#3F4752
Closest named color: Charcoal Grey (#3C4142). oklch(39.5% 0.021 256.4), rgb(63, 71, 82).
Aa
White text reads best on this color (9.39:1).
About this color
#3F4752 is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.030 away. White text reads best on it, at 9.39:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.23:1 |
| White text | 9.39:1 |
Values
| HEX | #3F4752 |
| RGB | rgb(63, 71, 82) |
| HSL | hsl(215, 13%, 28%) |
| OKLCH | oklch(39.5% 0.021 256.4) |
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 #3F4752 | 9.39:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #3F4752 | 2.23:1 | Fails | Lc 12.2 | Not readable |
| #3F4752 text on white | 9.39:1 | AAA | Lc 91.7 | Preferred for body text |
| #3F4752 text on black | 2.23:1 | Fails | Lc -10.6 | 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
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5D9DF
oklch(88.4% 0.009 258.3)
-
Step 300
300
#BAC1CB
oklch(80.8% 0.016 257.2)
-
Step 400
400
#96A2B1
oklch(70.8% 0.026 254)
-
Step 500
500
#7D8B9E
oklch(63.2% 0.033 256.1)
-
Step 600
600
#667588
oklch(55.7% 0.035 254.4)
-
Step 700
700
#556274
oklch(49.2% 0.033 256.6)
-
Step 800
800
#45505E
oklch(42.7% 0.027 254.6)
-
Step 900
900 (this color)
#3F4752
oklch(39.5% 0.021 256.4)
-
Step 950
950
#22272D
oklch(27% 0.013 253)
#3F4752 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) | #434753 | 0.007 |
| Deuteranopia (no green cones) | #414552 | 0.007 |
| Tritanopia (no blue cones) | #3A494B | 0.017 |
| Achromatopsia (no color) | #464646 | 0.021 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4752
#3F4752
oklch(39.5% 0.021 256.4)
- #4D453A
#4D453A
oklch(39.5% 0.021 75.8)
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 #3F4752, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.033
- Charcoal #264653 ΔE 0.034
- Dark Slate Gray #2F4F4F ΔE 0.034
- Onyx #343A40 ΔE 0.051
- Dark Teal #014D4E ΔE 0.059
- Deep Teal #00555A ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.062
Use #3F4752 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.