#1B4666
Closest named color: Dark Grey Blue (#29465B). oklch(38% 0.072 244), rgb(27, 70, 102).
Aa
White text reads best on this color (9.93:1).
About this color
#1B4666 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.072 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.022 away. White text reads best on it, at 9.93:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.11:1 |
| White text | 9.93:1 |
Values
| HEX | #1B4666 |
| RGB | rgb(27, 70, 102) |
| HSL | hsl(206, 58%, 25%) |
| OKLCH | oklch(38% 0.072 244) |
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 #1B4666 | 9.93:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #1B4666 | 2.11:1 | Fails | Lc 11.1 | Not readable |
| #1B4666 text on white | 9.93:1 | AAA | Lc 92.8 | Preferred for body text |
| #1B4666 text on black | 2.11:1 | Fails | Lc -9.6 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A3C5E2
oklch(80.8% 0.055 244.3)
-
Step 400
400
#70A7D3
oklch(70.7% 0.087 243.6)
-
Step 500
500
#4790C8
oklch(63.1% 0.112 244.1)
-
Step 600
600
#2479B4
oklch(55.5% 0.121 244.1)
-
Step 700
700
#15669B
oklch(49.1% 0.112 243.8)
-
Step 800
800
#16537E
oklch(42.7% 0.093 244.4)
-
Step 900
900 (this color)
#1B4666
oklch(38% 0.072 244)
-
Step 950
950
#11293B
oklch(27.1% 0.045 243.2)
#1B4666 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) | #384767 | 0.034 |
| Deuteranopia (no green cones) | #2D4065 | 0.024 |
| Tritanopia (no blue cones) | #004E51 | 0.053 |
| Achromatopsia (no color) | #434343 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4666
#1B4666
oklch(38% 0.072 244)
- #5D3913
#5D3913
oklch(38% 0.072 63.6)
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 #1B4666, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.022
- Charcoal #264653 ΔE 0.034
- Twilight Blue #0A437A ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.049
- Marine Blue #01386A ΔE 0.052
- Light Navy #155084 ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.055
- Dark Teal #014D4E ΔE 0.056
Use #1B4666 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.