#172F6F
Closest named color: Marine Blue (#01386A). oklch(32.9% 0.115 265.1), rgb(23, 47, 111).
Aa
White text reads best on this color (12.55:1).
About this color
#172F6F is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.115 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.030 away. White text reads best on it, at 12.55:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.67:1 |
| White text | 12.55:1 |
Values
| HEX | #172F6F |
| RGB | rgb(23, 47, 111) |
| HSL | hsl(224, 66%, 26%) |
| OKLCH | oklch(32.9% 0.115 265.1) |
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 #172F6F | 12.55:1 | AAA | Lc -101.5 | Preferred for body text |
| Black text on #172F6F | 1.67:1 | Fails | Lc 0.0 | Not readable |
| #172F6F text on white | 12.55:1 | AAA | Lc 98.1 | Preferred for body text |
| #172F6F text on black | 1.67:1 | 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 900.
-
Step 50
50
#F2F6FE
oklch(97.2% 0.012 264.5)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A5C0F9
oklch(80.8% 0.086 264.8)
-
Step 400
400
#769DF7
oklch(70.6% 0.139 265.3)
-
Step 500
500
#5482F3
oklch(63.1% 0.177 265.1)
-
Step 600
600
#3A68E2
oklch(55.6% 0.193 265)
-
Step 700
700
#2D56C4
oklch(49.1% 0.178 265)
-
Step 800
800
#26479E
oklch(42.7% 0.147 265)
-
Step 900
900 (this color)
#172F6F
oklch(32.9% 0.115 265.1)
-
Step 950
950
#15244A
oklch(27% 0.073 265.6)
#172F6F 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) | #003871 | 0.027 |
| Deuteranopia (no green cones) | #00306E | 0.016 |
| Tritanopia (no blue cones) | #003F4A | 0.091 |
| Achromatopsia (no color) | #333333 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172F6F
#172F6F
oklch(32.9% 0.115 265.1)
- #453200
#453200
oklch(33% 0.068 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 #172F6F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.030
- Marine #042E60 ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.049
- Midnight Blue #191970 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.077
- Royal #0C1793 ΔE 0.077
- Midnight Green #073B4C ΔE 0.079
Use #172F6F 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.