#174588
Closest named color: Cobalt (#1E488F). oklch(39.9% 0.123 258.4), rgb(23, 69, 136).
Aa
White text reads best on this color (9.36:1).
About this color
#174588 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.123 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.016 away. White text reads best on it, at 9.36:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.24:1 |
| White text | 9.36:1 |
Values
| HEX | #174588 |
| RGB | rgb(23, 69, 136) |
| HSL | hsl(216, 71%, 31%) |
| OKLCH | oklch(39.9% 0.123 258.4) |
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 #174588 | 9.36:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #174588 | 2.24:1 | Fails | Lc 12.8 | Not readable |
| #174588 text on white | 9.36:1 | AAA | Lc 91.2 | Preferred for body text |
| #174588 text on black | 2.24:1 | Fails | Lc -11.2 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFC
oklch(88.6% 0.051 258.4)
-
Step 300
300
#9CC3FC
oklch(81% 0.091 257.8)
-
Step 400
400
#65A1FB
oklch(70.8% 0.147 258.3)
-
Step 500
500
#3786F8
oklch(63.2% 0.187 258.2)
-
Step 600
600
#096CE7
oklch(55.6% 0.203 258.3)
-
Step 700
700
#005AC7
oklch(49.2% 0.185 258.3)
-
Step 800
800
#0449A3
oklch(42.6% 0.158 258.6)
-
Step 900
900 (this color)
#174588
oklch(39.9% 0.123 258.4)
-
Step 950
950
#0B254C
oklch(27% 0.079 258.6)
#174588 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) | #1F4C8A | 0.022 |
| Deuteranopia (no green cones) | #004287 | 0.016 |
| Tritanopia (no blue cones) | #005560 | 0.093 |
| Achromatopsia (no color) | #474747 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #174588
#174588
oklch(39.9% 0.123 258.4)
- #604100
#604100
oklch(40% 0.083 78.1)
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 #174588, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.016
- Twilight Blue #0A437A ΔE 0.026
- Light Navy #155084 ΔE 0.034
- Dusk Blue #26538D ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.047
- Blueberry #464196 ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.061
- Marine Blue #01386A ΔE 0.065
Use #174588 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.