#12558B
Closest named color: Dusk Blue (#26538D). oklch(43.9% 0.109 248.5), rgb(18, 85, 139).
Aa
White text reads best on this color (7.78:1).
About this color
#12558B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.109 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.014 away. White text reads best on it, at 7.78:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.69:1 |
| White text | 7.78:1 |
Values
| HEX | #12558B |
| RGB | rgb(18, 85, 139) |
| HSL | hsl(207, 77%, 31%) |
| OKLCH | oklch(43.9% 0.109 248.5) |
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 #12558B | 7.78:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #12558B | 2.69:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #12558B text on white | 7.78:1 | AAA | Lc 86.6 | Fine for body text |
| #12558B text on black | 2.69:1 | Fails | Lc -15.5 | Dividers and decoration only |
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 800.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A1C5E9
oklch(81% 0.064 248.6)
-
Step 400
400
#6CA6DD
oklch(70.7% 0.101 248.2)
-
Step 500
500
#408ED4
oklch(63% 0.131 248.5)
-
Step 600
600
#1877C2
oklch(55.6% 0.142 248.7)
-
Step 700
700
#0464A7
oklch(49.2% 0.131 248.3)
-
Step 800
800 (this color)
#12558B
oklch(43.9% 0.109 248.5)
-
Step 900
900
#15446C
oklch(37.7% 0.085 248.2)
-
Step 950
950
#0E283F
oklch(26.9% 0.054 248)
#12558B 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) | #3B588D | 0.037 |
| Deuteranopia (no green cones) | #284D8A | 0.025 |
| Tritanopia (no blue cones) | #006269 | 0.079 |
| Achromatopsia (no color) | #525252 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12558B
#12558B
oklch(43.9% 0.109 248.5)
- #744600
#744600
oklch(43.8% 0.096 68)
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 #12558B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.014
- Deep Sea Blue #015482 ΔE 0.017
- Light Navy #155084 ΔE 0.017
- Light Navy Blue #2E5A88 ΔE 0.028
- Cobalt #1E488F ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.043
- Peacock Blue #016795 ΔE 0.053
- YInMn Blue #415A77 ΔE 0.057
Use #12558B 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.