#343B4B
Closest named color: Onyx (#343A40). oklch(35.3% 0.03 266.4), rgb(52, 59, 75).
Aa
White text reads best on this color (11.21:1).
About this color
#343B4B is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.030. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.019 away. White text reads best on it, at 11.21:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.030) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.87:1 |
| White text | 11.21:1 |
Values
| HEX | #343B4B |
| RGB | rgb(52, 59, 75) |
| HSL | hsl(222, 18%, 25%) |
| OKLCH | oklch(35.3% 0.03 266.4) |
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 #343B4B | 11.21:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #343B4B | 1.87:1 | Fails | Lc 8.0 | Not readable |
| #343B4B text on white | 11.21:1 | AAA | Lc 95.9 | Preferred for body text |
| #343B4B text on black | 1.87:1 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D5D9E2
oklch(88.5% 0.013 266.7)
-
Step 300
300
#BAC1CF
oklch(81% 0.021 264.4)
-
Step 400
400
#96A1B7
oklch(70.8% 0.035 264.3)
-
Step 500
500
#7D89A6
oklch(63.1% 0.046 267.4)
-
Step 600
600
#667391
oklch(55.6% 0.049 266.5)
-
Step 700
700
#55607B
oklch(49% 0.046 267.4)
-
Step 800
800
#454F64
oklch(42.7% 0.037 264.9)
-
Step 900
900 (this color)
#343B4B
oklch(35.3% 0.03 266.4)
-
Step 950
950
#222630
oklch(26.9% 0.02 267.9)
#343B4B 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) | #363C4C | 0.005 |
| Deuteranopia (no green cones) | #343A4B | 0.003 |
| Tritanopia (no blue cones) | #2E3E40 | 0.027 |
| Achromatopsia (no color) | #3B3B3B | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343B4B
#343B4B
oklch(35.3% 0.03 266.4)
- #423A29
#423A29
oklch(35.2% 0.03 85.6)
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 #343B4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.019
- Dark Blue Grey #1F3B4D ΔE 0.028
- Charcoal Grey #3C4142 ΔE 0.032
- Charcoal #264653 ΔE 0.036
- Gunmetal #293241 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.046
- Midnight Green #073B4C ΔE 0.047
Use #343B4B 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.