#1B2431
Named color: Dark. oklch(25.8% 0.028 257.5), rgb(27, 36, 49).
Aa
White text reads best on this color (15.63:1).
About this color
#1B2431 is a dark close to neutral grey. In OKLCH its lightness is 26%, its chroma 0.028. It has too little chroma to lean warm or cool. It is the named color Dark. White text reads best on it, at 15.63:1.
| Hue family | Neutrals |
| Lightness | dark (26%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Dark |
| Black text | 1.34:1 |
| White text | 15.63:1 |
Values
| HEX | #1B2431 |
| RGB | rgb(27, 36, 49) |
| HSL | hsl(215, 29%, 15%) |
| OKLCH | oklch(25.8% 0.028 257.5) |
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 #1B2431 | 15.63:1 | AAA | Lc -105.2 | Preferred for body text |
| Black text on #1B2431 | 1.34:1 | Fails | Lc 0.0 | Not readable |
| #1B2431 text on white | 15.63:1 | AAA | Lc 102.6 | Preferred for body text |
| #1B2431 text on black | 1.34:1 | 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 950.
-
Step 50
50
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D2DAE5
oklch(88.6% 0.017 256.3)
-
Step 300
300
#B4C2D6
oklch(81% 0.032 257.2)
-
Step 400
400
#8CA2C2
oklch(70.7% 0.053 257.7)
-
Step 500
500
#708BB2
oklch(63.1% 0.067 257.5)
-
Step 600
600
#58759E
oklch(55.7% 0.073 257.1)
-
Step 700
700
#486287
oklch(49.1% 0.067 257.2)
-
Step 800
800
#3B506E
oklch(42.7% 0.057 257.3)
-
Step 900
900
#334259
oklch(37.6% 0.044 258.8)
-
Step 950
950 (this color)
#1B2431
oklch(25.8% 0.028 257.5)
#1B2431 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) | #1F2532 | 0.008 |
| Deuteranopia (no green cones) | #1D2231 | 0.007 |
| Tritanopia (no blue cones) | #142728 | 0.026 |
| Achromatopsia (no color) | #232323 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2431
#1B2431
oklch(25.8% 0.028 257.5)
- #2B2214
#2B2214
oklch(25.8% 0.028 78.1)
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 #1B2431, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.019
- Jet #212529 ΔE 0.019
- Rich Black #0D1B2A ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.050
- Gunmetal #293241 ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.080
- Midnight Green #073B4C ΔE 0.081
- Dark Brown #341C02 ΔE 0.082
Use #1B2431 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.