#243971
Closest named color: Marine Blue (#01386A). oklch(36% 0.1 266.1), rgb(36, 57, 113).
Aa
White text reads best on this color (11.06:1).
About this color
#243971 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.100 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.031 away. White text reads best on it, at 11.06:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.89:1 |
| White text | 11.06:1 |
Values
| HEX | #243971 |
| RGB | rgb(36, 57, 113) |
| HSL | hsl(224, 52%, 29%) |
| OKLCH | oklch(36% 0.1 266.1) |
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 #243971 | 11.06:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #243971 | 1.89:1 | Fails | Lc 8.6 | Not readable |
| #243971 text on white | 11.06:1 | AAA | Lc 95.3 | Preferred for body text |
| #243971 text on black | 1.89:1 | Fails | Lc -7.3 | 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
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#AAC0F2
oklch(80.9% 0.075 266.2)
-
Step 400
400
#7D9EEC
oklch(70.7% 0.121 265.9)
-
Step 500
500
#5D84E6
oklch(63.2% 0.154 265.8)
-
Step 600
600
#456BD4
oklch(55.6% 0.167 266.1)
-
Step 700
700
#3759B7
oklch(49.2% 0.154 265.9)
-
Step 800
800
#2D4994
oklch(42.7% 0.128 265.8)
-
Step 900
900 (this color)
#243971
oklch(36% 0.1 266.1)
-
Step 950
950
#182545
oklch(27.1% 0.062 265.8)
#243971 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) | #1C4073 | 0.021 |
| Deuteranopia (no green cones) | #0D3970 | 0.021 |
| Tritanopia (no blue cones) | #00464F | 0.084 |
| Achromatopsia (no color) | #3C3C3C | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243971
#243971
oklch(36% 0.1 266.1)
- #4E3A00
#4E3A00
oklch(36.1% 0.074 86.8)
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 #243971, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.031
- Twilight Blue #0A437A ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.047
- Marine #042E60 ΔE 0.056
- Cobalt #1E488F ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.066
- Light Navy #155084 ΔE 0.069
Use #243971 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.