#343C49
Closest named color: Onyx (#343A40). oklch(35.4% 0.025 260.1), rgb(52, 60, 73).
Aa
White text reads best on this color (11.11:1).
About this color
#343C49 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.015 away. White text reads best on it, at 11.11:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.88:1 |
| White text | 11.11:1 |
Values
| HEX | #343C49 |
| RGB | rgb(52, 60, 73) |
| HSL | hsl(217, 17%, 25%) |
| OKLCH | oklch(35.4% 0.025 260.1) |
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 #343C49 | 11.11:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #343C49 | 1.88:1 | Fails | Lc 8.2 | Not readable |
| #343C49 text on white | 11.11:1 | AAA | Lc 95.7 | Preferred for body text |
| #343C49 text on black | 1.88:1 | 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
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5D9E0
oklch(88.4% 0.011 261.8)
-
Step 300
300
#BAC1CD
oklch(80.9% 0.019 261.3)
-
Step 400
400
#96A1B4
oklch(70.6% 0.03 261.4)
-
Step 500
500
#7C8AA1
oklch(63% 0.038 260.3)
-
Step 600
600
#65748C
oklch(55.6% 0.042 259.8)
-
Step 700
700
#546177
oklch(49% 0.039 260.9)
-
Step 800
800
#455061
oklch(42.8% 0.032 259)
-
Step 900
900 (this color)
#343C49
oklch(35.4% 0.025 260.1)
-
Step 950
950
#22272E
oklch(27.1% 0.015 256.8)
#343C49 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) | #383D4A | 0.008 |
| Deuteranopia (no green cones) | #363B49 | 0.004 |
| Tritanopia (no blue cones) | #2E3F40 | 0.023 |
| Achromatopsia (no color) | #3B3B3B | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343C49
#343C49
oklch(35.4% 0.025 260.1)
- #433A2D
#433A2D
oklch(35.4% 0.025 76.9)
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 #343C49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.015
- Charcoal Grey #3C4142 ΔE 0.027
- Dark Blue Grey #1F3B4D ΔE 0.029
- Charcoal #264653 ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.038
- Gunmetal #293241 ΔE 0.039
- Midnight Green #073B4C ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.050
Use #343C49 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.