#172B58
Closest named color: Marine (#042E60). oklch(30% 0.085 264), rgb(23, 43, 88).
Aa
White text reads best on this color (13.78:1).
About this color
#172B58 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.085 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.020 away. White text reads best on it, at 13.78:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.52:1 |
| White text | 13.78:1 |
Values
| HEX | #172B58 |
| RGB | rgb(23, 43, 88) |
| HSL | hsl(222, 59%, 22%) |
| OKLCH | oklch(30% 0.085 264) |
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 #172B58 | 13.78:1 | AAA | Lc -103.3 | Preferred for body text |
| Black text on #172B58 | 1.52:1 | Fails | Lc 0.0 | Not readable |
| #172B58 text on white | 13.78:1 | AAA | Lc 100.1 | Preferred for body text |
| #172B58 text on black | 1.52:1 | 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
#C7DAFF
oklch(88.6% 0.055 263.7)
-
Step 300
300
#A1C0FF
oklch(80.8% 0.096 264.1)
-
Step 400
400
#6F9DFF
oklch(70.7% 0.152 263.9)
-
Step 500
500
#4980FF
oklch(63% 0.198 264)
-
Step 600
600
#2A64F4
oklch(55.7% 0.224 263.8)
-
Step 700
700
#1E51D4
oklch(49% 0.209 263.9)
-
Step 800
800
#1A44AB
oklch(42.7% 0.172 263.8)
-
Step 900
900
#1B3B88
oklch(37.8% 0.134 264)
-
Step 950
950 (this color)
#172B58
oklch(30% 0.085 264)
#172B58 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) | #13305A | 0.015 |
| Deuteranopia (no green cones) | #062A57 | 0.016 |
| Tritanopia (no blue cones) | #00353D | 0.068 |
| Achromatopsia (no color) | #2D2D2D | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172B58
#172B58
oklch(30% 0.085 264)
- #3C2B00
#3C2B00
oklch(30.1% 0.062 85.2)
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 #172B58, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.020
- Prussian Blue #1D3557 ΔE 0.034
- Marine Blue #01386A ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.050
- Oxford Blue #1B263B ΔE 0.053
- Gunmetal #293241 ΔE 0.058
- Midnight Green #073B4C ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.061
Use #172B58 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.