#1B4243
Closest named color: Charcoal (#264653). oklch(35.2% 0.044 197.6), rgb(27, 66, 67).
Aa
White text reads best on this color (11.01:1).
About this color
#1B4243 is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.044 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.032 away. White text reads best on it, at 11.01:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 1.90:1 |
| White text | 11.01:1 |
Values
| HEX | #1B4243 |
| RGB | rgb(27, 66, 67) |
| HSL | hsl(182, 43%, 18%) |
| OKLCH | oklch(35.2% 0.044 197.6) |
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 #1B4243 | 11.01:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #1B4243 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #1B4243 text on white | 11.01:1 | AAA | Lc 95.3 | Preferred for body text |
| #1B4243 text on black | 1.90:1 | Fails | Lc -7.3 | 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
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEC
oklch(93.6% 0.01 197)
-
Step 200
200
#CCDDDD
oklch(88.5% 0.018 196.8)
-
Step 300
300
#A9C8C8
oklch(81% 0.033 196.5)
-
Step 400
400
#79ABAC
oklch(70.6% 0.053 197.6)
-
Step 500
500
#549698
oklch(63% 0.068 198.1)
-
Step 600
600
#368182
oklch(55.7% 0.074 196.5)
-
Step 700
700
#276D6E
oklch(49.2% 0.069 196.5)
-
Step 800
800
#23585A
oklch(42.6% 0.056 198.7)
-
Step 900
900 (this color)
#1B4243
oklch(35.2% 0.044 197.6)
-
Step 950
950
#152B2B
oklch(27.1% 0.028 195.6)
#1B4243 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) | #3E3F43 | 0.046 |
| Deuteranopia (no green cones) | #373A43 | 0.042 |
| Tritanopia (no blue cones) | #004442 | 0.017 |
| Achromatopsia (no color) | #3C3C3C | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4243
#1B4243
oklch(35.2% 0.044 197.6)
- #503132
#503132
oklch(35.1% 0.045 17.5)
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 #1B4243, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.034
- Dark Teal #014D4E ΔE 0.036
- Midnight Green #073B4C ΔE 0.037
- Onyx #343A40 ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.046
- Dark Slate Gray #2F4F4F ΔE 0.052
Use #1B4243 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.