#172E5B
Closest named color: Marine (#042E60). oklch(31% 0.086 262.2), rgb(23, 46, 91).
Aa
White text reads best on this color (13.30:1).
About this color
#172E5B is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.086 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.017 away. White text reads best on it, at 13.30:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.57:1 |
| White text | 13.30:1 |
Values
| HEX | #172E5B |
| RGB | rgb(23, 46, 91) |
| HSL | hsl(220, 60%, 22%) |
| OKLCH | oklch(31% 0.086 262.2) |
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 #172E5B | 13.30:1 | AAA | Lc -102.7 | Preferred for body text |
| Black text on #172E5B | 1.57:1 | Fails | Lc 0.0 | Not readable |
| #172E5B text on white | 13.30:1 | AAA | Lc 99.5 | Preferred for body text |
| #172E5B text on black | 1.57:1 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFE
oklch(93.5% 0.03 262.5)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9FC1FF
oklch(80.9% 0.096 262.2)
-
Step 400
400
#6B9EFF
oklch(70.7% 0.153 262.2)
-
Step 500
500
#4282FF
oklch(63.2% 0.198 262)
-
Step 600
600
#1E65F4
oklch(55.6% 0.225 262.2)
-
Step 700
700
#1152D5
oklch(49% 0.211 262.3)
-
Step 800
800
#1145AC
oklch(42.8% 0.174 262.1)
-
Step 900
900
#153B88
oklch(37.6% 0.136 262.3)
-
Step 950
950 (this color)
#172E5B
oklch(31% 0.086 262.2)
#172E5B 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) | #17335D | 0.015 |
| Deuteranopia (no green cones) | #092D5A | 0.013 |
| Tritanopia (no blue cones) | #003840 | 0.068 |
| Achromatopsia (no color) | #2F2F2F | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172E5B
#172E5B
oklch(31% 0.086 262.2)
- #402C00
#402C00
oklch(30.9% 0.064 81.6)
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 #172E5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.017
- Prussian Blue #1D3557 ΔE 0.026
- Marine Blue #01386A ΔE 0.037
- Space Cadet #2B2D42 ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.055
- Midnight Green #073B4C ΔE 0.056
- Gunmetal #293241 ΔE 0.056
- Oxford Blue #1B263B ΔE 0.059
Use #172E5B 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.