#3F425C
Closest named color: Dark Grey Blue (#29465B). oklch(38.7% 0.044 279), rgb(63, 66, 92).
Aa
White text reads best on this color (9.78:1).
About this color
#3F425C is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.044 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.032 away. White text reads best on it, at 9.78:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.14:1 |
| White text | 9.78:1 |
Values
| HEX | #3F425C |
| RGB | rgb(63, 66, 92) |
| HSL | hsl(234, 19%, 30%) |
| OKLCH | oklch(38.7% 0.044 279) |
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 #3F425C | 9.78:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #3F425C | 2.14:1 | Fails | Lc 11.2 | Not readable |
| #3F425C text on white | 9.78:1 | AAA | Lc 92.7 | Preferred for body text |
| #3F425C text on black | 2.14:1 | Fails | Lc -9.8 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9F0
oklch(93.5% 0.009 279.7)
-
Step 200
200
#D6D8E6
oklch(88.5% 0.019 279.5)
-
Step 300
300
#BBBFD6
oklch(80.9% 0.033 277.8)
-
Step 400
400
#999EC2
oklch(70.8% 0.053 278.8)
-
Step 500
500
#8086B3
oklch(63.2% 0.068 278.4)
-
Step 600
600
#6A6F9E
oklch(55.6% 0.073 279.1)
-
Step 700
700
#585D87
oklch(49.2% 0.067 278.4)
-
Step 800
800
#484C6E
oklch(42.8% 0.057 278.5)
-
Step 900
900 (this color)
#3F425C
oklch(38.7% 0.044 279)
-
Step 950
950
#232534
oklch(26.9% 0.028 278.4)
#3F425C 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) | #3A455D | 0.011 |
| Deuteranopia (no green cones) | #39435B | 0.010 |
| Tritanopia (no blue cones) | #38474B | 0.040 |
| Achromatopsia (no color) | #444444 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F425C
#3F425C
oklch(38.7% 0.044 279)
- #4A4529
#4A4529
oklch(38.8% 0.044 99.4)
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 #3F425C, 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
- Charcoal #264653 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.045
- Onyx #343A40 ΔE 0.054
- Dark Slate Gray #2F4F4F ΔE 0.057
- Dark Blue Grey #1F3B4D ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.068
- Twilight Blue #0A437A ΔE 0.072
Use #3F425C 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.