#243B3C
Closest named color: Onyx (#343A40). oklch(33.4% 0.029 199.3), rgb(36, 59, 60).
Aa
White text reads best on this color (11.89:1).
About this color
#243B3C is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.025 away. White text reads best on it, at 11.89:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.76:1 |
| White text | 11.89:1 |
Values
| HEX | #243B3C |
| RGB | rgb(36, 59, 60) |
| HSL | hsl(183, 25%, 19%) |
| OKLCH | oklch(33.4% 0.029 199.3) |
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 #243B3C | 11.89:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #243B3C | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #243B3C text on white | 11.89:1 | AAA | Lc 97.2 | Preferred for body text |
| #243B3C text on black | 1.76:1 | 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 900.
-
Step 50
50
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEB
oklch(93.6% 0.006 197)
-
Step 200
200
#D1DCDC
oklch(88.6% 0.012 196.9)
-
Step 300
300
#B1C5C6
oklch(80.9% 0.022 200.4)
-
Step 400
400
#88A8A9
oklch(70.8% 0.035 198.7)
-
Step 500
500
#6A9294
oklch(63.1% 0.044 200)
-
Step 600
600
#517C7E
oklch(55.6% 0.048 199.6)
-
Step 700
700
#41696A
oklch(49.2% 0.045 197.8)
-
Step 800
800
#365557
oklch(42.6% 0.037 201)
-
Step 900
900 (this color)
#243B3C
oklch(33.4% 0.029 199.3)
-
Step 950
950
#1C292A
oklch(26.9% 0.018 202.1)
#243B3C 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) | #38393C | 0.030 |
| Deuteranopia (no green cones) | #34363C | 0.027 |
| Tritanopia (no blue cones) | #1B3D3B | 0.012 |
| Achromatopsia (no color) | #373737 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243B3C
#243B3C
oklch(33.4% 0.029 199.3)
- #443030
#443030
oklch(33.2% 0.029 18.7)
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 #243B3C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.031
- Gunmetal #293241 ΔE 0.035
- Midnight Green #073B4C ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.043
- Charcoal #264653 ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.052
- Pakistan Green #283618 ΔE 0.055
Use #243B3C 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.