#173977
Closest named color: Marine Blue (#01386A). oklch(35.8% 0.114 261.2), rgb(23, 57, 119).
Aa
White text reads best on this color (11.12:1).
About this color
#173977 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.114 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.028 away. White text reads best on it, at 11.12:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.88:1 |
| White text | 11.12:1 |
Values
| HEX | #173977 |
| RGB | rgb(23, 57, 119) |
| HSL | hsl(219, 68%, 28%) |
| OKLCH | oklch(35.8% 0.114 261.2) |
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 #173977 | 11.12:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #173977 | 1.88:1 | Fails | Lc 8.6 | Not readable |
| #173977 text on white | 11.12:1 | AAA | Lc 95.3 | Preferred for body text |
| #173977 text on black | 1.88:1 | Fails | Lc -7.3 | 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
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A2C2F8
oklch(81% 0.084 260.7)
-
Step 400
400
#6FA0F5
oklch(70.8% 0.136 260.8)
-
Step 500
500
#4985F1
oklch(63.1% 0.174 261.1)
-
Step 600
600
#2C6BE0
oklch(55.5% 0.19 261.4)
-
Step 700
700
#1F59C2
oklch(49.1% 0.175 261.2)
-
Step 800
800
#1B499D
oklch(42.6% 0.146 261.2)
-
Step 900
900 (this color)
#173977
oklch(35.8% 0.114 261.2)
-
Step 950
950
#112549
oklch(27% 0.072 261.1)
#173977 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) | #134079 | 0.020 |
| Deuteranopia (no green cones) | #003776 | 0.017 |
| Tritanopia (no blue cones) | #004852 | 0.089 |
| Achromatopsia (no color) | #3B3B3B | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173977
#173977
oklch(35.8% 0.114 261.2)
- #503800
#503800
oklch(35.9% 0.074 81.7)
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 #173977, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.028
- Twilight Blue #0A437A ΔE 0.029
- Marine #042E60 ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.055
- Cobalt #1E488F ΔE 0.057
- Light Navy #155084 ΔE 0.069
- Dark Grey Blue #29465B ΔE 0.072
- Dark Blue Grey #1F3B4D ΔE 0.075
Use #173977 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.