#172B64
Closest named color: Marine (#042E60). oklch(31% 0.104 265.9), rgb(23, 43, 100).
Aa
White text reads best on this color (13.40:1).
About this color
#172B64 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.104 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.018 away. White text reads best on it, at 13.40:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.56:1 |
| White text | 13.40:1 |
Values
| HEX | #172B64 |
| RGB | rgb(23, 43, 100) |
| HSL | hsl(224, 63%, 24%) |
| OKLCH | oklch(31% 0.104 265.9) |
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 #172B64 | 13.40:1 | AAA | Lc -102.7 | Preferred for body text |
| Black text on #172B64 | 1.56:1 | Fails | Lc 0.0 | Not readable |
| #172B64 text on white | 13.40:1 | AAA | Lc 99.5 | Preferred for body text |
| #172B64 text on black | 1.56:1 | 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
#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
#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
#2F5DFF
oklch(55.5% 0.245 265.9)
-
Step 700
700
#1E43ED
oklch(49.1% 0.254 265.9)
-
Step 800
800
#1939C0
oklch(42.7% 0.211 265.9)
-
Step 900
900
#183497
oklch(37.7% 0.165 266)
-
Step 950
950 (this color)
#172B64
oklch(31% 0.104 265.9)
#172B64 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) | #023366 | 0.025 |
| Deuteranopia (no green cones) | #002C63 | 0.018 |
| Tritanopia (no blue cones) | #003943 | 0.083 |
| Achromatopsia (no color) | #2F2F2F | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172B64
#172B64
oklch(31% 0.104 265.9)
- #3E2D00
#3E2D00
oklch(30.8% 0.063 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 #172B64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.018
- Marine Blue #01386A ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.042
- Midnight Blue #191970 ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.068
- Dark Blue Grey #1F3B4D ΔE 0.072
- Midnight Green #073B4C ΔE 0.073
- Oxford Blue #1B263B ΔE 0.074
Use #172B64 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.