#3F6978
Closest named color: Slate (#516572). oklch(49.6% 0.053 222.8), rgb(63, 105, 120).
Aa
White text reads best on this color (5.99:1).
About this color
#3F6978 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 50%, its chroma 0.053 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.023 away. White text reads best on it, at 5.99:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.50:1 |
| White text | 5.99:1 |
Values
| HEX | #3F6978 |
| RGB | rgb(63, 105, 120) |
| HSL | hsl(196, 31%, 36%) |
| OKLCH | oklch(49.6% 0.053 222.8) |
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 #3F6978 | 5.99:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #3F6978 | 3.50:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #3F6978 text on white | 5.99:1 | AA | Lc 79.9 | Fine for body text |
| #3F6978 text on black | 3.50:1 | AA large text | Lc -21.9 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D0DBE0
oklch(88.5% 0.014 226.6)
-
Step 300
300
#B0C5CD
oklch(81% 0.026 222.7)
-
Step 400
400
#86A7B3
oklch(70.8% 0.04 222)
-
Step 500
500
#6691A1
oklch(63.1% 0.053 223.1)
-
Step 600
600
#4D7B8C
oklch(55.6% 0.057 223.5)
-
Step 700
700 (this color)
#3F6978
oklch(49.6% 0.053 222.8)
-
Step 800
800
#335460
oklch(42.6% 0.043 223.1)
-
Step 900
900
#2D464F
oklch(37.8% 0.034 222.5)
-
Step 950
950
#1B292E
oklch(27% 0.021 222)
#3F6978 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) | #606779 | 0.042 |
| Deuteranopia (no green cones) | #586078 | 0.039 |
| Tritanopia (no blue cones) | #246E6E | 0.035 |
| Achromatopsia (no color) | #636363 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6978
#3F6978
oklch(49.6% 0.053 222.8)
- #7C594A
#7C594A
oklch(49.7% 0.052 44.2)
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 #3F6978, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.023
- Denim #3B638C ΔE 0.042
- Dark Aqua #05696B ΔE 0.046
- YInMn Blue #415A77 ΔE 0.046
- Deep Turquoise #017374 ΔE 0.046
- Metallic Blue #4F738E ΔE 0.047
- Dark Aquamarine #017371 ΔE 0.049
- Deep Aqua #08787F ΔE 0.050
Use #3F6978 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.