#243F3C
Closest named color: Onyx (#343A40). oklch(34.5% 0.033 186.8), rgb(36, 63, 60).
Aa
White text reads best on this color (11.34:1).
About this color
#243F3C is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.033 and its hue 187°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.030 away. White text reads best on it, at 11.34:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.85:1 |
| White text | 11.34:1 |
Values
| HEX | #243F3C |
| RGB | rgb(36, 63, 60) |
| HSL | hsl(173, 27%, 19%) |
| OKLCH | oklch(34.5% 0.033 186.8) |
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 #243F3C | 11.34:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #243F3C | 1.85:1 | Fails | Lc 7.8 | Not readable |
| #243F3C text on white | 11.34:1 | AAA | Lc 96.1 | Preferred for body text |
| #243F3C text on black | 1.85:1 | 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
#E5EBEA
oklch(93.5% 0.007 185.3)
-
Step 200
200
#CFDCDA
oklch(88.4% 0.014 185.9)
-
Step 300
300
#AFC6C3
oklch(80.8% 0.025 187.2)
-
Step 400
400
#85A9A5
oklch(70.7% 0.04 187.9)
-
Step 500
500
#65948E
oklch(63.1% 0.052 186)
-
Step 600
600
#4B7E79
oklch(55.6% 0.056 187.7)
-
Step 700
700
#3C6A65
oklch(49% 0.051 186.7)
-
Step 800
800
#325753
oklch(42.8% 0.043 186.9)
-
Step 900
900 (this color)
#243F3C
oklch(34.5% 0.033 186.8)
-
Step 950
950
#1A2A28
oklch(27% 0.022 186.2)
#243F3C 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) | #3C3C3C | 0.035 |
| Deuteranopia (no green cones) | #38393C | 0.033 |
| Tritanopia (no blue cones) | #1A403E | 0.010 |
| Achromatopsia (no color) | #3A3A3A | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243F3C
#243F3C
oklch(34.5% 0.033 186.8)
- #493236
#493236
oklch(34.5% 0.034 7.5)
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 #243F3C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.037
- Charcoal Grey #3C4142 ΔE 0.038
- Charcoal #264653 ΔE 0.041
- Midnight Green #073B4C ΔE 0.042
- Dark Teal #014D4E ΔE 0.048
- Gunmetal #293241 ΔE 0.048
- Evergreen #05472A ΔE 0.054
Use #243F3C 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.