#231B28
Closest named color: Dark (#1B2431). oklch(23.8% 0.027 312.2), rgb(35, 27, 40).
Aa
White text reads best on this color (16.68:1).
About this color
#231B28 is a very dark close to neutral grey. In OKLCH its lightness is 24%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Dark (#1B2431), ΔE 0.032 away. White text reads best on it, at 16.68:1.
| Hue family | Neutrals |
| Lightness | very dark (24%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Dark (#1B2431) |
| Black text | 1.25:1 |
| White text | 16.68:1 |
Values
| HEX | #231B28 |
| RGB | rgb(35, 27, 40) |
| HSL | hsl(277, 19%, 13%) |
| OKLCH | oklch(23.8% 0.027 312.2) |
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 #231B28 | 16.68:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #231B28 | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #231B28 text on white | 16.68:1 | AAA | Lc 103.6 | Preferred for body text |
| #231B28 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
#DDD6E2
oklch(88.5% 0.018 311.6)
-
Step 300
300
#C8BBD0
oklch(80.9% 0.032 312.8)
-
Step 400
400
#AB98B8
oklch(70.7% 0.051 311.6)
-
Step 500
500
#977EA6
oklch(63% 0.065 312.6)
-
Step 600
600
#816792
oklch(55.5% 0.072 311.6)
-
Step 700
700
#6D567C
oklch(49.1% 0.065 311.6)
-
Step 800
800
#594665
oklch(42.6% 0.055 311.9)
-
Step 900
900
#493B52
oklch(37.6% 0.042 311.9)
-
Step 950
950 (this color)
#231B28
oklch(23.8% 0.027 312.2)
#231B28 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) | #191E29 | 0.020 |
| Deuteranopia (no green cones) | #1B1E28 | 0.018 |
| Tritanopia (no blue cones) | #231D20 | 0.019 |
| Achromatopsia (no color) | #1E1E1E | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231B28
#231B28
oklch(23.8% 0.027 312.2)
- #1A2114
#1A2114
oklch(23.6% 0.026 131.2)
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 #231B28, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.032
- Jet #212529 ΔE 0.035
- Rich Black #0D1B2A ΔE 0.038
- Oxford Blue #1B263B ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.071
- Eggplant #380835 ΔE 0.071
- Dark Brown #341C02 ΔE 0.071
- Aubergine #3D0734 ΔE 0.077
Use #231B28 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.