#172A50
Closest named color: Marine (#042E60). oklch(29.1% 0.074 262.7), rgb(23, 42, 80).
Aa
White text reads best on this color (14.15:1).
About this color
#172A50 is a dark, moderately saturated blue. In OKLCH its lightness is 29%, its chroma 0.074 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.031 away. White text reads best on it, at 14.15:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.48:1 |
| White text | 14.15:1 |
Values
| HEX | #172A50 |
| RGB | rgb(23, 42, 80) |
| HSL | hsl(220, 55%, 20%) |
| OKLCH | oklch(29.1% 0.074 262.7) |
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 #172A50 | 14.15:1 | AAA | Lc -103.7 | Preferred for body text |
| Black text on #172A50 | 1.48:1 | Fails | Lc 0.0 | Not readable |
| #172A50 text on white | 14.15:1 | AAA | Lc 100.7 | Preferred for body text |
| #172A50 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAFA
oklch(88.5% 0.048 262)
-
Step 300
300
#A3C1FA
oklch(80.9% 0.087 263)
-
Step 400
400
#719FF7
oklch(70.8% 0.139 262.4)
-
Step 500
500
#4C83F4
oklch(63% 0.179 262.8)
-
Step 600
600
#306AE3
oklch(55.7% 0.194 262.6)
-
Step 700
700
#2357C5
oklch(49.1% 0.181 262.7)
-
Step 800
800
#1F489F
oklch(42.7% 0.149 262.8)
-
Step 900
900
#1E3D7E
oklch(37.6% 0.116 262.9)
-
Step 950
950 (this color)
#172A50
oklch(29.1% 0.074 262.7)
#172A50 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) | #182E51 | 0.013 |
| Deuteranopia (no green cones) | #0F294F | 0.010 |
| Tritanopia (no blue cones) | #003339 | 0.061 |
| Achromatopsia (no color) | #2B2B2B | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172A50
#172A50
oklch(29.1% 0.074 262.7)
- #3A2800
#3A2800
oklch(29.1% 0.06 82.4)
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 #172A50, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.041
- Gunmetal #293241 ΔE 0.050
- Dark #1B2431 ΔE 0.057
- Marine Blue #01386A ΔE 0.058
- Midnight Green #073B4C ΔE 0.058
Use #172A50 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.