#1B4489
Closest named color: Cobalt (#1E488F). oklch(39.9% 0.124 260.2), rgb(27, 68, 137).
Aa
White text reads best on this color (9.39:1).
About this color
#1B4489 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.124 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.015 away. White text reads best on it, at 9.39:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.23:1 |
| White text | 9.39:1 |
Values
| HEX | #1B4489 |
| RGB | rgb(27, 68, 137) |
| HSL | hsl(218, 67%, 32%) |
| OKLCH | oklch(39.9% 0.124 260.2) |
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 #1B4489 | 9.39:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #1B4489 | 2.23:1 | Fails | Lc 12.7 | Not readable |
| #1B4489 text on white | 9.39:1 | AAA | Lc 91.3 | Preferred for body text |
| #1B4489 text on black | 2.23:1 | Fails | Lc -11.1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9EC2FD
oklch(80.9% 0.093 260.1)
-
Step 400
400
#689FFD
oklch(70.6% 0.15 260.5)
-
Step 500
500
#3E84FA
oklch(63.1% 0.19 260.2)
-
Step 600
600
#1B6AE9
oklch(55.6% 0.206 260.2)
-
Step 700
700
#0C57CB
oklch(49.1% 0.193 260.2)
-
Step 800
800
#0F48A4
oklch(42.7% 0.159 260.2)
-
Step 900
900 (this color)
#1B4489
oklch(39.9% 0.124 260.2)
-
Step 950
950
#0D254C
oklch(27% 0.078 259.7)
#1B4489 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) | #1B4C8C | 0.023 |
| Deuteranopia (no green cones) | #004288 | 0.017 |
| Tritanopia (no blue cones) | #005560 | 0.097 |
| Achromatopsia (no color) | #464646 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4489
#1B4489
oklch(39.9% 0.124 260.2)
- #5E4200
#5E4200
oklch(40% 0.083 81.2)
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 #1B4489, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.015
- Twilight Blue #0A437A ΔE 0.028
- Light Navy #155084 ΔE 0.037
- Dusk Blue #26538D ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.050
- Blueberry #464196 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.058
- Sapphire #2138AB ΔE 0.064
Use #1B4489 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.