#343F49
Closest named color: Onyx (#343A40). oklch(36.2% 0.023 245.9), rgb(52, 63, 73).
Aa
White text reads best on this color (10.75:1).
About this color
#343F49 is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.023. 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 10.75:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.95:1 |
| White text | 10.75:1 |
Values
| HEX | #343F49 |
| RGB | rgb(52, 63, 73) |
| HSL | hsl(209, 17%, 25%) |
| OKLCH | oklch(36.2% 0.023 245.9) |
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 #343F49 | 10.75:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #343F49 | 1.95:1 | Fails | Lc 9.0 | Not readable |
| #343F49 text on white | 10.75:1 | AAA | Lc 94.9 | Preferred for body text |
| #343F49 text on black | 1.95:1 | Fails | Lc -7.7 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DADF
oklch(88.5% 0.009 242.9)
-
Step 300
300
#B8C2CB
oklch(80.9% 0.017 245.1)
-
Step 400
400
#93A3B1
oklch(70.7% 0.027 244.6)
-
Step 500
500
#798C9E
oklch(63.1% 0.035 246.9)
-
Step 600
600
#617689
oklch(55.6% 0.039 245.9)
-
Step 700
700
#516374
oklch(49.1% 0.035 247)
-
Step 800
800
#42515E
oklch(42.7% 0.029 244.7)
-
Step 900
900 (this color)
#343F49
oklch(36.2% 0.023 245.9)
-
Step 950
950
#21272D
oklch(26.9% 0.014 248.4)
#343F49 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) | #3B3F4A | 0.011 |
| Deuteranopia (no green cones) | #383D49 | 0.008 |
| Tritanopia (no blue cones) | #2E4142 | 0.018 |
| Achromatopsia (no color) | #3E3E3E | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343F49
#343F49
oklch(36.2% 0.023 245.9)
- #463B31
#463B31
oklch(36.1% 0.023 64.3)
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 #343F49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.019
- Charcoal Grey #3C4142 ΔE 0.020
- Charcoal #264653 ΔE 0.027
- Dark Blue Grey #1F3B4D ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.034
- Gunmetal #293241 ΔE 0.047
- Midnight Green #073B4C ΔE 0.050
- Dark Slate Gray #2F4F4F ΔE 0.050
Use #343F49 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.