#3F758D
Closest named color: Metallic Blue (#4F738E). oklch(53.5% 0.069 228.8), rgb(63, 117, 141).
Aa
White text reads best on this color (5.07:1).
About this color
#3F758D is a medium-dark, muted teal or cyan. In OKLCH its lightness is 54%, its chroma 0.069 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.018 away. White text reads best on it, at 5.07:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.14:1 |
| White text | 5.07:1 |
Values
| HEX | #3F758D |
| RGB | rgb(63, 117, 141) |
| HSL | hsl(198, 38%, 40%) |
| OKLCH | oklch(53.5% 0.069 228.8) |
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 #3F758D | 5.07:1 | AA | Lc -80.3 | Fine for body text |
| Black text on #3F758D | 4.14:1 | AA large text | Lc 29.2 | Dividers and decoration only |
| #3F758D text on white | 5.07:1 | AA | Lc 74.9 | Content text, not long reading |
| #3F758D text on black | 4.14:1 | AA large text | Lc -26.8 | 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 600.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CEDCE2
oklch(88.6% 0.017 225.2)
-
Step 300
300
#ADC5D1
oklch(80.9% 0.031 229.3)
-
Step 400
400
#81A7B9
oklch(70.7% 0.049 228.5)
-
Step 500
500
#6091A8
oklch(63.1% 0.063 229.1)
-
Step 600
600 (this color)
#3F758D
oklch(53.5% 0.069 228.8)
-
Step 700
700
#36687E
oklch(49.2% 0.064 228.7)
-
Step 800
800
#2E5566
oklch(42.8% 0.052 228.1)
-
Step 900
900
#294653
oklch(37.7% 0.041 228.3)
-
Step 950
950
#192931
oklch(27% 0.026 230.6)
#3F758D 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) | #69738E | 0.050 |
| Deuteranopia (no green cones) | #5D6B8D | 0.043 |
| Tritanopia (no blue cones) | #047C7D | 0.050 |
| Achromatopsia (no color) | #6E6E6E | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F758D
#3F758D
oklch(53.5% 0.069 228.8)
- #8E6149
#8E6149
oklch(53.4% 0.069 48.9)
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 #3F758D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.018
- Dull Blue #49759C ΔE 0.027
- Cerulean #457B9D ΔE 0.029
- Ocean #017B92 ΔE 0.032
- Sea Blue #047495 ΔE 0.034
- Stormy Blue #507B9C ΔE 0.034
- Muted Blue #3B719F ΔE 0.034
- Deep Aqua #08787F ΔE 0.042
Use #3F758D 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.