HSL | hsl(236, 29%, 18%) |
| OKLCH | oklch(26.7% 0.046 279.3) |
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 #21233C | 15.32:1 | AAA | Lc -104.9 | Preferred for body text |
| Black text on #21233C | 1.37:1 | Fails | Lc 0.0 | Not readable |
| #21233C text on white | 15.32:1 | AAA | Lc 102.2 | Preferred for body text |
| #21233C text on black | 1.37:1 | 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
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D4D7EE
oklch(88.4% 0.032 279.8)
-
Step 300
300
#B8BEE4
oklch(80.9% 0.054 278.1)
-
Step 400
400
#959BD7
oklch(70.7% 0.088 279.5)
-
Step 500
500
#7B81CC
oklch(63% 0.112 279.2)
-
Step 600
600
#656AB9
oklch(55.7% 0.121 278.9)
-
Step 700
700
#5458A0
oklch(49.2% 0.114 278.9)
-
Step 800
800
#454881
oklch(42.7% 0.094 279.4)
-
Step 900
900
#3A3D68
oklch(37.8% 0.073 279.3)
-
Step 950
950 (this color)
#21233C
oklch(26.7% 0.046 279.3)
#21233C 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) | #1B263D | 0.013 |
| Deuteranopia (no green cones) | #19243B | 0.013 |
| Tritanopia (no blue cones) | #19282C | 0.041 |
| Achromatopsia (no color) | #252525 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21233C
#21233C
oklch(26.7% 0.046 279.3)
- #2B2608
#2B2608
oklch(26.7% 0.046 99.8)
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 #21233C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.014
- Dark #1B2431 ΔE 0.025
- Space Cadet #2B2D42 ΔE 0.039
- Jet #212529 ΔE 0.039
- Gunmetal #293241 ΔE 0.053
- Rich Black #0D1B2A ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.068
- Marine #042E60 ΔE 0.072
Use #21233C 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.