#3F707C
Closest named color: Slate (#516572). oklch(51.5% 0.056 215.3), rgb(63, 112, 124).
Aa
White text reads best on this color (5.49:1).
About this color
#3F707C is a medium-dark, muted teal or cyan. In OKLCH its lightness is 52%, its chroma 0.056 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.035 away. White text reads best on it, at 5.49:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.82:1 |
| White text | 5.49:1 |
Values
| HEX | #3F707C |
| RGB | rgb(63, 112, 124) |
| HSL | hsl(192, 33%, 37%) |
| OKLCH | oklch(51.5% 0.056 215.3) |
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 #3F707C | 5.49:1 | AA | Lc -82.6 | Fine for body text |
| Black text on #3F707C | 3.82:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #3F707C text on white | 5.49:1 | AA | Lc 77.3 | Fine for body text |
| #3F707C text on black | 3.82:1 | AA large text | Lc -24.4 | 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
#E4EBED
oklch(93.5% 0.008 216.6)
-
Step 200
200
#CFDCDF
oklch(88.6% 0.015 213.1)
-
Step 300
300
#AEC5CC
oklch(80.8% 0.027 218)
-
Step 400
400
#82A8B2
oklch(70.7% 0.044 215.6)
-
Step 500
500
#61929F
oklch(63% 0.056 216.3)
-
Step 600
600
#477D8A
oklch(55.7% 0.061 215)
-
Step 700
700 (this color)
#3F707C
oklch(51.5% 0.056 215.3)
-
Step 800
800
#2F565F
oklch(42.8% 0.047 214.3)
-
Step 900
900
#2A474E
oklch(37.8% 0.037 214.7)
-
Step 950
950
#19292E
oklch(26.9% 0.023 219.4)
#3F707C 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) | #676D7D | 0.050 |
| Deuteranopia (no green cones) | #5E667C | 0.046 |
| Tritanopia (no blue cones) | #1F7574 | 0.033 |
| Achromatopsia (no color) | #696969 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F707C
#3F707C
oklch(51.5% 0.056 215.3)
- #855C51
#855C51
oklch(51.5% 0.057 35.6)
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 #3F707C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.035
- Metallic Blue #4F738E ΔE 0.036
- Deep Aqua #08787F ΔE 0.036
- Deep Turquoise #017374 ΔE 0.039
- Dark Aquamarine #017371 ΔE 0.042
- Bluegreen #017A79 ΔE 0.043
- Ocean #017B92 ΔE 0.045
- Sea Blue #047495 ΔE 0.046
Use #3F707C 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.