#243F4A
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.1% 0.038 226), rgb(36, 63, 74).
Aa
White text reads best on this color (11.14:1).
About this color
#243F4A is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.038 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.017 away. White text reads best on it, at 11.14:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.88:1 |
| White text | 11.14:1 |
Values
| HEX | #243F4A |
| RGB | rgb(36, 63, 74) |
| HSL | hsl(197, 35%, 22%) |
| OKLCH | oklch(35.1% 0.038 226) |
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 #243F4A | 11.14:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #243F4A | 1.88:1 | Fails | Lc 8.2 | Not readable |
| #243F4A text on white | 11.14:1 | AAA | Lc 95.7 | Preferred for body text |
| #243F4A text on black | 1.88:1 | 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
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CFDCE1
oklch(88.6% 0.016 222.7)
-
Step 300
300
#AEC5CF
oklch(80.9% 0.029 225.8)
-
Step 400
400
#83A7B7
oklch(70.7% 0.046 226.9)
-
Step 500
500
#6291A5
oklch(63% 0.059 226.5)
-
Step 600
600
#487B90
oklch(55.5% 0.064 226.4)
-
Step 700
700
#39687A
oklch(49.1% 0.059 224.9)
-
Step 800
800
#305564
oklch(42.8% 0.049 226.1)
-
Step 900
900 (this color)
#243F4A
oklch(35.1% 0.038 226)
-
Step 950
950
#19292F
oklch(26.9% 0.024 223.4)
#243F4A 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) | #393E4B | 0.029 |
| Deuteranopia (no green cones) | #333A4A | 0.025 |
| Tritanopia (no blue cones) | #124242 | 0.027 |
| Achromatopsia (no color) | #3B3B3B | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243F4A
#243F4A
oklch(35.1% 0.038 226)
- #4C352A
#4C352A
oklch(35.2% 0.038 46.6)
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 #243F4A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.017
- Charcoal #264653 ΔE 0.025
- Onyx #343A40 ΔE 0.027
- Midnight Green #073B4C ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.034
- Charcoal Grey #3C4142 ΔE 0.037
- Gunmetal #293241 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.047
Use #243F4A 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.