#172F79
Closest named color: Marine Blue (#01386A). oklch(33.8% 0.13 265.9), rgb(23, 47, 121).
Aa
White text reads best on this color (12.21:1).
About this color
#172F79 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.130 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.039 away. White text reads best on it, at 12.21:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.71:1 |
| White text | 12.21:1 |
Values
| HEX | #172F79 |
| RGB | rgb(23, 47, 121) |
| HSL | hsl(225, 68%, 28%) |
| OKLCH | oklch(33.8% 0.13 265.9) |
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 #172F79 | 12.21:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #172F79 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #172F79 text on white | 12.21:1 | AAA | Lc 97.4 | Preferred for body text |
| #172F79 text on black | 1.71:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C8D9FE
oklch(88.5% 0.054 265.8)
-
Step 300
300
#A4C0FF
oklch(81% 0.095 265.8)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#507FFF
oklch(63.1% 0.197 265.8)
-
Step 600
600
#3663EF
oklch(55.5% 0.216 265.8)
-
Step 700
700
#2A51D0
oklch(49.1% 0.201 265.9)
-
Step 800
800
#2343A8
oklch(42.6% 0.167 265.9)
-
Step 900
900 (this color)
#172F79
oklch(33.8% 0.13 265.9)
-
Step 950
950
#13234E
oklch(27% 0.082 265.8)
#172F79 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) | #003A7B | 0.030 |
| Deuteranopia (no green cones) | #003178 | 0.015 |
| Tritanopia (no blue cones) | #00424F | 0.102 |
| Achromatopsia (no color) | #353535 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172F79
#172F79
oklch(33.8% 0.13 265.9)
- #473400
#473400
oklch(33.7% 0.069 86)
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 #172F79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.039
- Marine #042E60 ΔE 0.047
- Midnight Blue #191970 ΔE 0.054
- Twilight Blue #0A437A ΔE 0.055
- Royal #0C1793 ΔE 0.064
- Prussian Blue #1D3557 ΔE 0.064
- Cobalt #1E488F ΔE 0.078
- Dark Blue #00008B ΔE 0.086
Use #172F79 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.