#1C4582
Closest named color: Twilight Blue (#0A437A). oklch(39.7% 0.113 258.5), rgb(28, 69, 130).
Aa
White text reads best on this color (9.44:1).
About this color
#1C4582 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.113 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.020 away. White text reads best on it, at 9.44:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.22:1 |
| White text | 9.44:1 |
Values
| HEX | #1C4582 |
| RGB | rgb(28, 69, 130) |
| HSL | hsl(216, 65%, 31%) |
| OKLCH | oklch(39.7% 0.113 258.5) |
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 #1C4582 | 9.44:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #1C4582 | 2.22:1 | Fails | Lc 12.5 | Not readable |
| #1C4582 text on white | 9.44:1 | AAA | Lc 91.5 | Preferred for body text |
| #1C4582 text on black | 2.22:1 | Fails | Lc -10.9 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DBF9
oklch(88.6% 0.047 258.4)
-
Step 300
300
#9FC2F7
oklch(80.8% 0.084 258.5)
-
Step 400
400
#6AA1F4
oklch(70.7% 0.136 258.4)
-
Step 500
500
#4187F0
oklch(63.2% 0.173 258.5)
-
Step 600
600
#1E6EDE
oklch(55.7% 0.187 258.4)
-
Step 700
700
#0F5BC1
oklch(49.1% 0.174 258.4)
-
Step 800
800
#114B9C
oklch(42.7% 0.144 258.4)
-
Step 900
900 (this color)
#1C4582
oklch(39.7% 0.113 258.5)
-
Step 950
950
#0E2649
oklch(27.1% 0.072 258)
#1C4582 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) | #254B84 | 0.021 |
| Deuteranopia (no green cones) | #0F4281 | 0.014 |
| Tritanopia (no blue cones) | #00535D | 0.086 |
| Achromatopsia (no color) | #464646 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C4582
#1C4582
oklch(39.7% 0.113 258.5)
- #5F4000
#5F4000
oklch(39.7% 0.083 77.7)
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 #1C4582, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.020
- Cobalt #1E488F ΔE 0.023
- Light Navy #155084 ΔE 0.032
- Deep Sea Blue #015482 ΔE 0.044
- Dusk Blue #26538D ΔE 0.045
- Marine Blue #01386A ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.060
- Blueberry #464196 ΔE 0.063
Use #1C4582 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.