#3F4953
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40% 0.021 248.4), rgb(63, 73, 83).
Aa
White text reads best on this color (9.17:1).
About this color
#3F4953 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.030 away. White text reads best on it, at 9.17:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.28:1 |
| White text | 9.17:1 |
Values
| HEX | #3F4953 |
| RGB | rgb(63, 73, 83) |
| HSL | hsl(210, 14%, 29%) |
| OKLCH | oklch(40% 0.021 248.4) |
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 #3F4953 | 9.17:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #3F4953 | 2.28:1 | Fails | Lc 12.8 | Not readable |
| #3F4953 text on white | 9.17:1 | AAA | Lc 91.1 | Preferred for body text |
| #3F4953 text on black | 2.28:1 | Fails | Lc -11.2 | 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
#D5DADF
oklch(88.6% 0.009 247.9)
-
Step 300
300
#B9C2CB
oklch(81% 0.016 248)
-
Step 400
400
#95A2B0
oklch(70.6% 0.025 250.2)
-
Step 500
500
#7A8C9D
oklch(63.2% 0.033 246.8)
-
Step 600
600
#637688
oklch(55.7% 0.036 247)
-
Step 700
700
#526373
oklch(49.2% 0.033 246.9)
-
Step 800
800
#43515E
oklch(42.8% 0.028 246.5)
-
Step 900
900 (this color)
#3F4953
oklch(40% 0.021 248.4)
-
Step 950
950
#21272D
oklch(26.9% 0.014 248.4)
#3F4953 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) | #454954 | 0.010 |
| Deuteranopia (no green cones) | #434753 | 0.008 |
| Tritanopia (no blue cones) | #3A4B4C | 0.017 |
| Achromatopsia (no color) | #484848 | 0.021 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4953
#3F4953
oklch(40% 0.021 248.4)
- #50463C
#50463C
oklch(40.1% 0.021 67.2)
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 #3F4953, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.030
- Charcoal Grey #3C4142 ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.035
- Charcoal #264653 ΔE 0.036
- Onyx #343A40 ΔE 0.056
- Dark Teal #014D4E ΔE 0.057
- Deep Teal #00555A ΔE 0.058
- Dark Blue Green #005249 ΔE 0.065
Use #3F4953 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.