#3F718E
Closest named color: Metallic Blue (#4F738E). oklch(52.6% 0.071 235.7), rgb(63, 113, 142).
Aa
White text reads best on this color (5.29:1).
About this color
#3F718E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.071 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.019 away. White text reads best on it, at 5.29:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.96:1 |
| White text | 5.29:1 |
Values
| HEX | #3F718E |
| RGB | rgb(63, 113, 142) |
| HSL | hsl(202, 39%, 40%) |
| OKLCH | oklch(52.6% 0.071 235.7) |
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 #3F718E | 5.29:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #3F718E | 3.96:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #3F718E text on white | 5.29:1 | AA | Lc 76.2 | Fine for body text |
| #3F718E text on black | 3.96:1 | AA large text | Lc -25.5 | 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
#CFDBE3
oklch(88.5% 0.017 236.7)
-
Step 300
300
#AEC4D3
oklch(80.8% 0.032 237.7)
-
Step 400
400
#82A6BC
oklch(70.6% 0.051 235.3)
-
Step 500
500
#6290AC
oklch(63.1% 0.065 235.9)
-
Step 600
600 (this color)
#3F718E
oklch(52.6% 0.071 235.7)
-
Step 700
700
#396781
oklch(49.2% 0.066 235)
-
Step 800
800
#305469
oklch(42.8% 0.054 235.6)
-
Step 900
900
#2B4555
oklch(37.6% 0.042 236.5)
-
Step 950
950
#192932
oklch(27.1% 0.027 233.8)
#3F718E 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) | #63708F | 0.043 |
| Deuteranopia (no green cones) | #58688E | 0.037 |
| Tritanopia (no blue cones) | #05797B | 0.055 |
| Achromatopsia (no color) | #6B6B6B | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F718E
#3F718E
oklch(52.6% 0.071 235.7)
- #8A6042
#8A6042
oklch(52.6% 0.07 56.1)
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 #3F718E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.019
- Dull Blue #49759C ΔE 0.027
- Muted Blue #3B719F ΔE 0.027
- Sea Blue #047495 ΔE 0.032
- Cerulean #457B9D ΔE 0.035
- Ocean Blue #03719C ΔE 0.038
- Ocean #017B92 ΔE 0.039
- Stormy Blue #507B9C ΔE 0.040
Use #3F718E 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.