#243F37
Closest named color: Onyx (#343A40). oklch(34.3% 0.036 173.3), rgb(36, 63, 55).
Aa
White text reads best on this color (11.40:1).
About this color
#243F37 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.036 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.035 away. White text reads best on it, at 11.40:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.84:1 |
| White text | 11.40:1 |
Values
| HEX | #243F37 |
| RGB | rgb(36, 63, 55) |
| HSL | hsl(162, 27%, 19%) |
| OKLCH | oklch(34.3% 0.036 173.3) |
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 #243F37 | 11.40:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #243F37 | 1.84:1 | Fails | Lc 7.6 | Not readable |
| #243F37 text on white | 11.40:1 | AAA | Lc 96.2 | Preferred for body text |
| #243F37 text on black | 1.84:1 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E5ECE9
oklch(93.7% 0.008 168.7)
-
Step 200
200
#D0DCD8
oklch(88.4% 0.014 174.1)
-
Step 300
300
#B0C7BF
oklch(81% 0.027 172.7)
-
Step 400
400
#85AA9E
oklch(70.7% 0.044 173.2)
-
Step 500
500
#669586
oklch(63.2% 0.056 172.5)
-
Step 600
600
#4C7F70
oklch(55.6% 0.06 173.3)
-
Step 700
700
#3D6B5E
oklch(49.1% 0.055 173.8)
-
Step 800
800
#33574D
oklch(42.6% 0.045 174.4)
-
Step 900
900 (this color)
#243F37
oklch(34.3% 0.036 173.3)
-
Step 950
950
#1B2A25
oklch(27% 0.022 171.9)
#243F37 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) | #3D3C37 | 0.037 |
| Deuteranopia (no green cones) | #393838 | 0.037 |
| Tritanopia (no blue cones) | #1C403D | 0.012 |
| Achromatopsia (no color) | #3A3A3A | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243F37
#243F37
oklch(34.3% 0.036 173.3)
- #48313A
#48313A
oklch(34.3% 0.036 354)
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 #243F37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.035
- Charcoal Grey #3C4142 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.046
- Evergreen #05472A ΔE 0.047
- Pakistan Green #283618 ΔE 0.048
- Charcoal #264653 ΔE 0.048
- Midnight Green #073B4C ΔE 0.049
- Dark Teal #014D4E ΔE 0.051
Use #243F37 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.