#343F4E
Closest named color: Onyx (#343A40). oklch(36.4% 0.03 256.2), rgb(52, 63, 78).
Aa
White text reads best on this color (10.67:1).
About this color
#343F4E is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.030. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.025 away. White text reads best on it, at 10.67:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.030) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.96:1 |
| White text | 10.67:1 |
Values
| HEX | #343F4E |
| RGB | rgb(52, 63, 78) |
| HSL | hsl(215, 20%, 25%) |
| OKLCH | oklch(36.4% 0.03 256.2) |
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 #343F4E | 10.67:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #343F4E | 1.96:1 | Fails | Lc 9.2 | Not readable |
| #343F4E text on white | 10.67:1 | AAA | Lc 94.8 | Preferred for body text |
| #343F4E text on black | 1.96:1 | Fails | Lc -7.9 | 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
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4DAE1
oklch(88.6% 0.012 252.1)
-
Step 300
300
#B7C2CF
oklch(81% 0.022 252.5)
-
Step 400
400
#92A2B7
oklch(70.7% 0.036 255.3)
-
Step 500
500
#788BA5
oklch(63.1% 0.045 256.3)
-
Step 600
600
#607591
oklch(55.6% 0.05 255.7)
-
Step 700
700
#50627B
oklch(49.1% 0.046 256.7)
-
Step 800
800
#415064
oklch(42.7% 0.038 255.7)
-
Step 900
900 (this color)
#343F4E
oklch(36.4% 0.03 256.2)
-
Step 950
950
#202730
oklch(27% 0.02 254.8)
#343F4E 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) | #3A404F | 0.010 |
| Deuteranopia (no green cones) | #373D4E | 0.008 |
| Tritanopia (no blue cones) | #2C4244 | 0.026 |
| Achromatopsia (no color) | #3E3E3E | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343F4E
#343F4E
oklch(36.4% 0.03 256.2)
- #473C2D
#473C2D
oklch(36.3% 0.029 75.2)
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 #343F4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.025
- Charcoal #264653 ΔE 0.026
- Charcoal Grey #3C4142 ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.032
- Gunmetal #293241 ΔE 0.049
- Midnight Green #073B4C ΔE 0.050
- Dark Slate Gray #2F4F4F ΔE 0.052
Use #343F4E 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.