#343A4B
Closest named color: Onyx (#343A40). oklch(35% 0.031 269.6), rgb(52, 58, 75).
Aa
White text reads best on this color (11.33:1).
About this color
#343A4B is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.031 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.020 away. White text reads best on it, at 11.33:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.85:1 |
| White text | 11.33:1 |
Values
| HEX | #343A4B |
| RGB | rgb(52, 58, 75) |
| HSL | hsl(224, 18%, 25%) |
| OKLCH | oklch(35% 0.031 269.6) |
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 #343A4B | 11.33:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #343A4B | 1.85:1 | Fails | Lc 7.7 | Not readable |
| #343A4B text on white | 11.33:1 | AAA | Lc 96.2 | Preferred for body text |
| #343A4B text on black | 1.85:1 | Fails | Lc 0.0 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D6D9E2
oklch(88.6% 0.013 271.3)
-
Step 300
300
#BAC0D0
oklch(80.8% 0.023 269.4)
-
Step 400
400
#97A0B8
oklch(70.7% 0.037 269.2)
-
Step 500
500
#7E89A7
oklch(63.2% 0.047 269.2)
-
Step 600
600
#677292
oklch(55.5% 0.052 269.9)
-
Step 700
700
#56607C
oklch(49.2% 0.047 269.4)
-
Step 800
800
#464E65
oklch(42.6% 0.04 269.7)
-
Step 900
900 (this color)
#343A4B
oklch(35% 0.031 269.6)
-
Step 950
950
#232630
oklch(27% 0.019 272)
#343A4B 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) | #353B4C | 0.004 |
| Deuteranopia (no green cones) | #33394B | 0.004 |
| Tritanopia (no blue cones) | #2E3D40 | 0.027 |
| Achromatopsia (no color) | #3A3A3A | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343A4B
#343A4B
oklch(35% 0.031 269.6)
- #413A28
#413A28
oklch(35% 0.031 89.2)
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 #343A4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.020
- Dark Blue Grey #1F3B4D ΔE 0.028
- Charcoal Grey #3C4142 ΔE 0.035
- Gunmetal #293241 ΔE 0.035
- Charcoal #264653 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.046
Use #343A4B 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.