#17243F
Closest named color: Oxford Blue (#1B263B). oklch(26.4% 0.054 263.6), rgb(23, 36, 63).
Aa
White text reads best on this color (15.43:1).
About this color
#17243F is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.054 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.013 away. White text reads best on it, at 15.43:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.36:1 |
| White text | 15.43:1 |
Values
| HEX | #17243F |
| RGB | rgb(23, 36, 63) |
| HSL | hsl(220, 47%, 17%) |
| OKLCH | oklch(26.4% 0.054 263.6) |
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 #17243F | 15.43:1 | AAA | Lc -105.0 | Preferred for body text |
| Black text on #17243F | 1.36:1 | Fails | Lc 0.0 | Not readable |
| #17243F text on white | 15.43:1 | AAA | Lc 102.3 | Preferred for body text |
| #17243F text on black | 1.36:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#ACC1EB
oklch(80.9% 0.064 264.1)
-
Step 400
400
#80A0E1
oklch(70.8% 0.102 263.9)
-
Step 500
500
#6087D8
oklch(63.1% 0.13 263.6)
-
Step 600
600
#476FC6
oklch(55.6% 0.142 263.8)
-
Step 700
700
#385CAB
oklch(49% 0.133 263.8)
-
Step 800
800
#2F4C8A
oklch(42.7% 0.109 263.6)
-
Step 900
900
#2A406F
oklch(37.8% 0.085 263.9)
-
Step 950
950 (this color)
#17243F
oklch(26.4% 0.054 263.6)
#17243F 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) | #192640 | 0.008 |
| Deuteranopia (no green cones) | #14233E | 0.006 |
| Tritanopia (no blue cones) | #022A2E | 0.049 |
| Achromatopsia (no color) | #242424 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17243F
#17243F
oklch(26.4% 0.054 263.6)
- #312200
#312200
oklch(26.3% 0.054 84.1)
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 #17243F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.013
- Dark #1B2431 ΔE 0.027
- Jet #212529 ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.046
- Rich Black #0D1B2A ΔE 0.050
- Gunmetal #293241 ΔE 0.057
- Marine #042E60 ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.066
Use #17243F 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.