#172138
Closest named color: Oxford Blue (#1B263B). oklch(25.1% 0.046 265.4), rgb(23, 33, 56).
Aa
White text reads best on this color (16.01:1).
About this color
#172138 is a dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.046 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.019 away. White text reads best on it, at 16.01:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.31:1 |
| White text | 16.01:1 |
Values
| HEX | #172138 |
| RGB | rgb(23, 33, 56) |
| HSL | hsl(222, 42%, 15%) |
| OKLCH | oklch(25.1% 0.046 265.4) |
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 #172138 | 16.01:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #172138 | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #172138 text on white | 16.01:1 | AAA | Lc 102.9 | Preferred for body text |
| #172138 text on black | 1.31:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#CFD9EE
oklch(88.4% 0.031 265.3)
-
Step 300
300
#B0C1E5
oklch(81% 0.054 265.2)
-
Step 400
400
#86A0D8
oklch(70.7% 0.088 265)
-
Step 500
500
#6987CD
oklch(63.1% 0.111 265.7)
-
Step 600
600
#5170BA
oklch(55.6% 0.121 265.5)
-
Step 700
700
#415DA0
oklch(49% 0.113 265.4)
-
Step 800
800
#364C82
oklch(42.6% 0.094 265.8)
-
Step 900
900
#2F4068
oklch(37.7% 0.072 265.6)
-
Step 950
950 (this color)
#172138
oklch(25.1% 0.046 265.4)
#172138 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) | #182339 | 0.007 |
| Deuteranopia (no green cones) | #142037 | 0.006 |
| Tritanopia (no blue cones) | #082629 | 0.042 |
| Achromatopsia (no color) | #212121 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172138
#172138
oklch(25.1% 0.046 265.4)
- #2C2004
#2C2004
oklch(25.2% 0.046 85.3)
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 #172138, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.019
- Dark #1B2431 ΔE 0.020
- Rich Black #0D1B2A ΔE 0.036
- Jet #212529 ΔE 0.039
- Space Cadet #2B2D42 ΔE 0.056
- Gunmetal #293241 ΔE 0.067
- Navy Blue #001146 ΔE 0.069
- Marine #042E60 ΔE 0.078
Use #172138 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.