#1B4083
Closest named color: Twilight Blue (#0A437A). oklch(38.5% 0.121 261.1), rgb(27, 64, 131).
Aa
White text reads best on this color (9.96:1).
About this color
#1B4083 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.121 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.021 away. White text reads best on it, at 9.96:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.10:1 |
| White text | 9.96:1 |
Values
| HEX | #1B4083 |
| RGB | rgb(27, 64, 131) |
| HSL | hsl(219, 66%, 31%) |
| OKLCH | oklch(38.5% 0.121 261.1) |
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 #1B4083 | 9.96:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #1B4083 | 2.10:1 | Fails | Lc 11.2 | Not readable |
| #1B4083 text on white | 9.96:1 | AAA | Lc 92.7 | Preferred for body text |
| #1B4083 text on black | 2.10:1 | Fails | Lc -9.7 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFB
oklch(88.5% 0.05 261.5)
-
Step 300
300
#A0C2FC
oklch(81% 0.09 260.9)
-
Step 400
400
#6C9FFA
oklch(70.7% 0.145 261.3)
-
Step 500
500
#4484F7
oklch(63.1% 0.184 261)
-
Step 600
600
#256AE6
oklch(55.6% 0.201 261.1)
-
Step 700
700
#1857C8
oklch(49% 0.187 261.2)
-
Step 800
800
#1648A2
oklch(42.7% 0.155 261.1)
-
Step 900
900 (this color)
#1B4083
oklch(38.5% 0.121 261.1)
-
Step 950
950
#0F254B
oklch(27% 0.076 260.5)
#1B4083 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) | #184885 | 0.023 |
| Deuteranopia (no green cones) | #003E82 | 0.018 |
| Tritanopia (no blue cones) | #00505B | 0.094 |
| Achromatopsia (no color) | #434343 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4083
#1B4083
oklch(38.5% 0.121 261.1)
- #593E00
#593E00
oklch(38.4% 0.079 80.8)
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 #1B4083, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.021
- Cobalt #1E488F ΔE 0.029
- Light Navy #155084 ΔE 0.046
- Marine Blue #01386A ΔE 0.053
- Dusk Blue #26538D ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.061
- Blueberry #464196 ΔE 0.064
Use #1B4083 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.