#172E39
Closest named color: Oxford Blue (#1B263B). oklch(28.8% 0.035 230.4), rgb(23, 46, 57).
Aa
White text reads best on this color (14.12:1).
About this color
#172E39 is a dark, muted blue. In OKLCH its lightness is 29%, its chroma 0.035 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.029 away. White text reads best on it, at 14.12:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.48:1 |
| White text | 14.12:1 |
Values
| HEX | #172E39 |
| RGB | rgb(23, 46, 57) |
| HSL | hsl(199, 43%, 16%) |
| OKLCH | oklch(28.8% 0.035 230.4) |
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 #172E39 | 14.12:1 | AAA | Lc -103.7 | Preferred for body text |
| Black text on #172E39 | 1.48:1 | Fails | Lc 0.0 | Not readable |
| #172E39 text on white | 14.12:1 | AAA | Lc 100.7 | Preferred for body text |
| #172E39 text on black | 1.48:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADCE6
oklch(88.4% 0.024 231.9)
-
Step 300
300
#A6C6D7
oklch(80.9% 0.042 231.1)
-
Step 400
400
#75A9C3
oklch(70.8% 0.067 230.6)
-
Step 500
500
#4D93B4
oklch(63.1% 0.086 230.7)
-
Step 600
600
#2D7D9F
oklch(55.6% 0.092 230.1)
-
Step 700
700
#1E6988
oklch(49% 0.086 230.3)
-
Step 800
800
#1C566F
oklch(42.8% 0.072 230.5)
-
Step 900
900
#1E475A
oklch(37.7% 0.056 230.9)
-
Step 950
950 (this color)
#172E39
oklch(28.8% 0.035 230.4)
#172E39 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) | #282D3A | 0.024 |
| Deuteranopia (no green cones) | #242A39 | 0.021 |
| Tritanopia (no blue cones) | #043132 | 0.025 |
| Achromatopsia (no color) | #2B2B2B | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172E39
#172E39
oklch(28.8% 0.035 230.4)
- #39261B
#39261B
oklch(28.9% 0.035 51)
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 #172E39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.029
- Gunmetal #293241 ΔE 0.033
- Dark #1B2431 ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.035
- Jet #212529 ΔE 0.037
- Midnight Green #073B4C ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.056
Use #172E39 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.