#243C45
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34% 0.034 223.7), rgb(36, 60, 69).
Aa
White text reads best on this color (11.61:1).
About this color
#243C45 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.034 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.016 away. White text reads best on it, at 11.61:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.80:1 |
| White text | 11.61:1 |
Values
| HEX | #243C45 |
| RGB | rgb(36, 60, 69) |
| HSL | hsl(196, 31%, 21%) |
| OKLCH | oklch(34% 0.034 223.7) |
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 #243C45 | 11.61:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #243C45 | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #243C45 text on white | 11.61:1 | AAA | Lc 96.7 | Preferred for body text |
| #243C45 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
#D0DBE0
oklch(88.5% 0.014 226.6)
-
Step 300
300
#B0C5CD
oklch(81% 0.026 222.7)
-
Step 400
400
#86A7B3
oklch(70.8% 0.04 222)
-
Step 500
500
#6791A1
oklch(63.2% 0.052 223.6)
-
Step 600
600
#4D7B8C
oklch(55.6% 0.057 223.5)
-
Step 700
700
#3E6777
oklch(49% 0.053 224.9)
-
Step 800
800
#345461
oklch(42.7% 0.043 225.7)
-
Step 900
900 (this color)
#243C45
oklch(34% 0.034 223.7)
-
Step 950
950
#1B292E
oklch(27% 0.021 222)
#243C45 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) | #373B45 | 0.027 |
| Deuteranopia (no green cones) | #323745 | 0.024 |
| Tritanopia (no blue cones) | #163F3F | 0.022 |
| Achromatopsia (no color) | #393939 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243C45
#243C45
oklch(34% 0.034 223.7)
- #47332A
#47332A
oklch(34.1% 0.033 45.3)
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 #243C45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.016
- Onyx #343A40 ΔE 0.023
- Midnight Green #073B4C ΔE 0.027
- Gunmetal #293241 ΔE 0.032
- Charcoal #264653 ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.046
Use #243C45 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.