#3F475F
Closest named color: Dark Grey Blue (#29465B). oklch(40.1% 0.042 270.2), rgb(63, 71, 95).
Aa
White text reads best on this color (9.21:1).
About this color
#3F475F is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.042 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.031 away. White text reads best on it, at 9.21:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #3F475F |
| RGB | rgb(63, 71, 95) |
| HSL | hsl(225, 20%, 31%) |
| OKLCH | oklch(40.1% 0.042 270.2) |
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 #3F475F | 9.21:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #3F475F | 2.27:1 | Fails | Lc 12.7 | Not readable |
| #3F475F text on white | 9.21:1 | AAA | Lc 91.2 | Preferred for body text |
| #3F475F text on black | 2.27:1 | Fails | Lc -11.1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D4D9E5
oklch(88.5% 0.017 267.8)
-
Step 300
300
#B8C0D6
oklch(80.9% 0.032 269.8)
-
Step 400
400
#94A0C1
oklch(70.8% 0.05 269.4)
-
Step 500
500
#7A88B1
oklch(63.1% 0.064 269.9)
-
Step 600
600
#63719D
oklch(55.5% 0.071 270.4)
-
Step 700
700
#525F86
oklch(49.1% 0.065 269.7)
-
Step 800
800
#434E6D
oklch(42.8% 0.054 269)
-
Step 900
900 (this color)
#3F475F
oklch(40.1% 0.042 270.2)
-
Step 950
950
#212634
oklch(27% 0.027 269.3)
#3F475F 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) | #3F4960 | 0.006 |
| Deuteranopia (no green cones) | #3D465E | 0.005 |
| Tritanopia (no blue cones) | #364C4F | 0.039 |
| Achromatopsia (no color) | #474747 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F475F
#3F475F
oklch(40.1% 0.042 270.2)
- #51472D
#51472D
oklch(40.1% 0.042 89.3)
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 #3F475F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.031
- Charcoal #264653 ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.048
- Charcoal Grey #3C4142 ΔE 0.049
- YInMn Blue #415A77 ΔE 0.063
- Onyx #343A40 ΔE 0.063
- Dusty Grape #545775 ΔE 0.066
- Dark Blue Grey #1F3B4D ΔE 0.067
Use #3F475F 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.