#343F67
Closest named color: Dark Grey Blue (#29465B). oklch(37.8% 0.07 271.1), rgb(52, 63, 103).
Aa
White text reads best on this color (10.22:1).
About this color
#343F67 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.070 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.037 away. White text reads best on it, at 10.22:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.05:1 |
| White text | 10.22:1 |
Values
| HEX | #343F67 |
| RGB | rgb(52, 63, 103) |
| HSL | hsl(227, 33%, 30%) |
| OKLCH | oklch(37.8% 0.07 271.1) |
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 #343F67 | 10.22:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #343F67 | 2.05:1 | Fails | Lc 10.3 | Not readable |
| #343F67 text on white | 10.22:1 | AAA | Lc 93.7 | Preferred for body text |
| #343F67 text on black | 2.05:1 | Fails | Lc -8.9 | 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
#D2D9ED
oklch(88.6% 0.029 270.4)
-
Step 300
300
#B4BFE4
oklch(80.8% 0.054 272.1)
-
Step 400
400
#8D9ED6
oklch(70.7% 0.085 271.1)
-
Step 500
500
#7185CB
oklch(63.1% 0.108 270.9)
-
Step 600
600
#5A6EB8
oklch(55.7% 0.117 270.8)
-
Step 700
700
#4A5B9E
oklch(49% 0.109 271.2)
-
Step 800
800
#3D4B80
oklch(42.7% 0.09 271)
-
Step 900
900 (this color)
#343F67
oklch(37.8% 0.07 271.1)
-
Step 950
950
#1E253C
oklch(27% 0.044 270.3)
#343F67 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) | #304369 | 0.012 |
| Deuteranopia (no green cones) | #2B3F66 | 0.013 |
| Tritanopia (no blue cones) | #21474E | 0.062 |
| Achromatopsia (no color) | #414141 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343F67
#343F67
oklch(37.8% 0.07 271.1)
- #50400C
#50400C
oklch(37.8% 0.07 90.7)
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 #343F67, 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
- Twilight Blue #0A437A ΔE 0.047
- Charcoal #264653 ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.056
- Marine Blue #01386A ΔE 0.056
- Light Navy #155084 ΔE 0.065
- Onyx #343A40 ΔE 0.067
Use #343F67 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.