#343C63
Closest named color: Dark Grey Blue (#29465B). oklch(36.8% 0.068 273.8), rgb(52, 60, 99).
Aa
White text reads best on this color (10.64:1).
About this color
#343C63 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.068 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.039 away. White text reads best on it, at 10.64:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.64:1 |
Values
| HEX | #343C63 |
| RGB | rgb(52, 60, 99) |
| HSL | hsl(230, 31%, 30%) |
| OKLCH | oklch(36.8% 0.068 273.8) |
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 #343C63 | 10.64:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #343C63 | 1.97:1 | Fails | Lc 9.3 | Not readable |
| #343C63 text on white | 10.64:1 | AAA | Lc 94.6 | Preferred for body text |
| #343C63 text on black | 1.97:1 | Fails | Lc -8.0 | 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
#B6BFE2
oklch(80.9% 0.05 273.9)
-
Step 400
400
#909DD4
oklch(70.6% 0.082 273.9)
-
Step 500
500
#7684C9
oklch(63.1% 0.105 274.3)
-
Step 600
600
#5F6DB5
oklch(55.6% 0.113 273.9)
-
Step 700
700
#4E5B9C
oklch(49.1% 0.105 273.4)
-
Step 800
800
#404A7E
oklch(42.6% 0.087 273.9)
-
Step 900
900 (this color)
#343C63
oklch(36.8% 0.068 273.8)
-
Step 950
950
#20253B
oklch(27.1% 0.042 273.5)
#343C63 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) | #2E4065 | 0.014 |
| Deuteranopia (no green cones) | #2A3C62 | 0.014 |
| Tritanopia (no blue cones) | #24444A | 0.061 |
| Achromatopsia (no color) | #3E3E3E | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343C63
#343C63
oklch(36.8% 0.068 273.8)
- #4B3E0C
#4B3E0C
oklch(36.8% 0.068 93.7)
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 #343C63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.050
- Charcoal #264653 ΔE 0.051
- Twilight Blue #0A437A ΔE 0.053
- Marine Blue #01386A ΔE 0.054
- Onyx #343A40 ΔE 0.061
- Midnight Green #073B4C ΔE 0.065
Use #343C63 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.