#343F58
Closest named color: Dark Grey Blue (#29465B). oklch(36.9% 0.046 265.9), rgb(52, 63, 88).
Aa
White text reads best on this color (10.51:1).
About this color
#343F58 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.046 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.024 away. White text reads best on it, at 10.51:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #343F58 |
| RGB | rgb(52, 63, 88) |
| HSL | hsl(222, 26%, 27%) |
| OKLCH | oklch(36.9% 0.046 265.9) |
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 #343F58 | 10.51:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #343F58 | 1.99:1 | Fails | Lc 9.6 | Not readable |
| #343F58 text on white | 10.51:1 | AAA | Lc 94.4 | Preferred for body text |
| #343F58 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7EAF1
oklch(93.7% 0.01 267.4)
-
Step 200
200
#D3D9E6
oklch(88.5% 0.019 266)
-
Step 300
300
#B6C1D8
oklch(81% 0.035 265.2)
-
Step 400
400
#90A0C4
oklch(70.6% 0.056 266.2)
-
Step 500
500
#7589B5
oklch(63.1% 0.071 265.5)
-
Step 600
600
#5E72A0
oklch(55.5% 0.076 265.9)
-
Step 700
700
#4E6089
oklch(49.2% 0.07 265.7)
-
Step 800
800
#404E70
oklch(42.7% 0.06 266.7)
-
Step 900
900 (this color)
#343F58
oklch(36.9% 0.046 265.9)
-
Step 950
950
#202635
oklch(27% 0.029 267.5)
#343F58 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) | #374159 | 0.008 |
| Deuteranopia (no green cones) | #333E57 | 0.004 |
| Tritanopia (no blue cones) | #294448 | 0.040 |
| Achromatopsia (no color) | #3F3F3F | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343F58
#343F58
oklch(36.9% 0.046 265.9)
- #4A3E22
#4A3E22
oklch(36.9% 0.046 87)
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 #343F58, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.024
- Charcoal #264653 ΔE 0.031
- Dark Blue Grey #1F3B4D ΔE 0.037
- Onyx #343A40 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.048
- Midnight Green #073B4C ΔE 0.055
- Gunmetal #293241 ΔE 0.056
Use #343F58 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.