#172E7F
Closest named color: Marine Blue (#01386A). oklch(34.1% 0.14 266.5), rgb(23, 46, 127).
Aa
White text reads best on this color (12.11:1).
About this color
#172E7F is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.140 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.048 away. White text reads best on it, at 12.11:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.73:1 |
| White text | 12.11:1 |
Values
| HEX | #172E7F |
| RGB | rgb(23, 46, 127) |
| HSL | hsl(227, 69%, 29%) |
| OKLCH | oklch(34.1% 0.14 266.5) |
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 #172E7F | 12.11:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #172E7F | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #172E7F text on white | 12.11:1 | AAA | Lc 97.1 | Preferred for body text |
| #172E7F text on black | 1.73:1 | 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
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#759CFF
oklch(70.8% 0.151 266.4)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600
#355FF9
oklch(55.6% 0.234 266.5)
-
Step 700
700
#294DD9
oklch(49.1% 0.217 266.5)
-
Step 800
800
#2241AF
oklch(42.8% 0.179 266.4)
-
Step 900
900 (this color)
#172E7F
oklch(34.1% 0.14 266.5)
-
Step 950
950
#122251
oklch(27% 0.089 266.3)
#172E7F 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) | #003B82 | 0.034 |
| Deuteranopia (no green cones) | #00317D | 0.016 |
| Tritanopia (no blue cones) | #004352 | 0.108 |
| Achromatopsia (no color) | #363636 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172E7F
#172E7F
oklch(34.1% 0.14 266.5)
- #483500
#483500
oklch(34.1% 0.07 86.3)
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 #172E7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.048
- Midnight Blue #191970 ΔE 0.055
- Royal #0C1793 ΔE 0.056
- Marine #042E60 ΔE 0.057
- Twilight Blue #0A437A ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.075
- Cobalt #1E488F ΔE 0.075
- Sapphire #2138AB ΔE 0.080
Use #172E7F 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.