#243C43
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34% 0.032 218.2), rgb(36, 60, 67).
Aa
White text reads best on this color (11.65:1).
About this color
#243C43 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.032 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.020 away. White text reads best on it, at 11.65:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.80:1 |
| White text | 11.65:1 |
Values
| HEX | #243C43 |
| RGB | rgb(36, 60, 67) |
| HSL | hsl(194, 30%, 20%) |
| OKLCH | oklch(34% 0.032 218.2) |
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 #243C43 | 11.65:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #243C43 | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #243C43 text on white | 11.65:1 | AAA | Lc 96.7 | Preferred for body text |
| #243C43 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D0DBDF
oklch(88.4% 0.013 221.4)
-
Step 300
300
#B0C5CB
oklch(80.9% 0.024 216.8)
-
Step 400
400
#86A7B1
oklch(70.7% 0.039 218.2)
-
Step 500
500
#67919E
oklch(63.1% 0.05 219)
-
Step 600
600
#4E7B88
oklch(55.5% 0.053 218)
-
Step 700
700
#3E6874
oklch(49.1% 0.051 218)
-
Step 800
800
#34555E
oklch(42.8% 0.041 216.9)
-
Step 900
900 (this color)
#243C43
oklch(34% 0.032 218.2)
-
Step 950
950
#1B292D
oklch(27% 0.02 217.4)
#243C43 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) | #373B43 | 0.027 |
| Deuteranopia (no green cones) | #333743 | 0.026 |
| Tritanopia (no blue cones) | #173F3E | 0.021 |
| Achromatopsia (no color) | #383838 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243C43
#243C43
oklch(34% 0.032 218.2)
- #47322C
#47322C
oklch(34% 0.033 36.6)
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 #243C43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.020
- Onyx #343A40 ΔE 0.022
- Midnight Green #073B4C ΔE 0.029
- Gunmetal #293241 ΔE 0.033
- Charcoal #264653 ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.049
Use #243C43 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.