#3F454E
Closest named color: Charcoal Grey (#3C4142). oklch(38.8% 0.017 258.4), rgb(63, 69, 78).
Aa
White text reads best on this color (9.66:1).
About this color
#3F454E is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.017. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.022 away. White text reads best on it, at 9.66:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.017) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.17:1 |
| White text | 9.66:1 |
Values
| HEX | #3F454E |
| RGB | rgb(63, 69, 78) |
| HSL | hsl(216, 11%, 28%) |
| OKLCH | oklch(38.8% 0.017 258.4) |
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 #3F454E | 9.66:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #3F454E | 2.17:1 | Fails | Lc 11.5 | Not readable |
| #3F454E text on white | 9.66:1 | AAA | Lc 92.4 | Preferred for body text |
| #3F454E text on black | 2.17:1 | Fails | Lc -10.0 | 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
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D6D9DE
oklch(88.4% 0.008 260.7)
-
Step 300
300
#BCC1C9
oklch(80.9% 0.013 259.8)
-
Step 400
400
#99A1AE
oklch(70.7% 0.021 260.2)
-
Step 500
500
#808A9A
oklch(63.1% 0.027 259.8)
-
Step 600
600
#697484
oklch(55.5% 0.028 257.7)
-
Step 700
700
#586170
oklch(49% 0.027 260.7)
-
Step 800
800
#48505B
oklch(42.8% 0.021 256.4)
-
Step 900
900 (this color)
#3F454E
oklch(38.8% 0.017 258.4)
-
Step 950
950
#23272C
oklch(27.1% 0.011 254)
#3F454E 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) | #42454E | 0.005 |
| Deuteranopia (no green cones) | #41444E | 0.004 |
| Tritanopia (no blue cones) | #3B4748 | 0.015 |
| Achromatopsia (no color) | #444444 | 0.017 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F454E
#3F454E
oklch(38.8% 0.017 258.4)
- #4A443A
#4A443A
oklch(38.9% 0.018 80.6)
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 #3F454E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.022
- Charcoal #264653 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.035
- Dark Slate Gray #2F4F4F ΔE 0.037
- Onyx #343A40 ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.058
- Dark Teal #014D4E ΔE 0.059
- Deep Teal #00555A ΔE 0.065
Use #3F454E 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.