#172F6B
Closest named color: Marine (#042E60). oklch(32.5% 0.109 264.6), rgb(23, 47, 107).
Aa
White text reads best on this color (12.68:1).
About this color
#172F6B is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.109 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.026 away. White text reads best on it, at 12.68:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.65:1 |
| White text | 12.68:1 |
Values
| HEX | #172F6B |
| RGB | rgb(23, 47, 107) |
| HSL | hsl(223, 65%, 25%) |
| OKLCH | oklch(32.5% 0.109 264.6) |
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 #172F6B | 12.68:1 | AAA | Lc -101.8 | Preferred for body text |
| Black text on #172F6B | 1.65:1 | Fails | Lc 0.0 | Not readable |
| #172F6B text on white | 12.68:1 | AAA | Lc 98.4 | Preferred for body text |
| #172F6B text on black | 1.65:1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CAD9F8
oklch(88.4% 0.046 264.9)
-
Step 300
300
#A6C0F6
oklch(80.8% 0.082 264.6)
-
Step 400
400
#789EF2
oklch(70.7% 0.131 264.8)
-
Step 500
500
#5683EE
oklch(63.1% 0.168 264.8)
-
Step 600
600
#3C6ADC
oklch(55.6% 0.182 264.6)
-
Step 700
700
#2F58BF
oklch(49.2% 0.169 264.6)
-
Step 800
800
#27489A
oklch(42.6% 0.14 264.6)
-
Step 900
900 (this color)
#172F6B
oklch(32.5% 0.109 264.6)
-
Step 950
950
#152448
oklch(26.9% 0.07 265)
#172F6B 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) | #04376D | 0.024 |
| Deuteranopia (no green cones) | #002F6A | 0.017 |
| Tritanopia (no blue cones) | #003E48 | 0.087 |
| Achromatopsia (no color) | #333333 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172F6B
#172F6B
oklch(32.5% 0.109 264.6)
- #443100
#443100
oklch(32.6% 0.067 84.9)
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 #172F6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.026
- Marine Blue #01386A ΔE 0.028
- Prussian Blue #1D3557 ΔE 0.043
- Midnight Blue #191970 ΔE 0.054
- Twilight Blue #0A437A ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.072
- Midnight Green #073B4C ΔE 0.073
- Space Cadet #2B2D42 ΔE 0.076
Use #172F6B 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.