#3F6F8A
Closest named color: Metallic Blue (#4F738E). oklch(51.9% 0.068 234.8), rgb(63, 111, 138).
Aa
White text reads best on this color (5.45:1).
About this color
#3F6F8A is a medium-dark, muted blue. In OKLCH its lightness is 52%, its chroma 0.068 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.023 away. White text reads best on it, at 5.45:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.85:1 |
| White text | 5.45:1 |
Values
| HEX | #3F6F8A |
| RGB | rgb(63, 111, 138) |
| HSL | hsl(202, 37%, 39%) |
| OKLCH | oklch(51.9% 0.068 234.8) |
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 #3F6F8A | 5.45:1 | AA | Lc -82.4 | Fine for body text |
| Black text on #3F6F8A | 3.85:1 | AA large text | Lc 27.0 | Dividers and decoration only |
| #3F6F8A text on white | 5.45:1 | AA | Lc 77.1 | Fine for body text |
| #3F6F8A text on black | 3.85:1 | AA large text | Lc -24.7 | 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
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CEDBE4
oklch(88.4% 0.019 237.8)
-
Step 300
300
#ADC5D3
oklch(81% 0.033 233.4)
-
Step 400
400
#81A6BD
oklch(70.6% 0.053 235.8)
-
Step 500
500
#6090AC
oklch(63% 0.067 234.9)
-
Step 600
600
#467A98
oklch(55.6% 0.073 235.5)
-
Step 700
700 (this color)
#3F6F8A
oklch(51.9% 0.068 234.8)
-
Step 800
800
#2E5469
oklch(42.7% 0.056 234.3)
-
Step 900
900
#2A4555
oklch(37.6% 0.043 235.6)
-
Step 950
950
#192932
oklch(27.1% 0.027 233.8)
#3F6F8A 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) | #626E8B | 0.043 |
| Deuteranopia (no green cones) | #58668A | 0.037 |
| Tritanopia (no blue cones) | #0F7678 | 0.052 |
| Achromatopsia (no color) | #696969 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6F8A
#3F6F8A
oklch(51.9% 0.068 234.8)
- #875E42
#875E42
oklch(51.9% 0.068 55)
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 #3F6F8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.023
- Muted Blue #3B719F ΔE 0.033
- Dull Blue #49759C ΔE 0.034
- Sea Blue #047495 ΔE 0.034
- Denim #3B638C ΔE 0.038
- Ocean Blue #03719C ΔE 0.040
- Ocean #017B92 ΔE 0.042
- Cerulean #457B9D ΔE 0.042
Use #3F6F8A 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.