#3F645B
Closest named color: Dark Green Blue (#1F6357). oklch(47.2% 0.045 177.2), rgb(63, 100, 91).
Aa
White text reads best on this color (6.59:1).
About this color
#3F645B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 47%, its chroma 0.045 and its hue 177°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.031 away. White text reads best on it, at 6.59:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (47%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 3.18:1 |
| White text | 6.59:1 |
Values
| HEX | #3F645B |
| RGB | rgb(63, 100, 91) |
| HSL | hsl(165, 23%, 32%) |
| OKLCH | oklch(47.2% 0.045 177.2) |
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 #3F645B | 6.59:1 | AA | Lc -87.6 | Fine for body text |
| Black text on #3F645B | 3.18:1 | AA large text | Lc 21.5 | Dividers and decoration only |
| #3F645B text on white | 6.59:1 | AA | Lc 82.6 | Fine for body text |
| #3F645B text on black | 3.18:1 | AA large text | Lc -19.3 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E6EBEA
oklch(93.6% 0.006 183)
-
Step 200
200
#D1DCD9
oklch(88.5% 0.013 178)
-
Step 300
300
#B3C5C0
oklch(80.8% 0.021 177.3)
-
Step 400
400
#8AA8A0
oklch(70.7% 0.035 177.3)
-
Step 500
500
#6D9389
oklch(63.2% 0.045 176.8)
-
Step 600
600
#547D73
oklch(55.6% 0.048 177.5)
-
Step 700
700 (this color)
#3F645B
oklch(47.2% 0.045 177.2)
-
Step 800
800
#38564F
oklch(42.7% 0.038 178.2)
-
Step 900
900
#314741
oklch(37.8% 0.029 175.9)
-
Step 950
950
#1D2926
oklch(26.9% 0.017 177.9)
#3F645B 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) | #61605B | 0.047 |
| Deuteranopia (no green cones) | #5B5B5C | 0.046 |
| Tritanopia (no blue cones) | #346561 | 0.013 |
| Achromatopsia (no color) | #5D5D5D | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F645B
#3F645B
oklch(47.2% 0.045 177.2)
- #71515C
#71515C
oklch(47.3% 0.046 356.6)
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 #3F645B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.031
- Dark Aqua #05696B ΔE 0.040
- Slate #516572 ΔE 0.046
- Petrol #005F6A ΔE 0.053
- Dark Aquamarine #017371 ΔE 0.053
- Deep Turquoise #017374 ΔE 0.055
- YInMn Blue #415A77 ΔE 0.064
- Pine #2B5D34 ΔE 0.066
Use #3F645B 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.