#1B3C4E
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34% 0.05 234.7), rgb(27, 60, 78).
Aa
White text reads best on this color (11.64:1).
About this color
#1B3C4E is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.050 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.005 away. White text reads best on it, at 11.64:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.80:1 |
| White text | 11.64:1 |
Values
| HEX | #1B3C4E |
| RGB | rgb(27, 60, 78) |
| HSL | hsl(201, 49%, 21%) |
| OKLCH | oklch(34% 0.05 234.7) |
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 #1B3C4E | 11.64:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #1B3C4E | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #1B3C4E text on white | 11.64:1 | AAA | Lc 96.6 | Preferred for body text |
| #1B3C4E text on black | 1.80:1 | Fails | Lc 0.0 | 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 900.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CDDCE5
oklch(88.6% 0.02 233.9)
-
Step 300
300
#AAC5D6
oklch(80.9% 0.038 235.6)
-
Step 400
400
#7CA7C1
oklch(70.7% 0.06 235.3)
-
Step 500
500
#5991B1
oklch(63.1% 0.076 234.8)
-
Step 600
600
#3C7B9D
oklch(55.6% 0.084 234.6)
-
Step 700
700
#2E6886
oklch(49.2% 0.077 233.9)
-
Step 800
800
#27556D
oklch(42.8% 0.064 233.8)
-
Step 900
900 (this color)
#1B3C4E
oklch(34% 0.05 234.7)
-
Step 950
950
#162934
oklch(27% 0.032 235.1)
#1B3C4E 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) | #333B4F | 0.031 |
| Deuteranopia (no green cones) | #2C364E | 0.027 |
| Tritanopia (no blue cones) | #004142 | 0.036 |
| Achromatopsia (no color) | #383838 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3C4E
#1B3C4E
oklch(34% 0.05 234.7)
- #4C311E
#4C311E
oklch(34.1% 0.05 55.3)
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 #1B3C4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.005
- Midnight Green #073B4C ΔE 0.016
- Prussian Blue #1D3557 ΔE 0.031
- Gunmetal #293241 ΔE 0.036
- Charcoal #264653 ΔE 0.037
- Onyx #343A40 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.050
Use #1B3C4E 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.