#1B4085
Closest named color: Twilight Blue (#0A437A). oklch(38.7% 0.124 261.5), rgb(27, 64, 133).
Aa
White text reads best on this color (9.91:1).
About this color
#1B4085 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.124 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.024 away. White text reads best on it, at 9.91:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.11:1 |
| White text | 9.91:1 |
Values
| HEX | #1B4085 |
| RGB | rgb(27, 64, 133) |
| HSL | hsl(219, 66%, 31%) |
| OKLCH | oklch(38.7% 0.124 261.5) |
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 #1B4085 | 9.91:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #1B4085 | 2.11:1 | Fails | Lc 11.4 | Not readable |
| #1B4085 text on white | 9.91:1 | AAA | Lc 92.6 | Preferred for body text |
| #1B4085 text on black | 2.11:1 | Fails | Lc -9.9 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFC
oklch(88.5% 0.051 262.1)
-
Step 300
300
#9FC1FD
oklch(80.8% 0.093 261.6)
-
Step 400
400
#6B9FFC
oklch(70.7% 0.148 261.3)
-
Step 500
500
#4383FA
oklch(63.1% 0.19 261.5)
-
Step 600
600
#2469E9
oklch(55.6% 0.206 261.4)
-
Step 700
700
#1756CB
oklch(49.1% 0.192 261.5)
-
Step 800
800
#1647A4
oklch(42.6% 0.159 261.6)
-
Step 900
900 (this color)
#1B4085
oklch(38.7% 0.124 261.5)
-
Step 950
950
#0F244C
oklch(26.9% 0.079 261.8)
#1B4085 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) | #154888 | 0.022 |
| Deuteranopia (no green cones) | #003E84 | 0.018 |
| Tritanopia (no blue cones) | #00515C | 0.097 |
| Achromatopsia (no color) | #434343 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4085
#1B4085
oklch(38.7% 0.124 261.5)
- #5A3F00
#5A3F00
oklch(38.8% 0.08 81.1)
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 #1B4085, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.024
- Cobalt #1E488F ΔE 0.027
- Light Navy #155084 ΔE 0.047
- Marine Blue #01386A ΔE 0.055
- Dusk Blue #26538D ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.060
- Blueberry #464196 ΔE 0.063
Use #1B4085 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.