#3F657E
Closest named color: Denim (#3B638C). oklch(48.9% 0.059 238.5), rgb(63, 101, 126).
Aa
White text reads best on this color (6.22:1).
About this color
#3F657E is a medium-dark, muted blue. In OKLCH its lightness is 49%, its chroma 0.059 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.026 away. White text reads best on it, at 6.22:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.37:1 |
| White text | 6.22:1 |
Values
| HEX | #3F657E |
| RGB | rgb(63, 101, 126) |
| HSL | hsl(204, 33%, 37%) |
| OKLCH | oklch(48.9% 0.059 238.5) |
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 #3F657E | 6.22:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #3F657E | 3.37:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #3F657E text on white | 6.22:1 | AA | Lc 80.9 | Fine for body text |
| #3F657E text on black | 3.37:1 | AA large text | Lc -20.9 | 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
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D0DBE3
oklch(88.5% 0.016 239.1)
-
Step 300
300
#B0C4D1
oklch(80.9% 0.029 236.3)
-
Step 400
400
#87A5BA
oklch(70.7% 0.045 238.8)
-
Step 500
500
#688FA9
oklch(63.1% 0.058 238.1)
-
Step 600
600
#4F7995
oklch(55.7% 0.064 238.6)
-
Step 700
700 (this color)
#3F657E
oklch(48.9% 0.059 238.5)
-
Step 800
800
#355367
oklch(42.7% 0.049 238.6)
-
Step 900
900
#2E4554
oklch(37.8% 0.038 237.7)
-
Step 950
950
#1B2831
oklch(26.9% 0.025 239.1)
#3F657E 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) | #5A647F | 0.035 |
| Deuteranopia (no green cones) | #515E7E | 0.029 |
| Tritanopia (no blue cones) | #216B6D | 0.047 |
| Achromatopsia (no color) | #616161 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F657E
#3F657E
oklch(48.9% 0.059 238.5)
- #7A583E
#7A583E
oklch(49% 0.059 58.2)
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 #3F657E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.026
- Slate #516572 ΔE 0.028
- YInMn Blue #415A77 ΔE 0.032
- Dusty Grape #545775 ΔE 0.045
- Dusky Blue #475F94 ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.046
- Peacock Blue #016795 ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.050
Use #3F657E 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.