#343B63
Closest named color: Dark Grey Blue (#29465B). oklch(36.6% 0.07 274.9), rgb(52, 59, 99).
Aa
White text reads best on this color (10.75:1).
About this color
#343B63 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.070 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.042 away. White text reads best on it, at 10.75:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.95:1 |
| White text | 10.75:1 |
Values
| HEX | #343B63 |
| RGB | rgb(52, 59, 99) |
| HSL | hsl(231, 31%, 30%) |
| OKLCH | oklch(36.6% 0.07 274.9) |
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 #343B63 | 10.75:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #343B63 | 1.95:1 | Fails | Lc 9.0 | Not readable |
| #343B63 text on white | 10.75:1 | AAA | Lc 94.9 | Preferred for body text |
| #343B63 text on black | 1.95:1 | Fails | Lc -7.8 | 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
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D3D8ED
oklch(88.5% 0.029 275.1)
-
Step 300
300
#B6BFE3
oklch(81% 0.052 274.2)
-
Step 400
400
#919DD5
oklch(70.7% 0.083 274.7)
-
Step 500
500
#7784CA
oklch(63.2% 0.106 274.9)
-
Step 600
600
#606CB6
oklch(55.5% 0.115 275)
-
Step 700
700
#4F5A9D
oklch(49.1% 0.108 274.7)
-
Step 800
800
#414A7F
oklch(42.7% 0.088 274.8)
-
Step 900
900 (this color)
#343B63
oklch(36.6% 0.07 274.9)
-
Step 950
950
#20253C
oklch(27.1% 0.043 273.8)
#343B63 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) | #2C4065 | 0.017 |
| Deuteranopia (no green cones) | #293C62 | 0.016 |
| Tritanopia (no blue cones) | #24434A | 0.061 |
| Achromatopsia (no color) | #3E3E3E | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343B63
#343B63
oklch(36.6% 0.07 274.9)
- #4A3E09
#4A3E09
oklch(36.6% 0.069 95.4)
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 #343B63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.050
- Marine Blue #01386A ΔE 0.053
- Charcoal #264653 ΔE 0.053
- Twilight Blue #0A437A ΔE 0.053
- Onyx #343A40 ΔE 0.061
- Gunmetal #293241 ΔE 0.065
Use #343B63 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.