#343B59
Closest named color: Dark Grey Blue (#29465B). oklch(36% 0.053 273.4), rgb(52, 59, 89).
Aa
White text reads best on this color (10.96:1).
About this color
#343B59 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.053 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.036 away. White text reads best on it, at 10.96:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.91:1 |
| White text | 10.96:1 |
Values
| HEX | #343B59 |
| RGB | rgb(52, 59, 89) |
| HSL | hsl(229, 26%, 28%) |
| OKLCH | oklch(36% 0.053 273.4) |
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 #343B59 | 10.96:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #343B59 | 1.91:1 | Fails | Lc 8.6 | Not readable |
| #343B59 text on white | 10.96:1 | AAA | Lc 95.3 | Preferred for body text |
| #343B59 text on black | 1.91:1 | Fails | Lc -7.3 | 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
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D4D8E8
oklch(88.4% 0.022 274.7)
-
Step 300
300
#B8BFDB
oklch(80.8% 0.04 274.4)
-
Step 400
400
#939EC9
oklch(70.6% 0.064 273.5)
-
Step 500
500
#7986BB
oklch(63% 0.081 273.3)
-
Step 600
600
#636FA7
oklch(55.6% 0.088 274)
-
Step 700
700
#525D8F
oklch(49.1% 0.081 273.6)
-
Step 800
800
#434C74
oklch(42.7% 0.068 273.5)
-
Step 900
900 (this color)
#343B59
oklch(36% 0.053 273.4)
-
Step 950
950
#212537
oklch(26.9% 0.034 274.3)
#343B59 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) | #313E5A | 0.010 |
| Deuteranopia (no green cones) | #2E3B58 | 0.009 |
| Tritanopia (no blue cones) | #294146 | 0.047 |
| Achromatopsia (no color) | #3C3C3C | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343B59
#343B59
oklch(36% 0.053 273.4)
- #463C1A
#463C1A
oklch(35.8% 0.052 93.2)
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 #343B59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.036
- Dark Blue Grey #1F3B4D ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.039
- Charcoal #264653 ΔE 0.043
- Onyx #343A40 ΔE 0.044
- Gunmetal #293241 ΔE 0.051
- Charcoal Grey #3C4142 ΔE 0.051
- Midnight Green #073B4C ΔE 0.055
Use #343B59 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.