#243C3A
Closest named color: Onyx (#343A40). oklch(33.6% 0.03 189.2), rgb(36, 60, 58).
Aa
White text reads best on this color (11.78:1).
About this color
#243C3A is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.030 and its hue 189°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.028 away. White text reads best on it, at 11.78:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.78:1 |
| White text | 11.78:1 |
Values
| HEX | #243C3A |
| RGB | rgb(36, 60, 58) |
| HSL | hsl(175, 25%, 19%) |
| OKLCH | oklch(33.6% 0.03 189.2) |
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 #243C3A | 11.78:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #243C3A | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #243C3A text on white | 11.78:1 | AAA | Lc 97.0 | Preferred for body text |
| #243C3A text on black | 1.78:1 | 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
#D0DCDB
oklch(88.5% 0.013 190.9)
-
Step 300
300
#B1C6C3
oklch(81% 0.023 186.4)
-
Step 400
400
#88A8A5
oklch(70.7% 0.035 189.4)
-
Step 500
500
#69938F
oklch(63.1% 0.046 188.7)
-
Step 600
600
#507D79
oklch(55.6% 0.05 188.7)
-
Step 700
700
#406966
oklch(49% 0.046 189.8)
-
Step 800
800
#355653
oklch(42.7% 0.039 188.5)
-
Step 900
900 (this color)
#243C3A
oklch(33.6% 0.03 189.2)
-
Step 950
950
#1C2A28
oklch(27.2% 0.019 185.2)
#243C3A 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) | #393A3A | 0.031 |
| Deuteranopia (no green cones) | #35363A | 0.031 |
| Tritanopia (no blue cones) | #1B3D3B | 0.010 |
| Achromatopsia (no color) | #383838 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243C3A
#243C3A
oklch(33.6% 0.03 189.2)
- #453033
#453033
oklch(33.5% 0.031 9.4)
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 #243C3A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.035
- Midnight Green #073B4C ΔE 0.039
- Gunmetal #293241 ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.043
- Charcoal #264653 ΔE 0.048
- Pakistan Green #283618 ΔE 0.052
- Dark Teal #014D4E ΔE 0.057
Use #243C3A 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.