#3F618B
Closest named color: Denim (#3B638C). oklch(48.6% 0.079 254.4), rgb(63, 97, 139).
Aa
White text reads best on this color (6.37:1).
About this color
#3F618B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.079 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.007 away. White text reads best on it, at 6.37:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.29:1 |
| White text | 6.37:1 |
Values
| HEX | #3F618B |
| RGB | rgb(63, 97, 139) |
| HSL | hsl(213, 38%, 40%) |
| OKLCH | oklch(48.6% 0.079 254.4) |
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 #3F618B | 6.37:1 | AA | Lc -86.7 | Fine for body text |
| Black text on #3F618B | 3.29:1 | AA large text | Lc 22.5 | Dividers and decoration only |
| #3F618B text on white | 6.37:1 | AA | Lc 81.6 | Fine for body text |
| #3F618B text on black | 3.29:1 | AA large text | Lc -20.3 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE7
oklch(88.5% 0.021 254.9)
-
Step 300
300
#B0C2D9
oklch(80.8% 0.038 254.6)
-
Step 400
400
#87A3C7
oklch(70.7% 0.062 254.9)
-
Step 500
500
#698CB8
oklch(63.1% 0.078 254.5)
-
Step 600
600
#5075A4
oklch(55.5% 0.085 254.9)
-
Step 700
700 (this color)
#3F618B
oklch(48.6% 0.079 254.4)
-
Step 800
800
#355172
oklch(42.8% 0.065 253.3)
-
Step 900
900
#2F435C
oklch(37.7% 0.05 254.4)
-
Step 950
950
#1B2736
oklch(26.9% 0.033 254.4)
#3F618B 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) | #50638D | 0.023 |
| Deuteranopia (no green cones) | #475C8A | 0.016 |
| Tritanopia (no blue cones) | #146A70 | 0.068 |
| Achromatopsia (no color) | #5F5F5F | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F618B
#3F618B
oklch(48.6% 0.079 254.4)
- #7A5827
#7A5827
oklch(48.6% 0.079 73.9)
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 #3F618B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.007
- Dusky Blue #475F94 ΔE 0.020
- Denim Blue #3B5B92 ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.030
- YInMn Blue #415A77 ΔE 0.034
- Peacock Blue #016795 ΔE 0.039
- Dusk #4E5481 ΔE 0.040
- Dusty Grape #545775 ΔE 0.045
Use #3F618B 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.