#172A57
Closest named color: Marine (#042E60). oklch(29.7% 0.085 264.6), rgb(23, 42, 87).
Aa
White text reads best on this color (13.95:1).
About this color
#172A57 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.085 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.022 away. White text reads best on it, at 13.95:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.50:1 |
| White text | 13.95:1 |
Values
| HEX | #172A57 |
| RGB | rgb(23, 42, 87) |
| HSL | hsl(222, 58%, 22%) |
| OKLCH | oklch(29.7% 0.085 264.6) |
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 #172A57 | 13.95:1 | AAA | Lc -103.4 | Preferred for body text |
| Black text on #172A57 | 1.50:1 | Fails | Lc 0.0 | Not readable |
| #172A57 text on white | 13.95:1 | AAA | Lc 100.4 | Preferred for body text |
| #172A57 text on black | 1.50:1 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4C80FF
oklch(63.2% 0.197 264.6)
-
Step 600
600
#2E63F3
oklch(55.5% 0.223 264.6)
-
Step 700
700
#2251D4
oklch(49.1% 0.208 264.5)
-
Step 800
800
#1D43AB
oklch(42.6% 0.172 264.6)
-
Step 900
900
#1C3A88
oklch(37.6% 0.135 264.7)
-
Step 950
950 (this color)
#172A57
oklch(29.7% 0.085 264.6)
#172A57 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) | #122F59 | 0.015 |
| Deuteranopia (no green cones) | #042956 | 0.018 |
| Tritanopia (no blue cones) | #00343C | 0.068 |
| Achromatopsia (no color) | #2C2C2C | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172A57
#172A57
oklch(29.7% 0.085 264.6)
- #3B2A00
#3B2A00
oklch(29.7% 0.061 84.8)
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 #172A57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.022
- Prussian Blue #1D3557 ΔE 0.037
- Marine Blue #01386A ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.050
- Oxford Blue #1B263B ΔE 0.051
- Gunmetal #293241 ΔE 0.059
- Midnight Blue #191970 ΔE 0.061
- Midnight Green #073B4C ΔE 0.063
Use #172A57 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.