#343F72
Closest named color: Twilight Blue (#0A437A). oklch(38.5% 0.088 272.5), rgb(52, 63, 114).
Aa
White text reads best on this color (10.00:1).
About this color
#343F72 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.088 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.039 away. White text reads best on it, at 10.00:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.09:1 |
| White text | 10.00:1 |
Values
| HEX | #343F72 |
| RGB | rgb(52, 63, 114) |
| HSL | hsl(229, 37%, 33%) |
| OKLCH | oklch(38.5% 0.088 272.5) |
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 #343F72 | 10.00:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #343F72 | 2.09:1 | Fails | Lc 10.9 | Not readable |
| #343F72 text on white | 10.00:1 | AAA | Lc 93.1 | Preferred for body text |
| #343F72 text on black | 2.09:1 | Fails | Lc -9.4 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
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
#B2BFEC
oklch(81% 0.065 272.3)
-
Step 400
400
#8A9CE3
oklch(70.7% 0.106 272.6)
-
Step 500
500
#6E82DA
oklch(63.1% 0.134 272.4)
-
Step 600
600
#576AC8
oklch(55.6% 0.146 272.2)
-
Step 700
700
#4858AD
oklch(49.2% 0.136 272.5)
-
Step 800
800
#3B488C
oklch(42.7% 0.113 272.6)
-
Step 900
900 (this color)
#343F72
oklch(38.5% 0.088 272.5)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#343F72 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) | #2A4574 | 0.020 |
| Deuteranopia (no green cones) | #234071 | 0.021 |
| Tritanopia (no blue cones) | #184A53 | 0.078 |
| Achromatopsia (no color) | #424242 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343F72
#343F72
oklch(38.5% 0.088 272.5)
- #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 #343F72, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.054
- Cobalt #1E488F ΔE 0.054
- Light Navy #155084 ΔE 0.056
- Marine Blue #01386A ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.064
- Charcoal #264653 ΔE 0.066
Use #343F72 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.