#3F4761
Closest named color: Dark Grey Blue (#29465B). oklch(40.2% 0.045 271), rgb(63, 71, 97).
Aa
White text reads best on this color (9.18:1).
About this color
#3F4761 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.045 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.033 away. White text reads best on it, at 9.18:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.28:1 |
| White text | 9.18:1 |
Values
| HEX | #3F4761 |
| RGB | rgb(63, 71, 97) |
| HSL | hsl(226, 21%, 31%) |
| OKLCH | oklch(40.2% 0.045 271) |
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 #3F4761 | 9.18:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #3F4761 | 2.28:1 | Fails | Lc 12.8 | Not readable |
| #3F4761 text on white | 9.18:1 | AAA | Lc 91.2 | Preferred for body text |
| #3F4761 text on black | 2.28:1 | Fails | Lc -11.2 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7EAF1
oklch(93.7% 0.01 267.4)
-
Step 200
200
#D4D9E6
oklch(88.5% 0.019 269.1)
-
Step 300
300
#B8C0D7
oklch(80.9% 0.034 270.4)
-
Step 400
400
#949FC3
oklch(70.6% 0.054 271.7)
-
Step 500
500
#7A88B4
oklch(63.2% 0.068 270.7)
-
Step 600
600
#6371A0
oklch(55.6% 0.075 271.1)
-
Step 700
700
#525E89
oklch(49% 0.071 271.7)
-
Step 800
800
#434D6F
oklch(42.6% 0.058 271.2)
-
Step 900
900 (this color)
#3F4761
oklch(40.2% 0.045 271)
-
Step 950
950
#212635
oklch(27.1% 0.029 270.1)
#3F4761 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) | #3F4962 | 0.006 |
| Deuteranopia (no green cones) | #3C4660 | 0.006 |
| Tritanopia (no blue cones) | #354C50 | 0.041 |
| Achromatopsia (no color) | #484848 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4761
#3F4761
oklch(40.2% 0.045 271)
- #51472B
#51472B
oklch(40.1% 0.045 90.5)
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 #3F4761, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.033
- Charcoal #264653 ΔE 0.043
- Dark Slate Gray #2F4F4F ΔE 0.051
- Charcoal Grey #3C4142 ΔE 0.052
- YInMn Blue #415A77 ΔE 0.061
- Dusty Grape #545775 ΔE 0.065
- Dusk #4E5481 ΔE 0.066
- Onyx #343A40 ΔE 0.066
Use #3F4761 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.