#343E63
Closest named color: Dark Grey Blue (#29465B). oklch(37.3% 0.065 271.5), rgb(52, 62, 99).
Aa
White text reads best on this color (10.42:1).
About this color
#343E63 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.065 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.034 away. White text reads best on it, at 10.42:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.01:1 |
| White text | 10.42:1 |
Values
| HEX | #343E63 |
| RGB | rgb(52, 62, 99) |
| HSL | hsl(227, 31%, 30%) |
| OKLCH | oklch(37.3% 0.065 271.5) |
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 #343E63 | 10.42:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #343E63 | 2.01:1 | Fails | Lc 9.8 | Not readable |
| #343E63 text on white | 10.42:1 | AAA | Lc 94.1 | Preferred for body text |
| #343E63 text on black | 2.01:1 | Fails | Lc -8.4 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9EC
oklch(88.6% 0.027 269.6)
-
Step 300
300
#B5BFE1
oklch(80.8% 0.049 272.4)
-
Step 400
400
#8F9ED2
oklch(70.7% 0.078 271.8)
-
Step 500
500
#7486C6
oklch(63.2% 0.099 271.4)
-
Step 600
600
#5D6EB3
oklch(55.6% 0.109 272)
-
Step 700
700
#4C5C9A
oklch(49.1% 0.101 271.3)
-
Step 800
800
#3F4B7D
oklch(42.7% 0.084 272.2)
-
Step 900
900 (this color)
#343E63
oklch(37.3% 0.065 271.5)
-
Step 950
950
#1F253B
oklch(27% 0.042 271.7)
#343E63 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) | #314265 | 0.012 |
| Deuteranopia (no green cones) | #2C3E62 | 0.011 |
| Tritanopia (no blue cones) | #23464C | 0.058 |
| Achromatopsia (no color) | #404040 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343E63
#343E63
oklch(37.3% 0.065 271.5)
- #4D3F11
#4D3F11
oklch(37.3% 0.065 91.7)
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 #343E63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.034
- Charcoal #264653 ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.050
- Twilight Blue #0A437A ΔE 0.052
- Marine Blue #01386A ΔE 0.056
- Onyx #343A40 ΔE 0.060
- Charcoal Grey #3C4142 ΔE 0.062
Use #343E63 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.