#17243D
Closest named color: Oxford Blue (#1B263B). oklch(26.2% 0.051 262.6), rgb(23, 36, 61).
Aa
White text reads best on this color (15.48:1).
About this color
#17243D is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.051 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.011 away. White text reads best on it, at 15.48:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.35:1 |
| White text | 15.48:1 |
Values
| HEX | #17243D |
| RGB | rgb(23, 36, 61) |
| HSL | hsl(219, 45%, 16%) |
| OKLCH | oklch(26.2% 0.051 262.6) |
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 #17243D | 15.48:1 | AAA | Lc -105.0 | Preferred for body text |
| Black text on #17243D | 1.35:1 | Fails | Lc 0.0 | Not readable |
| #17243D text on white | 15.48:1 | AAA | Lc 102.3 | Preferred for body text |
| #17243D text on black | 1.35:1 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CEDAF0
oklch(88.6% 0.033 262.7)
-
Step 300
300
#ACC1E8
oklch(80.8% 0.06 262.8)
-
Step 400
400
#80A1DD
oklch(70.8% 0.096 262)
-
Step 500
500
#6188D3
oklch(63.1% 0.122 262.6)
-
Step 600
600
#4870C1
oklch(55.6% 0.134 263)
-
Step 700
700
#395EA6
oklch(49.2% 0.123 262.3)
-
Step 800
800
#2F4D87
oklch(42.7% 0.103 262.3)
-
Step 900
900
#2A406C
oklch(37.6% 0.081 263)
-
Step 950
950 (this color)
#17243D
oklch(26.2% 0.051 262.6)
#17243D 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) | #1A263E | 0.009 |
| Deuteranopia (no green cones) | #15233C | 0.005 |
| Tritanopia (no blue cones) | #03292D | 0.045 |
| Achromatopsia (no color) | #242424 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17243D
#17243D
oklch(26.2% 0.051 262.6)
- #302203
#302203
oklch(26.2% 0.05 83.7)
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 #17243D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.011
- Dark #1B2431 ΔE 0.023
- Jet #212529 ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.046
- Rich Black #0D1B2A ΔE 0.048
- Gunmetal #293241 ΔE 0.057
- Marine #042E60 ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.068
Use #17243D 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.