#243870
Closest named color: Marine Blue (#01386A). oklch(35.7% 0.1 266.6), rgb(36, 56, 112).
Aa
White text reads best on this color (11.20:1).
About this color
#243870 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.100 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.030 away. White text reads best on it, at 11.20:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.87:1 |
| White text | 11.20:1 |
Values
| HEX | #243870 |
| RGB | rgb(36, 56, 112) |
| HSL | hsl(224, 51%, 29%) |
| OKLCH | oklch(35.7% 0.1 266.6) |
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 #243870 | 11.20:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #243870 | 1.87:1 | Fails | Lc 8.3 | Not readable |
| #243870 text on white | 11.20:1 | AAA | Lc 95.6 | Preferred for body text |
| #243870 text on black | 1.87:1 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#AAC0F2
oklch(80.9% 0.075 266.2)
-
Step 400
400
#7E9EEC
oklch(70.8% 0.12 266.4)
-
Step 500
500
#5F83E6
oklch(63.1% 0.154 266.9)
-
Step 600
600
#466BD4
oklch(55.7% 0.167 266.4)
-
Step 700
700
#3858B7
oklch(49% 0.155 266.6)
-
Step 800
800
#2E4994
oklch(42.7% 0.128 266.2)
-
Step 900
900 (this color)
#243870
oklch(35.7% 0.1 266.6)
-
Step 950
950
#182445
oklch(26.9% 0.064 267)
#243870 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) | #1B3F72 | 0.021 |
| Deuteranopia (no green cones) | #0C386F | 0.022 |
| Tritanopia (no blue cones) | #00454E | 0.084 |
| Achromatopsia (no color) | #3B3B3B | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243870
#243870
oklch(35.7% 0.1 266.6)
- #4D3900
#4D3900
oklch(35.7% 0.073 86.5)
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 #243870, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.030
- Twilight Blue #0A437A ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.045
- Marine #042E60 ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.064
- Cobalt #1E488F ΔE 0.065
- Dark Blue Grey #1F3B4D ΔE 0.065
- Light Navy #155084 ΔE 0.073
Use #243870 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.