#172B37
Closest named color: Oxford Blue (#1B263B). oklch(27.8% 0.034 236.2), rgb(23, 43, 55).
Aa
White text reads best on this color (14.61:1).
About this color
#172B37 is a dark, muted blue. In OKLCH its lightness is 28%, its chroma 0.034 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.021 away. White text reads best on it, at 14.61:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.43:1 |
| White text | 14.61:1 |
Values
| HEX | #172B37 |
| RGB | rgb(23, 43, 55) |
| HSL | hsl(203, 41%, 15%) |
| OKLCH | oklch(27.8% 0.034 236.2) |
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 #172B37 | 14.61:1 | AAA | Lc -104.2 | Preferred for body text |
| Black text on #172B37 | 1.43:1 | Fails | Lc 0.0 | Not readable |
| #172B37 text on white | 14.61:1 | AAA | Lc 101.4 | Preferred for body text |
| #172B37 text on black | 1.43:1 | 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
#CCDCE6
oklch(88.5% 0.022 235)
-
Step 300
300
#A9C5D8
oklch(80.9% 0.041 237.7)
-
Step 400
400
#79A7C4
oklch(70.6% 0.065 236.6)
-
Step 500
500
#5591B5
oklch(63% 0.083 236.5)
-
Step 600
600
#387BA1
oklch(55.6% 0.09 236.4)
-
Step 700
700
#29688A
oklch(49.2% 0.084 235.8)
-
Step 800
800
#245570
oklch(42.8% 0.069 235.7)
-
Step 900
900
#23465A
oklch(37.7% 0.053 235.6)
-
Step 950
950 (this color)
#172B37
oklch(27.8% 0.034 236.2)
#172B37 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) | #252B38 | 0.021 |
| Deuteranopia (no green cones) | #212737 | 0.019 |
| Tritanopia (no blue cones) | #072E2F | 0.026 |
| Achromatopsia (no color) | #292929 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172B37
#172B37
oklch(27.8% 0.034 236.2)
- #352418
#352418
oklch(27.8% 0.033 56.1)
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 #172B37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.021
- Dark #1B2431 ΔE 0.024
- Jet #212529 ΔE 0.030
- Space Cadet #2B2D42 ΔE 0.038
- Gunmetal #293241 ΔE 0.040
- Midnight Green #073B4C ΔE 0.057
- Rich Black #0D1B2A ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.062
Use #172B37 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.