#1B4787
Closest named color: Cobalt (#1E488F). oklch(40.5% 0.118 258.2), rgb(27, 71, 135).
Aa
White text reads best on this color (9.13:1).
About this color
#1B4787 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.118 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.014 away. White text reads best on it, at 9.13:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.29:1 |
| White text | 9.13:1 |
Values
| HEX | #1B4787 |
| RGB | rgb(27, 71, 135) |
| HSL | hsl(216, 67%, 32%) |
| OKLCH | oklch(40.5% 0.118 258.2) |
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 #1B4787 | 9.13:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #1B4787 | 2.29:1 | Fails | Lc 13.3 | Not readable |
| #1B4787 text on white | 9.13:1 | AAA | Lc 90.7 | Preferred for body text |
| #1B4787 text on black | 2.29:1 | Fails | Lc -11.7 | 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
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADAF3
oklch(88.4% 0.039 259.3)
-
Step 300
300
#A6C2ED
oklch(80.8% 0.068 258.9)
-
Step 400
400
#75A2E5
oklch(70.7% 0.11 258.1)
-
Step 500
500
#5189DD
oklch(63.1% 0.14 258.3)
-
Step 600
600
#3471CB
oklch(55.6% 0.153 258.3)
-
Step 700
700
#275EAF
oklch(49% 0.142 258.4)
-
Step 800
800 (this color)
#1B4787
oklch(40.5% 0.118 258.2)
-
Step 900
900
#204171
oklch(37.7% 0.091 257.9)
-
Step 950
950
#142642
oklch(26.9% 0.058 258.9)
#1B4787 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) | #254D89 | 0.021 |
| Deuteranopia (no green cones) | #0A4386 | 0.017 |
| Tritanopia (no blue cones) | #005660 | 0.091 |
| Achromatopsia (no color) | #484848 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4787
#1B4787
oklch(40.5% 0.118 258.2)
- #614200
#614200
oklch(40.4% 0.084 78.4)
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 #1B4787, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.014
- Light Navy #155084 ΔE 0.028
- Twilight Blue #0A437A ΔE 0.028
- Dusk Blue #26538D ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.041
- Blueberry #464196 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.062
Use #1B4787 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.