#3F4F63
Closest named color: YInMn Blue (#415A77). oklch(42.2% 0.039 254.2), rgb(63, 79, 99).
Aa
White text reads best on this color (8.36:1).
About this color
#3F4F63 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.039 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.041 away. White text reads best on it, at 8.36:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.50:1 |
| White text | 8.36:1 |
Values
| HEX | #3F4F63 |
| RGB | rgb(63, 79, 99) |
| HSL | hsl(213, 22%, 32%) |
| OKLCH | oklch(42.2% 0.039 254.2) |
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 #3F4F63 | 8.36:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #3F4F63 | 2.50:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #3F4F63 text on white | 8.36:1 | AAA | Lc 88.8 | Fine for body text |
| #3F4F63 text on black | 2.50:1 | Fails | Lc -13.4 | 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 800.
-
Step 50
50
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4DAE2
oklch(88.6% 0.013 255.5)
-
Step 300
300
#B7C2D0
oklch(81% 0.023 254.4)
-
Step 400
400
#91A2B8
oklch(70.6% 0.038 254.9)
-
Step 500
500
#768BA6
oklch(63% 0.048 254.8)
-
Step 600
600
#5F7591
oklch(55.6% 0.051 254.7)
-
Step 700
700
#4E627B
oklch(49% 0.047 254.3)
-
Step 800
800 (this color)
#3F4F63
oklch(42.2% 0.039 254.2)
-
Step 900
900
#374352
oklch(37.8% 0.03 254.2)
-
Step 950
950
#202730
oklch(27% 0.02 254.8)
#3F4F63 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) | #485064 | 0.014 |
| Deuteranopia (no green cones) | #444C63 | 0.011 |
| Tritanopia (no blue cones) | #345356 | 0.033 |
| Achromatopsia (no color) | #4E4E4E | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4F63
#3F4F63
oklch(42.2% 0.039 254.2)
- #5B4B36
#5B4B36
oklch(42.3% 0.039 74)
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 #3F4F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.044
- Dusty Grape #545775 ΔE 0.049
- Charcoal #264653 ΔE 0.051
- Dusk #4E5481 ΔE 0.056
- Deep Teal #00555A ΔE 0.057
- Petrol #005F6A ΔE 0.061
Use #3F4F63 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.