#1B4889
Closest named color: Cobalt (#1E488F). oklch(40.8% 0.119 258.1), rgb(27, 72, 137).
Aa
White text reads best on this color (8.99:1).
About this color
#1B4889 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.119 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.010 away. White text reads best on it, at 8.99:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.33:1 |
| White text | 8.99:1 |
Values
| HEX | #1B4889 |
| RGB | rgb(27, 72, 137) |
| HSL | hsl(215, 67%, 32%) |
| OKLCH | oklch(40.8% 0.119 258.1) |
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 #1B4889 | 8.99:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #1B4889 | 2.33:1 | Fails | Lc 13.7 | Not readable |
| #1B4889 text on white | 8.99:1 | AAA | Lc 90.3 | Preferred for body text |
| #1B4889 text on black | 2.33:1 | Fails | Lc -12.0 | 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 800.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF8
oklch(93.7% 0.02 257.5)
-
Step 200
200
#CADAF3
oklch(88.4% 0.039 259.3)
-
Step 300
300
#A5C2EE
oklch(80.8% 0.07 258.6)
-
Step 400
400
#74A2E6
oklch(70.7% 0.112 258)
-
Step 500
500
#5089DE
oklch(63.1% 0.142 258.2)
-
Step 600
600
#3371CC
oklch(55.6% 0.155 258.2)
-
Step 700
700
#255EB0
oklch(49% 0.144 258.1)
-
Step 800
800 (this color)
#1B4889
oklch(40.8% 0.119 258.1)
-
Step 900
900
#204172
oklch(37.7% 0.093 258.2)
-
Step 950
950
#132643
oklch(26.9% 0.06 258.6)
#1B4889 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) | #254E8B | 0.021 |
| Deuteranopia (no green cones) | #094488 | 0.017 |
| Tritanopia (no blue cones) | #005762 | 0.090 |
| Achromatopsia (no color) | #494949 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4889
#1B4889
oklch(40.8% 0.119 258.1)
- #634300
#634300
oklch(40.9% 0.085 77.9)
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 #1B4889, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.010
- Light Navy #155084 ΔE 0.026
- Twilight Blue #0A437A ΔE 0.031
- Dusk Blue #26538D ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.039
- Blueberry #464196 ΔE 0.058
- Light Navy Blue #2E5A88 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.059
Use #1B4889 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.