#343E49
Closest named color: Onyx (#343A40). oklch(35.9% 0.023 250.9), rgb(52, 62, 73).
Aa
White text reads best on this color (10.87:1).
About this color
#343E49 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 0.017 away. White text reads best on it, at 10.87:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.93:1 |
| White text | 10.87:1 |
Values
| HEX | #343E49 |
| RGB | rgb(52, 62, 73) |
| HSL | hsl(211, 17%, 25%) |
| OKLCH | oklch(35.9% 0.023 250.9) |
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 #343E49 | 10.87:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #343E49 | 1.93:1 | Fails | Lc 8.7 | Not readable |
| #343E49 text on white | 10.87:1 | AAA | Lc 95.2 | Preferred for body text |
| #343E49 text on black | 1.93:1 | Fails | Lc -7.5 | 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
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DADF
oklch(88.5% 0.009 242.9)
-
Step 300
300
#B9C2CC
oklch(81% 0.017 250.9)
-
Step 400
400
#94A2B2
oklch(70.6% 0.028 251.7)
-
Step 500
500
#7A8B9F
oklch(63% 0.036 252.6)
-
Step 600
600
#63758A
oklch(55.6% 0.039 252.5)
-
Step 700
700
#526375
oklch(49.2% 0.036 250)
-
Step 800
800
#43505F
oklch(42.6% 0.03 252.2)
-
Step 900
900 (this color)
#343E49
oklch(35.9% 0.023 250.9)
-
Step 950
950
#21272E
oklch(27% 0.016 252.4)
#343E49 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) | #3A3E4A | 0.010 |
| Deuteranopia (no green cones) | #383C49 | 0.009 |
| Tritanopia (no blue cones) | #2E4042 | 0.018 |
| Achromatopsia (no color) | #3D3D3D | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343E49
#343E49
oklch(35.9% 0.023 250.9)
- #453B30
#453B30
oklch(35.9% 0.023 69.7)
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 #343E49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.017
- Charcoal Grey #3C4142 ΔE 0.022
- Charcoal #264653 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.035
- Gunmetal #293241 ΔE 0.045
- Midnight Green #073B4C ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.054
Use #343E49 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.