#1B4479
Closest named color: Twilight Blue (#0A437A). oklch(38.7% 0.101 256.2), rgb(27, 68, 121).
Aa
White text reads best on this color (9.76:1).
About this color
#1B4479 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.101 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.012 away. White text reads best on it, at 9.76:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.14:1 |
| White text | 9.76:1 |
Values
| HEX | #1B4479 |
| RGB | rgb(27, 68, 121) |
| HSL | hsl(214, 64%, 29%) |
| OKLCH | oklch(38.7% 0.101 256.2) |
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 #1B4479 | 9.76:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #1B4479 | 2.14:1 | Fails | Lc 11.6 | Not readable |
| #1B4479 text on white | 9.76:1 | AAA | Lc 92.3 | Preferred for body text |
| #1B4479 text on black | 2.14:1 | Fails | Lc -10.1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A1C3F2
oklch(80.9% 0.076 256.6)
-
Step 400
400
#6DA3EB
oklch(70.8% 0.121 256)
-
Step 500
500
#4489E5
oklch(63% 0.156 256.5)
-
Step 600
600
#2171D3
oklch(55.6% 0.169 256.2)
-
Step 700
700
#125EB7
oklch(49.1% 0.157 256.2)
-
Step 800
800
#134D94
oklch(42.6% 0.13 256.3)
-
Step 900
900 (this color)
#1B4479
oklch(38.7% 0.101 256.2)
-
Step 950
950
#0F2745
oklch(27.1% 0.064 255.3)
#1B4479 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) | #2A487B | 0.021 |
| Deuteranopia (no green cones) | #1A4078 | 0.012 |
| Tritanopia (no blue cones) | #005058 | 0.078 |
| Achromatopsia (no color) | #444444 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4479
#1B4479
oklch(38.7% 0.101 256.2)
- #5D3D00
#5D3D00
oklch(38.7% 0.081 75.6)
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 #1B4479, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.012
- Light Navy #155084 ΔE 0.037
- Cobalt #1E488F ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.047
- Marine Blue #01386A ΔE 0.048
- Dusk Blue #26538D ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.055
- Charcoal #264653 ΔE 0.068
Use #1B4479 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.