#3F444F
Closest named color: Charcoal Grey (#3C4142). oklch(38.6% 0.02 266), rgb(63, 68, 79).
Aa
White text reads best on this color (9.76:1).
About this color
#3F444F is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.023 away. White text reads best on it, at 9.76:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.15:1 |
| White text | 9.76:1 |
Values
| HEX | #3F444F |
| RGB | rgb(63, 68, 79) |
| HSL | hsl(221, 11%, 28%) |
| OKLCH | oklch(38.6% 0.02 266) |
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 #3F444F | 9.76:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #3F444F | 2.15:1 | Fails | Lc 11.3 | Not readable |
| #3F444F text on white | 9.76:1 | AAA | Lc 92.7 | Preferred for body text |
| #3F444F text on black | 2.15:1 | Fails | Lc -9.8 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D6D9DF
oklch(88.5% 0.009 264.5)
-
Step 300
300
#BCC1CB
oklch(81% 0.015 264.5)
-
Step 400
400
#9AA1B0
oklch(70.8% 0.023 265.7)
-
Step 500
500
#81899D
oklch(63% 0.031 268.2)
-
Step 600
600
#6A7387
oklch(55.5% 0.033 266.1)
-
Step 700
700
#586173
oklch(49.2% 0.031 264.2)
-
Step 800
800
#484F5D
oklch(42.7% 0.025 264.3)
-
Step 900
900 (this color)
#3F444F
oklch(38.6% 0.02 266)
-
Step 950
950
#23262D
oklch(26.9% 0.014 267)
#3F444F 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) | #414550 | 0.005 |
| Deuteranopia (no green cones) | #3F434F | 0.003 |
| Tritanopia (no blue cones) | #3B4648 | 0.017 |
| Achromatopsia (no color) | #444444 | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F444F
#3F444F
oklch(38.6% 0.02 266)
- #494338
#494338
oklch(38.5% 0.02 82.7)
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 #3F444F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.023
- Charcoal #264653 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.034
- Dark Slate Gray #2F4F4F ΔE 0.040
- Onyx #343A40 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.056
- Dark Teal #014D4E ΔE 0.061
- Deep Teal #00555A ΔE 0.068
Use #3F444F 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.