#172838
Closest named color: Oxford Blue (#1B263B). oklch(27% 0.038 247.9), rgb(23, 40, 56).
Aa
White text reads best on this color (15.03:1).
About this color
#172838 is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.038 and its hue 248°. 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 15.03:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.39:1 |
| White text | 15.03:1 |
Values
| HEX | #172838 |
| RGB | rgb(23, 40, 56) |
| HSL | hsl(209, 42%, 15%) |
| OKLCH | oklch(27% 0.038 247.9) |
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 #172838 | 15.03:1 | AAA | Lc -104.6 | Preferred for body text |
| Black text on #172838 | 1.39:1 | Fails | Lc 0.0 | Not readable |
| #172838 text on white | 15.03:1 | AAA | Lc 101.9 | Preferred for body text |
| #172838 text on black | 1.39:1 | 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
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CDDBE9
oklch(88.5% 0.025 248.1)
-
Step 300
300
#ABC4DD
oklch(81% 0.045 248.4)
-
Step 400
400
#7DA5CB
oklch(70.7% 0.071 247.6)
-
Step 500
500
#5B8EBE
oklch(63.1% 0.091 248)
-
Step 600
600
#4078AA
oklch(55.7% 0.098 247.5)
-
Step 700
700
#316492
oklch(49% 0.092 248.1)
-
Step 800
800
#2A5277
oklch(42.7% 0.077 248.4)
-
Step 900
900
#264460
oklch(37.7% 0.06 248.1)
-
Step 950
950 (this color)
#172838
oklch(27% 0.038 247.9)
#172838 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) | #212839 | 0.015 |
| Deuteranopia (no green cones) | #1D2538 | 0.013 |
| Tritanopia (no blue cones) | #072C2D | 0.033 |
| Achromatopsia (no color) | #272727 | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172838
#172838
oklch(27% 0.038 247.9)
- #332311
#332311
oklch(27.1% 0.038 68.3)
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 #172838, 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 0.016
- Jet #212529 ΔE 0.029
- Space Cadet #2B2D42 ΔE 0.041
- Gunmetal #293241 ΔE 0.047
- Rich Black #0D1B2A ΔE 0.052
- Midnight Green #073B4C ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.066
Use #172838 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.