#3F708E
Closest named color: Metallic Blue (#4F738E). oklch(52.3% 0.071 237.2), rgb(63, 112, 142).
Aa
White text reads best on this color (5.35:1).
About this color
#3F708E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.071 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.021 away. White text reads best on it, at 5.35:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.91:1 |
| White text | 5.35:1 |
Values
| HEX | #3F708E |
| RGB | rgb(63, 112, 142) |
| HSL | hsl(203, 39%, 40%) |
| OKLCH | oklch(52.3% 0.071 237.2) |
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 #3F708E | 5.35:1 | AA | Lc -81.9 | Fine for body text |
| Black text on #3F708E | 3.91:1 | AA large text | Lc 27.5 | Dividers and decoration only |
| #3F708E text on white | 5.35:1 | AA | Lc 76.6 | Fine for body text |
| #3F708E text on black | 3.91:1 | AA large text | Lc -25.2 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CEDBE4
oklch(88.4% 0.019 237.8)
-
Step 300
300
#ADC4D4
oklch(80.8% 0.034 238.3)
-
Step 400
400
#80A6BF
oklch(70.6% 0.055 237.4)
-
Step 500
500
#5F90AF
oklch(63.1% 0.071 237.2)
-
Step 600
600
#447A9B
oklch(55.6% 0.077 237.2)
-
Step 700
700 (this color)
#3F708E
oklch(52.3% 0.071 237.2)
-
Step 800
800
#2D546B
oklch(42.7% 0.059 236.2)
-
Step 900
900
#294557
oklch(37.6% 0.046 237.9)
-
Step 950
950
#182933
oklch(27.1% 0.029 235.2)
#3F708E 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) | #626F8F | 0.042 |
| Deuteranopia (no green cones) | #57678E | 0.036 |
| Tritanopia (no blue cones) | #05787A | 0.057 |
| Achromatopsia (no color) | #6B6B6B | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F708E
#3F708E
oklch(52.3% 0.071 237.2)
- #895F40
#895F40
oklch(52.3% 0.071 56.9)
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 #3F708E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.021
- Muted Blue #3B719F ΔE 0.027
- Dull Blue #49759C ΔE 0.028
- Sea Blue #047495 ΔE 0.032
- Ocean Blue #03719C ΔE 0.037
- Cerulean #457B9D ΔE 0.037
- Denim #3B638C ΔE 0.040
- Flat Blue #3C73A8 ΔE 0.040
Use #3F708E 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.