#343F71
Closest named color: Twilight Blue (#0A437A). oklch(38.4% 0.086 272.4), rgb(52, 63, 113).
Aa
White text reads best on this color (10.02:1).
About this color
#343F71 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.086 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.040 away. White text reads best on it, at 10.02:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.09:1 |
| White text | 10.02:1 |
Values
| HEX | #343F71 |
| RGB | rgb(52, 63, 113) |
| HSL | hsl(229, 37%, 32%) |
| OKLCH | oklch(38.4% 0.086 272.4) |
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 #343F71 | 10.02:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #343F71 | 2.09:1 | Fails | Lc 10.8 | Not readable |
| #343F71 text on white | 10.02:1 | AAA | Lc 93.1 | Preferred for body text |
| #343F71 text on black | 2.09:1 | Fails | Lc -9.3 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B2BFEB
oklch(81% 0.064 272)
-
Step 400
400
#8A9CE1
oklch(70.6% 0.103 272.3)
-
Step 500
500
#6F82D9
oklch(63.1% 0.133 272.8)
-
Step 600
600
#586AC6
oklch(55.6% 0.143 272.6)
-
Step 700
700
#4858AB
oklch(49.1% 0.133 272.4)
-
Step 800
800
#3B488B
oklch(42.6% 0.111 272.6)
-
Step 900
900 (this color)
#343F71
oklch(38.4% 0.086 272.4)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#343F71 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) | #2B4573 | 0.019 |
| Deuteranopia (no green cones) | #244070 | 0.020 |
| Tritanopia (no blue cones) | #194A52 | 0.078 |
| Achromatopsia (no color) | #424242 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343F71
#343F71
oklch(38.4% 0.086 272.4)
- #524200
#524200
oklch(38.5% 0.079 93.2)
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 #343F71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.055
- Cobalt #1E488F ΔE 0.055
- Light Navy #155084 ΔE 0.057
- Marine Blue #01386A ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.062
- Charcoal #264653 ΔE 0.065
Use #343F71 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.