#3F646B
Closest named color: Slate (#516572). oklch(47.8% 0.044 210.8), rgb(63, 100, 107).
Aa
White text reads best on this color (6.46:1).
About this color
#3F646B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 48%, its chroma 0.044 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.027 away. White text reads best on it, at 6.46:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.24:1 |
| White text | 6.46:1 |
Values
| HEX | #3F646B |
| RGB | rgb(63, 100, 107) |
| HSL | hsl(190, 26%, 33%) |
| OKLCH | oklch(47.8% 0.044 210.8) |
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 #3F646B | 6.46:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #3F646B | 3.24:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #3F646B text on white | 6.46:1 | AA | Lc 82.0 | Fine for body text |
| #3F646B text on black | 3.24:1 | AA large text | Lc -19.9 | Dividers and decoration only |
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 700.
-
Step 50
50
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D1DBDD
oklch(88.4% 0.011 211)
-
Step 300
300
#B2C5C8
oklch(81% 0.021 208.1)
-
Step 400
400
#89A7AC
oklch(70.7% 0.034 208.8)
-
Step 500
500
#6B9198
oklch(63.1% 0.043 210.1)
-
Step 600
600
#527B83
oklch(55.6% 0.047 211.1)
-
Step 700
700 (this color)
#3F646B
oklch(47.8% 0.044 210.8)
-
Step 800
800
#37555A
oklch(42.8% 0.036 209)
-
Step 900
900
#30464A
oklch(37.8% 0.028 210)
-
Step 950
950
#1C292B
oklch(27% 0.018 207.9)
#3F646B 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) | #5E616B | 0.042 |
| Deuteranopia (no green cones) | #575C6B | 0.038 |
| Tritanopia (no blue cones) | #2D6766 | 0.023 |
| Achromatopsia (no color) | #5E5E5E | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F646B
#3F646B
oklch(47.8% 0.044 210.8)
- #74544E
#74544E
oklch(47.8% 0.044 30.8)
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 #3F646B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.027
- Dark Aqua #05696B ΔE 0.039
- YInMn Blue #415A77 ΔE 0.042
- Dark Green Blue #1F6357 ΔE 0.047
- Petrol #005F6A ΔE 0.047
- Deep Turquoise #017374 ΔE 0.052
- Dark Aquamarine #017371 ΔE 0.052
- Dusty Grape #545775 ΔE 0.054
Use #3F646B 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.