#243D3D
Closest named color: Onyx (#343A40). oklch(34% 0.031 195.8), rgb(36, 61, 61).
Aa
White text reads best on this color (11.60:1).
About this color
#243D3D is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.031 and its hue 196°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.026 away. White text reads best on it, at 11.60:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.80:1 |
| White text | 11.60:1 |
Values
| HEX | #243D3D |
| RGB | rgb(36, 61, 61) |
| HSL | hsl(180, 26%, 19%) |
| OKLCH | oklch(34% 0.031 195.8) |
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 #243D3D | 11.60:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #243D3D | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #243D3D text on white | 11.60:1 | AAA | Lc 96.6 | Preferred for body text |
| #243D3D text on black | 1.80:1 | 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
#D0DCDC
oklch(88.5% 0.013 196.9)
-
Step 300
300
#B0C6C5
oklch(81% 0.024 193.4)
-
Step 400
400
#86A8A8
oklch(70.6% 0.037 196.3)
-
Step 500
500
#679393
oklch(63.1% 0.048 196)
-
Step 600
600
#4E7D7D
oklch(55.6% 0.051 195.8)
-
Step 700
700
#3E6969
oklch(49% 0.048 195.7)
-
Step 800
800
#345656
oklch(42.7% 0.04 195.8)
-
Step 900
900 (this color)
#243D3D
oklch(34% 0.031 195.8)
-
Step 950
950
#1B2A29
oklch(27.1% 0.02 190.8)
#243D3D 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) | #3A3B3D | 0.032 |
| Deuteranopia (no green cones) | #35373D | 0.030 |
| Tritanopia (no blue cones) | #1A3F3D | 0.012 |
| Achromatopsia (no color) | #393939 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243D3D
#243D3D
oklch(34% 0.031 195.8)
- #473132
#473132
oklch(33.9% 0.032 15.9)
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 #243D3D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.032
- Midnight Green #073B4C ΔE 0.037
- Charcoal Grey #3C4142 ΔE 0.040
- Gunmetal #293241 ΔE 0.041
- Charcoal #264653 ΔE 0.042
- Dark Teal #014D4E ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.055
Use #243D3D 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.