#182D3A
Closest named color: Oxford Blue (#1B263B). oklch(28.6% 0.036 237.1), rgb(24, 45, 58).
Aa
White text reads best on this color (14.23:1).
About this color
#182D3A is a dark, muted blue. In OKLCH its lightness is 29%, its chroma 0.036 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.025 away. White text reads best on it, at 14.23:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.47:1 |
| White text | 14.23:1 |
Values
| HEX | #182D3A |
| RGB | rgb(24, 45, 58) |
| HSL | hsl(203, 41%, 16%) |
| OKLCH | oklch(28.6% 0.036 237.1) |
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 #182D3A | 14.23:1 | AAA | Lc -103.9 | Preferred for body text |
| Black text on #182D3A | 1.47:1 | Fails | Lc 0.0 | Not readable |
| #182D3A text on white | 14.23:1 | AAA | Lc 100.9 | Preferred for body text |
| #182D3A text on black | 1.47:1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A8C5D9
oklch(80.8% 0.042 238.2)
-
Step 400
400
#77A7C6
oklch(70.6% 0.069 237.3)
-
Step 500
500
#5291B8
oklch(63% 0.088 237.5)
-
Step 600
600
#347BA4
oklch(55.6% 0.095 237.3)
-
Step 700
700
#25688C
oklch(49.2% 0.088 236.2)
-
Step 800
800
#215572
oklch(42.8% 0.073 236.5)
-
Step 900
900
#21465C
oklch(37.7% 0.057 237)
-
Step 950
950 (this color)
#182D3A
oklch(28.6% 0.036 237.1)
#182D3A 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) | #272D3B | 0.022 |
| Deuteranopia (no green cones) | #22293A | 0.018 |
| Tritanopia (no blue cones) | #063031 | 0.028 |
| Achromatopsia (no color) | #2B2B2B | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #182D3A
#182D3A
oklch(28.6% 0.036 237.1)
- #382618
#382618
oklch(28.6% 0.036 58.6)
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 #182D3A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.025
- Dark #1B2431 ΔE 0.031
- Space Cadet #2B2D42 ΔE 0.033
- Gunmetal #293241 ΔE 0.033
- Jet #212529 ΔE 0.036
- Midnight Green #073B4C ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.055
Use #182D3A 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.