#1B4880
Closest named color: Twilight Blue (#0A437A). oklch(40.2% 0.106 255.6), rgb(27, 72, 128).
Aa
White text reads best on this color (9.18:1).
About this color
#1B4880 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.106 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.022 away. White text reads best on it, at 9.18:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.28:1 |
| White text | 9.18:1 |
Values
| HEX | #1B4880 |
| RGB | rgb(27, 72, 128) |
| HSL | hsl(213, 65%, 30%) |
| OKLCH | oklch(40.2% 0.106 255.6) |
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 #1B4880 | 9.18:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #1B4880 | 2.28:1 | Fails | Lc 13.1 | Not readable |
| #1B4880 text on white | 9.18:1 | AAA | Lc 90.8 | Preferred for body text |
| #1B4880 text on black | 2.28:1 | Fails | Lc -11.5 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBF0
oklch(88.6% 0.034 255.2)
-
Step 300
300
#A7C3E9
oklch(80.9% 0.062 256.1)
-
Step 400
400
#76A3DE
oklch(70.7% 0.1 255.5)
-
Step 500
500
#528BD5
oklch(63.1% 0.127 255.6)
-
Step 600
600
#3574C2
oklch(55.7% 0.138 255.3)
-
Step 700
700
#2861A8
oklch(49.3% 0.128 255.6)
-
Step 800
800 (this color)
#1B4880
oklch(40.2% 0.106 255.6)
-
Step 900
900
#21426D
oklch(37.7% 0.084 255.9)
-
Step 950
950
#142740
oklch(27% 0.053 255.8)
#1B4880 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) | #2C4D82 | 0.024 |
| Deuteranopia (no green cones) | #1A437F | 0.015 |
| Tritanopia (no blue cones) | #00555D | 0.082 |
| Achromatopsia (no color) | #484848 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4880
#1B4880
oklch(40.2% 0.106 255.6)
- #624100
#624100
oklch(40.3% 0.085 76.3)
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 #1B4880, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.022
- Light Navy #155084 ΔE 0.023
- Cobalt #1E488F ΔE 0.026
- Deep Sea Blue #015482 ΔE 0.035
- Dusk Blue #26538D ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.063
- Marine Blue #01386A ΔE 0.063
Use #1B4880 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.