#243D4F
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.8% 0.044 241), rgb(36, 61, 79).
Aa
White text reads best on this color (11.31:1).
About this color
#243D4F is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.044 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.010 away. White text reads best on it, at 11.31:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.85:1 |
| White text | 11.31:1 |
Values
| HEX | #243D4F |
| RGB | rgb(36, 61, 79) |
| HSL | hsl(205, 37%, 23%) |
| OKLCH | oklch(34.8% 0.044 241) |
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 #243D4F | 11.31:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #243D4F | 1.85:1 | Fails | Lc 7.8 | Not readable |
| #243D4F text on white | 11.31:1 | AAA | Lc 96.0 | Preferred for body text |
| #243D4F 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CFDBE4
oklch(88.5% 0.018 240)
-
Step 300
300
#AEC4D4
oklch(80.9% 0.033 239.5)
-
Step 400
400
#83A5BF
oklch(70.6% 0.053 241.4)
-
Step 500
500
#648FAF
oklch(63.1% 0.068 241.3)
-
Step 600
600
#4A799B
oklch(55.7% 0.074 241.3)
-
Step 700
700
#3B6684
oklch(49.2% 0.068 240.5)
-
Step 800
800
#31536B
oklch(42.7% 0.056 240.6)
-
Step 900
900 (this color)
#243D4F
oklch(34.8% 0.044 241)
-
Step 950
950
#1A2833
oklch(26.9% 0.028 242.7)
#243D4F 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) | #353D50 | 0.024 |
| Deuteranopia (no green cones) | #2F384F | 0.021 |
| Tritanopia (no blue cones) | #0F4143 | 0.035 |
| Achromatopsia (no color) | #3A3A3A | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243D4F
#243D4F
oklch(34.8% 0.044 241)
- #4B3522
#4B3522
oklch(34.9% 0.044 61.4)
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 #243D4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.010
- Midnight Green #073B4C ΔE 0.027
- Charcoal #264653 ΔE 0.030
- Onyx #343A40 ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.035
- Gunmetal #293241 ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.045
Use #243D4F 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.