#3F574F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(43.5% 0.032 172.2), rgb(63, 87, 79).
Aa
White text reads best on this color (7.81:1).
About this color
#3F574F is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.032 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.035 away. White text reads best on it, at 7.81:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.68:1 |
| White text | 7.81:1 |
Values
| HEX | #3F574F |
| RGB | rgb(63, 87, 79) |
| HSL | hsl(160, 16%, 29%) |
| OKLCH | oklch(43.5% 0.032 172.2) |
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 #3F574F | 7.81:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #3F574F | 2.68:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #3F574F text on white | 7.81:1 | AAA | Lc 87.1 | Fine for body text |
| #3F574F text on black | 2.68:1 | Fails | Lc -15.0 | 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 800.
-
Step 50
50
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E6EBE9
oklch(93.6% 0.006 170.4)
-
Step 200
200
#D3DBD8
oklch(88.4% 0.01 171.8)
-
Step 300
300
#B5C5BF
oklch(80.9% 0.019 171.4)
-
Step 400
400
#8FA79E
oklch(70.7% 0.03 170.8)
-
Step 500
500
#729187
oklch(63% 0.038 173.4)
-
Step 600
600
#5A7C71
oklch(55.7% 0.042 172.7)
-
Step 700
700
#4A685E
oklch(49.1% 0.039 172)
-
Step 800
800 (this color)
#3F574F
oklch(43.5% 0.032 172.2)
-
Step 900
900
#344640
oklch(37.7% 0.025 172.5)
-
Step 950
950
#1F2926
oklch(27% 0.015 174.9)
#3F574F 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) | #55544F | 0.033 |
| Deuteranopia (no green cones) | #515150 | 0.031 |
| Tritanopia (no blue cones) | #395755 | 0.012 |
| Achromatopsia (no color) | #525252 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F574F
#3F574F
oklch(43.5% 0.032 172.2)
- #604A53
#604A53
oklch(43.5% 0.033 352.1)
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 #3F574F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.035
- Dark Green Blue #1F6357 ΔE 0.043
- Deep Teal #00555A ΔE 0.051
- Petrol #005F6A ΔE 0.055
- Dark Blue Green #005249 ΔE 0.057
- Pine #2B5D34 ΔE 0.058
- Dark Aqua #05696B ΔE 0.065
- YInMn Blue #415A77 ΔE 0.065
Use #3F574F 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.