#173870
Closest named color: Marine Blue (#01386A). oklch(35% 0.105 260.3), rgb(23, 56, 112).
Aa
White text reads best on this color (11.43:1).
About this color
#173870 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.105 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.018 away. White text reads best on it, at 11.43:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.83:1 |
| White text | 11.43:1 |
Values
| HEX | #173870 |
| RGB | rgb(23, 56, 112) |
| HSL | hsl(218, 66%, 26%) |
| OKLCH | oklch(35% 0.105 260.3) |
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 #173870 | 11.43:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #173870 | 1.83:1 | Fails | Lc 7.9 | Not readable |
| #173870 text on white | 11.43:1 | AAA | Lc 96.0 | Preferred for body text |
| #173870 text on black | 1.83:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF7
oklch(88.5% 0.044 261.2)
-
Step 300
300
#A4C2F4
oklch(81% 0.078 260.5)
-
Step 400
400
#72A1EE
oklch(70.8% 0.124 259.9)
-
Step 500
500
#4D87E9
oklch(63.2% 0.16 260.2)
-
Step 600
600
#306ED7
oklch(55.6% 0.174 260.3)
-
Step 700
700
#235BBB
oklch(49.1% 0.163 260.5)
-
Step 800
800
#1E4B97
oklch(42.7% 0.134 260.3)
-
Step 900
900 (this color)
#173870
oklch(35% 0.105 260.3)
-
Step 950
950
#122646
oklch(27.1% 0.065 259.4)
#173870 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) | #193E72 | 0.018 |
| Deuteranopia (no green cones) | #01366F | 0.017 |
| Tritanopia (no blue cones) | #00454E | 0.081 |
| Achromatopsia (no color) | #3A3A3A | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173870
#173870
oklch(35% 0.105 260.3)
- #4E3600
#4E3600
oklch(35.1% 0.073 81)
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 #173870, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.018
- Twilight Blue #0A437A ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.043
- Marine #042E60 ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.065
- Dark Grey Blue #29465B ΔE 0.067
- Cobalt #1E488F ΔE 0.068
- Midnight Green #073B4C ΔE 0.069
Use #173870 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.