#343771
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.098 278.2), rgb(52, 55, 113).
Aa
White text reads best on this color (10.87:1).
About this color
#343771 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.098 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.049 away. White text reads best on it, at 10.87:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.93:1 |
| White text | 10.87:1 |
Values
| HEX | #343771 |
| RGB | rgb(52, 55, 113) |
| HSL | hsl(237, 37%, 32%) |
| OKLCH | oklch(36.6% 0.098 278.2) |
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 #343771 | 10.87:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #343771 | 1.93:1 | Fails | Lc 8.9 | Not readable |
| #343771 text on white | 10.87:1 | AAA | Lc 95.0 | Preferred for body text |
| #343771 text on black | 1.93:1 | Fails | Lc -7.6 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D2D7F5
oklch(88.5% 0.042 278)
-
Step 300
300
#B5BDF0
oklch(81% 0.073 277.7)
-
Step 400
400
#9099E9
oklch(70.8% 0.117 278.1)
-
Step 500
500
#767DE2
oklch(63.1% 0.15 278.2)
-
Step 600
600
#6064D0
oklch(55.6% 0.163 278.1)
-
Step 700
700
#5052B4
oklch(49.1% 0.152 278.3)
-
Step 800
800
#414492
oklch(42.7% 0.126 278)
-
Step 900
900 (this color)
#343771
oklch(36.6% 0.098 278.2)
-
Step 950
950
#202244
oklch(26.9% 0.063 278.8)
#343771 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) | #1C3F73 | 0.034 |
| Deuteranopia (no green cones) | #163B70 | 0.036 |
| Tritanopia (no blue cones) | #1B444E | 0.087 |
| Achromatopsia (no color) | #3D3D3D | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343771
#343771
oklch(36.6% 0.098 278.2)
- #493F00
#493F00
oklch(36.7% 0.076 99.1)
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 #343771, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.049
- Marine Blue #01386A ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.057
- Cobalt #1E488F ΔE 0.066
- Dark Grey Blue #29465B ΔE 0.067
- Marine #042E60 ΔE 0.070
- Blueberry #464196 ΔE 0.073
Use #343771 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.