#00283F
Closest named color: Oxford Blue (#1B263B). oklch(26.4% 0.06 239.9), rgb(0, 40, 63).
Aa
White text reads best on this color (15.26:1).
About this color
#00283F is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.060 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.027 away. White text reads best on it, at 15.26:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.37:1 |
| White text | 15.26:1 |
Values
| HEX | #00283F |
| RGB | rgb(0, 40, 63) |
| HSL | hsl(202, 100%, 12%) |
| OKLCH | oklch(26.4% 0.06 239.9) |
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 #00283F | 15.26:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #00283F | 1.37:1 | Fails | Lc 0.0 | Not readable |
| #00283F text on white | 15.26:1 | AAA | Lc 101.9 | Preferred for body text |
| #00283F 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C2DDF1
oklch(88.4% 0.04 240)
-
Step 300
300
#97C7EB
oklch(80.8% 0.072 241.2)
-
Step 400
400
#56AAE0
oklch(70.8% 0.114 239.3)
-
Step 500
500
#0093D7
oklch(63.2% 0.144 239.7)
-
Step 600
600
#007BB5
oklch(55.6% 0.127 239.8)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#00557F
oklch(42.8% 0.098 239.8)
-
Step 900
900
#00466A
oklch(37.6% 0.086 240.1)
-
Step 950
950 (this color)
#00283F
oklch(26.4% 0.06 239.9)
#00283F 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) | #1D2840 | 0.031 |
| Deuteranopia (no green cones) | #14233F | 0.023 |
| Tritanopia (no blue cones) | #002E30 | 0.040 |
| Achromatopsia (no color) | #252525 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00283F
#00283F
oklch(26.4% 0.06 239.9)
- #3A1D01
#3A1D01
oklch(26.5% 0.061 60.5)
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 #00283F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.027
- Dark #1B2431 ΔE 0.035
- Jet #212529 ΔE 0.051
- Rich Black #0D1B2A ΔE 0.053
- Space Cadet #2B2D42 ΔE 0.057
- Gunmetal #293241 ΔE 0.062
- Marine #042E60 ΔE 0.062
- Midnight Green #073B4C ΔE 0.067
Use #00283F 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.