#23283F
Closest named color: Oxford Blue (#1B263B). oklch(28.3% 0.043 274), rgb(35, 40, 63).
Aa
White text reads best on this color (14.51:1).
About this color
#23283F is a dark, muted blue. In OKLCH its lightness is 28%, its chroma 0.043 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.017 away. White text reads best on it, at 14.51:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.44:1 |
| White text | 14.51:1 |
Values
| HEX | #23283F |
| RGB | rgb(35, 40, 63) |
| HSL | hsl(229, 29%, 19%) |
| OKLCH | oklch(28.3% 0.043 274) |
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 #23283F | 14.51:1 | AAA | Lc -104.2 | Preferred for body text |
| Black text on #23283F | 1.44:1 | Fails | Lc 0.0 | Not readable |
| #23283F text on white | 14.51:1 | AAA | Lc 101.3 | Preferred for body text |
| #23283F text on black | 1.44:1 | 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
#D3D8EC
oklch(88.4% 0.028 274.6)
-
Step 300
300
#B6BFE2
oklch(80.9% 0.05 273.9)
-
Step 400
400
#909DD4
oklch(70.6% 0.082 273.9)
-
Step 500
500
#7684C8
oklch(63% 0.104 274.2)
-
Step 600
600
#5F6DB5
oklch(55.6% 0.113 273.9)
-
Step 700
700
#4F5B9C
oklch(49.2% 0.105 274)
-
Step 800
800
#404A7E
oklch(42.6% 0.087 273.9)
-
Step 900
900
#363E66
oklch(37.6% 0.069 274)
-
Step 950
950 (this color)
#23283F
oklch(28.3% 0.043 274)
#23283F 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 | 0.007 |
| Deuteranopia (no green cones) | #1E283E | 0.008 |
| Tritanopia (no blue cones) | #1A2D30 | 0.040 |
| Achromatopsia (no color) | #292929 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23283F
#23283F
oklch(28.3% 0.043 274)
- #31290F
#31290F
oklch(28.3% 0.042 92.4)
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 #23283F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.017
- Space Cadet #2B2D42 ΔE 0.022
- Dark #1B2431 ΔE 0.031
- Gunmetal #293241 ΔE 0.036
- Jet #212529 ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.062
- Midnight Green #073B4C ΔE 0.063
Use #23283F 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.