#3F4E61
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.9% 0.037 254.5), rgb(63, 78, 97).
Aa
White text reads best on this color (8.48:1).
About this color
#3F4E61 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.037 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.040 away. White text reads best on it, at 8.48:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.47:1 |
| White text | 8.48:1 |
Values
| HEX | #3F4E61 |
| RGB | rgb(63, 78, 97) |
| HSL | hsl(214, 21%, 31%) |
| OKLCH | oklch(41.9% 0.037 254.5) |
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 #3F4E61 | 8.48:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #3F4E61 | 2.47:1 | Fails | Lc 14.8 | Not readable |
| #3F4E61 text on white | 8.48:1 | AAA | Lc 89.2 | Fine for body text |
| #3F4E61 text on black | 2.47:1 | Fails | Lc -13.0 | 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 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
#D4DAE1
oklch(88.6% 0.012 252.1)
-
Step 300
300
#B7C2CF
oklch(81% 0.022 252.5)
-
Step 400
400
#92A2B6
oklch(70.6% 0.034 254.1)
-
Step 500
500
#778BA4
oklch(63% 0.044 254.2)
-
Step 600
600
#607590
oklch(55.6% 0.049 254.9)
-
Step 700
700
#4F627A
oklch(49% 0.045 254.5)
-
Step 800
800 (this color)
#3F4E61
oklch(41.9% 0.037 254.5)
-
Step 900
900
#374351
oklch(37.8% 0.029 252.5)
-
Step 950
950
#20272F
oklch(26.9% 0.018 251.9)
#3F4E61 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) | #474F62 | 0.013 |
| Deuteranopia (no green cones) | #434B61 | 0.011 |
| Tritanopia (no blue cones) | #355254 | 0.032 |
| Achromatopsia (no color) | #4D4D4D | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E61
#3F4E61
oklch(41.9% 0.037 254.5)
- #594A36
#594A36
oklch(41.9% 0.037 74.5)
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 #3F4E61, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.041
- YInMn Blue #415A77 ΔE 0.045
- Charcoal #264653 ΔE 0.048
- Dusty Grape #545775 ΔE 0.052
- Deep Teal #00555A ΔE 0.057
- Charcoal Grey #3C4142 ΔE 0.058
- Dusk #4E5481 ΔE 0.059
Use #3F4E61 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.