#1B4451
Closest named color: Charcoal (#264653). oklch(36.4% 0.051 221.7), rgb(27, 68, 81).
Aa
White text reads best on this color (10.54:1).
About this color
#1B4451 is a dark, muted teal or cyan. In OKLCH its lightness is 36%, its chroma 0.051 and its hue 222°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.014 away. White text reads best on it, at 10.54:1.
| Hue family | Teals and cyans |
| Lightness | dark (36%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 1.99:1 |
| White text | 10.54:1 |
Values
| HEX | #1B4451 |
| RGB | rgb(27, 68, 81) |
| HSL | hsl(194, 50%, 21%) |
| OKLCH | oklch(36.4% 0.051 221.7) |
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 #1B4451 | 10.54:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #1B4451 | 1.99:1 | Fails | Lc 9.6 | Not readable |
| #1B4451 text on white | 10.54:1 | AAA | Lc 94.3 | Preferred for body text |
| #1B4451 text on black | 1.99:1 | Fails | Lc -8.3 | 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
#E2ECEF
oklch(93.6% 0.011 217.5)
-
Step 200
200
#CBDDE3
oklch(88.6% 0.021 219.7)
-
Step 300
300
#A7C7D2
oklch(81% 0.038 220.6)
-
Step 400
400
#76AABC
oklch(70.8% 0.061 221.5)
-
Step 500
500
#4F94AB
oklch(63% 0.078 222)
-
Step 600
600
#2F7E96
oklch(55.5% 0.084 221.6)
-
Step 700
700
#206A80
oklch(49% 0.078 221.9)
-
Step 800
800
#1D5768
oklch(42.7% 0.065 220.9)
-
Step 900
900 (this color)
#1B4451
oklch(36.4% 0.051 221.7)
-
Step 950
950
#132A32
oklch(27% 0.033 222.8)
#1B4451 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) | #3C4252 | 0.041 |
| Deuteranopia (no green cones) | #353C51 | 0.038 |
| Tritanopia (no blue cones) | #004848 | 0.029 |
| Achromatopsia (no color) | #3F3F3F | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4451
#1B4451
oklch(36.4% 0.051 221.7)
- #553529
#553529
oklch(36.4% 0.051 41.3)
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 #1B4451, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.014
- Dark Grey Blue #29465B ΔE 0.024
- Dark Blue Grey #1F3B4D ΔE 0.029
- Dark Teal #014D4E ΔE 0.034
- Midnight Green #073B4C ΔE 0.036
- Onyx #343A40 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.044
- Dark Slate Gray #2F4F4F ΔE 0.046
Use #1B4451 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.