#1B487E
Closest named color: Twilight Blue (#0A437A). oklch(40.1% 0.103 255), rgb(27, 72, 126).
Aa
White text reads best on this color (9.23:1).
About this color
#1B487E is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.103 and its hue 255°. 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 9.23:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #1B487E |
| RGB | rgb(27, 72, 126) |
| HSL | hsl(213, 65%, 30%) |
| OKLCH | oklch(40.1% 0.103 255) |
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 #1B487E | 9.23:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #1B487E | 2.27:1 | Fails | Lc 13.0 | Not readable |
| #1B487E text on white | 9.23:1 | AAA | Lc 91.0 | Preferred for body text |
| #1B487E text on black | 2.27:1 | Fails | Lc -11.4 | 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
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#9FC4F3
oklch(81% 0.078 254.6)
-
Step 400
400
#69A3EC
oklch(70.6% 0.124 254.8)
-
Step 500
500
#3D8AE7
oklch(63.1% 0.159 255)
-
Step 600
600
#1572D5
oklch(55.7% 0.172 254.9)
-
Step 700
700
#025FB8
oklch(49.2% 0.159 254.7)
-
Step 800
800
#0A4E95
oklch(42.7% 0.132 254.7)
-
Step 900
900 (this color)
#1B487E
oklch(40.1% 0.103 255)
-
Step 950
950
#0D2746
oklch(27.1% 0.066 254.6)
#1B487E 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) | #2E4C80 | 0.024 |
| Deuteranopia (no green cones) | #1D437D | 0.014 |
| Tritanopia (no blue cones) | #00555D | 0.079 |
| Achromatopsia (no color) | #474747 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B487E
#1B487E
oklch(40.1% 0.103 255)
- #624000
#624000
oklch(40.1% 0.085 75)
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 #1B487E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.021
- Light Navy #155084 ΔE 0.024
- Cobalt #1E488F ΔE 0.029
- Deep Sea Blue #015482 ΔE 0.035
- Dusk Blue #26538D ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.059
- Light Navy Blue #2E5A88 ΔE 0.060
- Marine Blue #01386A ΔE 0.061
Use #1B487E 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.