#12458E
Closest named color: Cobalt (#1E488F). oklch(40.3% 0.132 258.5), rgb(18, 69, 142).
Aa
White text reads best on this color (9.26:1).
About this color
#12458E is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.132 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.013 away. White text reads best on it, at 9.26:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #12458E |
| RGB | rgb(18, 69, 142) |
| HSL | hsl(215, 78%, 31%) |
| OKLCH | oklch(40.3% 0.132 258.5) |
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 #12458E | 9.26:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #12458E | 2.26:1 | Fails | Lc 13.1 | Not readable |
| #12458E text on white | 9.26:1 | AAA | Lc 90.8 | Preferred for body text |
| #12458E text on black | 2.26:1 | Fails | Lc -11.5 | 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 800.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF6
oklch(88.6% 0.043 257.1)
-
Step 300
300
#A2C2F3
oklch(80.8% 0.078 258.8)
-
Step 400
400
#70A1ED
oklch(70.6% 0.124 258.9)
-
Step 500
500
#4988E7
oklch(63.1% 0.158 258.5)
-
Step 600
600
#2A6FD5
oklch(55.5% 0.172 258.6)
-
Step 700
700
#1C5DB9
oklch(49.2% 0.159 258.3)
-
Step 800
800 (this color)
#12458E
oklch(40.3% 0.132 258.5)
-
Step 900
900
#1B4077
oklch(37.6% 0.103 258.4)
-
Step 950
950
#112646
oklch(27% 0.066 258.6)
#12458E 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) | #164D91 | 0.023 |
| Deuteranopia (no green cones) | #00428D | 0.013 |
| Tritanopia (no blue cones) | #005762 | 0.102 |
| Achromatopsia (no color) | #474747 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12458E
#12458E
oklch(40.3% 0.132 258.5)
- #614200
#614200
oklch(40.4% 0.084 78.4)
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 #12458E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.013
- Twilight Blue #0A437A ΔE 0.034
- Light Navy #155084 ΔE 0.039
- Dusk Blue #26538D ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.051
- Sapphire #2138AB ΔE 0.058
- Blueberry #464196 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.063
Use #12458E 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.