#172F5D
Closest named color: Marine (#042E60). oklch(31.4% 0.088 261.9), rgb(23, 47, 93).
Aa
White text reads best on this color (13.11:1).
About this color
#172F5D is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.088 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 13.11:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.60:1 |
| White text | 13.11:1 |
Values
| HEX | #172F5D |
| RGB | rgb(23, 47, 93) |
| HSL | hsl(219, 60%, 23%) |
| OKLCH | oklch(31.4% 0.088 261.9) |
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 #172F5D | 13.11:1 | AAA | Lc -102.4 | Preferred for body text |
| Black text on #172F5D | 1.60:1 | Fails | Lc 0.0 | Not readable |
| #172F5D text on white | 13.11:1 | AAA | Lc 99.2 | Preferred for body text |
| #172F5D text on black | 1.60:1 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
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
#6A9EFF
oklch(70.6% 0.153 261.9)
-
Step 500
500
#4182FF
oklch(63.1% 0.198 261.8)
-
Step 600
600
#1964F7
oklch(55.6% 0.231 262)
-
Step 700
700
#0B52D7
oklch(49.1% 0.214 261.9)
-
Step 800
800
#0D44AE
oklch(42.7% 0.178 261.9)
-
Step 900
900
#133B89
oklch(37.6% 0.138 261.9)
-
Step 950
950 (this color)
#172F5D
oklch(31.4% 0.088 261.9)
#172F5D 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) | #17345F | 0.015 |
| Deuteranopia (no green cones) | #092D5C | 0.015 |
| Tritanopia (no blue cones) | #003A41 | 0.071 |
| Achromatopsia (no color) | #303030 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172F5D
#172F5D
oklch(31.4% 0.088 261.9)
- #412D00
#412D00
oklch(31.2% 0.064 82)
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 #172F5D, 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 0.025
- Marine Blue #01386A ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.055
- Midnight Green #073B4C ΔE 0.055
- Gunmetal #293241 ΔE 0.058
- Oxford Blue #1B263B ΔE 0.063
Use #172F5D 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.