#231B27
Closest named color: Dark (#1B2431). oklch(23.7% 0.025 314.3), rgb(35, 27, 39).
Aa
White text reads best on this color (16.69:1).
About this color
#231B27 is a very dark close to neutral grey. In OKLCH its lightness is 24%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Dark (#1B2431), ΔE 0.033 away. White text reads best on it, at 16.69:1.
| Hue family | Neutrals |
| Lightness | very dark (24%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Dark (#1B2431) |
| Black text | 1.25:1 |
| White text | 16.69:1 |
Values
| HEX | #231B27 |
| RGB | rgb(35, 27, 39) |
| HSL | hsl(280, 18%, 13%) |
| OKLCH | oklch(23.7% 0.025 314.3) |
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 #231B27 | 16.69:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #231B27 | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #231B27 text on white | 16.69:1 | AAA | Lc 103.6 | Preferred for body text |
| #231B27 text on black | 1.25:1 | 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
#F6F5F7
oklch(97.1% 0.003 308.4)
-
Step 100
100
#ECE8EE
oklch(93.6% 0.009 314.8)
-
Step 200
200
#DDD6E1
oklch(88.5% 0.017 313.6)
-
Step 300
300
#C8BBCE
oklch(80.9% 0.03 315.3)
-
Step 400
400
#AC98B6
oklch(70.7% 0.048 314.5)
-
Step 500
500
#977FA4
oklch(63.2% 0.061 313.6)
-
Step 600
600
#82688F
oklch(55.7% 0.066 314.2)
-
Step 700
700
#6E5679
oklch(49.1% 0.062 315)
-
Step 800
800
#594763
oklch(42.8% 0.051 313.3)
-
Step 900
900
#493B51
oklch(37.6% 0.041 313.1)
-
Step 950
950 (this color)
#231B27
oklch(23.7% 0.025 314.3)
#231B27 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) | #191D28 | 0.019 |
| Deuteranopia (no green cones) | #1B1E27 | 0.018 |
| Tritanopia (no blue cones) | #231C1F | 0.017 |
| Achromatopsia (no color) | #1E1E1E | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231B27
#231B27
oklch(23.7% 0.025 314.3)
- #1A2115
#1A2115
oklch(23.7% 0.024 132.6)
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 #231B27, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.033
- Jet #212529 ΔE 0.034
- Rich Black #0D1B2A ΔE 0.038
- Oxford Blue #1B263B ΔE 0.046
- Dark Brown #341C02 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.071
- Eggplant #380835 ΔE 0.072
- Aubergine #3D0734 ΔE 0.078
Use #231B27 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.