#343D63
Closest named color: Dark Grey Blue (#29465B). oklch(37% 0.067 272.7), rgb(52, 61, 99).
Aa
White text reads best on this color (10.53:1).
About this color
#343D63 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.067 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.037 away. White text reads best on it, at 10.53:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.99:1 |
| White text | 10.53:1 |
Values
| HEX | #343D63 |
| RGB | rgb(52, 61, 99) |
| HSL | hsl(229, 31%, 30%) |
| OKLCH | oklch(37% 0.067 272.7) |
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 #343D63 | 10.53:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #343D63 | 1.99:1 | Fails | Lc 9.5 | Not readable |
| #343D63 text on white | 10.53:1 | AAA | Lc 94.4 | Preferred for body text |
| #343D63 text on black | 1.99:1 | Fails | Lc -8.2 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F4
oklch(93.5% 0.015 273.8)
-
Step 200
200
#D3D8EC
oklch(88.4% 0.028 274.6)
-
Step 300
300
#B5BFE2
oklch(80.8% 0.051 272.7)
-
Step 400
400
#909ED3
oklch(70.8% 0.079 272.8)
-
Step 500
500
#7585C7
oklch(63.1% 0.101 272.8)
-
Step 600
600
#5E6EB4
oklch(55.7% 0.11 272.6)
-
Step 700
700
#4D5B9B
oklch(49% 0.104 272.7)
-
Step 800
800
#3F4B7E
oklch(42.7% 0.086 272.3)
-
Step 900
900 (this color)
#343D63
oklch(37% 0.067 272.7)
-
Step 950
950
#1F253B
oklch(27% 0.042 271.7)
#343D63 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) | #2F4165 | 0.013 |
| Deuteranopia (no green cones) | #2B3D62 | 0.013 |
| Tritanopia (no blue cones) | #24454B | 0.060 |
| Achromatopsia (no color) | #3F3F3F | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343D63
#343D63
oklch(37% 0.067 272.7)
- #4C3F0F
#4C3F0F
oklch(37.1% 0.067 93.4)
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 #343D63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.046
- Charcoal #264653 ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.050
- Twilight Blue #0A437A ΔE 0.052
- Marine Blue #01386A ΔE 0.055
- Onyx #343A40 ΔE 0.060
- Charcoal Grey #3C4142 ΔE 0.064
Use #343D63 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.