#3F6583
Closest named color: Denim (#3B638C). oklch(49.1% 0.065 243.5), rgb(63, 101, 131).
Aa
White text reads best on this color (6.17:1).
About this color
#3F6583 is a medium-dark, muted blue. In OKLCH its lightness is 49%, its chroma 0.065 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.018 away. White text reads best on it, at 6.17:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.40:1 |
| White text | 6.17:1 |
Values
| HEX | #3F6583 |
| RGB | rgb(63, 101, 131) |
| HSL | hsl(206, 35%, 38%) |
| OKLCH | oklch(49.1% 0.065 243.5) |
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 #3F6583 | 6.17:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #3F6583 | 3.40:1 | AA large text | Lc 23.3 | Dividers and decoration only |
| #3F6583 text on white | 6.17:1 | AA | Lc 80.7 | Fine for body text |
| #3F6583 text on black | 3.40:1 | AA large text | Lc -21.1 | 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
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#D0DBE4
oklch(88.6% 0.017 242.5)
-
Step 300
300
#B0C3D4
oklch(80.8% 0.032 245.2)
-
Step 400
400
#86A5BE
oklch(70.7% 0.05 242.8)
-
Step 500
500
#678EAE
oklch(63% 0.065 243.8)
-
Step 600
600
#4E7899
oklch(55.5% 0.07 243.2)
-
Step 700
700 (this color)
#3F6583
oklch(49.1% 0.065 243.5)
-
Step 800
800
#34526A
oklch(42.6% 0.054 243.6)
-
Step 900
900
#2E4456
oklch(37.6% 0.041 243.9)
-
Step 950
950
#1B2833
oklch(27% 0.027 244.6)
#3F6583 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) | #586584 | 0.032 |
| Deuteranopia (no green cones) | #4F5E82 | 0.027 |
| Tritanopia (no blue cones) | #1C6C6F | 0.054 |
| Achromatopsia (no color) | #616161 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6583
#3F6583
oklch(49.1% 0.065 243.5)
- #7B5939
#7B5939
oklch(49.2% 0.065 63.7)
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 #3F6583, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.018
- Slate #516572 ΔE 0.034
- YInMn Blue #415A77 ΔE 0.034
- Dusky Blue #475F94 ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.043
- Peacock Blue #016795 ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.044
- Dusty Grape #545775 ΔE 0.046
Use #3F6583 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.