#3F4855
Closest named color: Dark Grey Blue (#29465B). oklch(39.9% 0.025 257.5), rgb(63, 72, 85).
Aa
White text reads best on this color (9.25:1).
About this color
#3F4855 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.032 away. White text reads best on it, at 9.25:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #3F4855 |
| RGB | rgb(63, 72, 85) |
| HSL | hsl(215, 15%, 29%) |
| OKLCH | oklch(39.9% 0.025 257.5) |
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 #3F4855 | 9.25:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #3F4855 | 2.26:1 | Fails | Lc 12.6 | Not readable |
| #3F4855 text on white | 9.25:1 | AAA | Lc 91.4 | Preferred for body text |
| #3F4855 text on black | 2.26:1 | Fails | Lc -11.0 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5D9E0
oklch(88.4% 0.011 261.8)
-
Step 300
300
#B9C1CD
oklch(80.8% 0.019 258.4)
-
Step 400
400
#95A2B4
oklch(70.8% 0.03 256.5)
-
Step 500
500
#7B8BA1
oklch(63.2% 0.038 256.4)
-
Step 600
600
#64748C
oklch(55.5% 0.042 258.4)
-
Step 700
700
#536277
oklch(49.2% 0.039 256.8)
-
Step 800
800
#445061
oklch(42.8% 0.032 257.1)
-
Step 900
900 (this color)
#3F4855
oklch(39.9% 0.025 257.5)
-
Step 950
950
#22272E
oklch(27.1% 0.015 256.8)
#3F4855 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) | #444856 | 0.008 |
| Deuteranopia (no green cones) | #414655 | 0.007 |
| Tritanopia (no blue cones) | #394B4C | 0.023 |
| Achromatopsia (no color) | #474747 | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4855
#3F4855
oklch(39.9% 0.025 257.5)
- #4F4638
#4F4638
oklch(39.9% 0.026 78.8)
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 #3F4855, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.032
- Dark Slate Gray #2F4F4F ΔE 0.034
- Charcoal Grey #3C4142 ΔE 0.035
- Charcoal #264653 ΔE 0.035
- Onyx #343A40 ΔE 0.055
- Dark Teal #014D4E ΔE 0.060
- Deep Teal #00555A ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.065
Use #3F4855 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.