#3F617B
Closest named color: YInMn Blue (#415A77). oklch(47.8% 0.058 242.4), rgb(63, 97, 123).
Aa
White text reads best on this color (6.54:1).
About this color
#3F617B is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.058 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.021 away. White text reads best on it, at 6.54:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 3.20:1 |
| White text | 6.54:1 |
Values
| HEX | #3F617B |
| RGB | rgb(63, 97, 123) |
| HSL | hsl(206, 32%, 36%) |
| OKLCH | oklch(47.8% 0.058 242.4) |
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 #3F617B | 6.54:1 | AA | Lc -87.4 | Fine for body text |
| Black text on #3F617B | 3.20:1 | AA large text | Lc 21.7 | Dividers and decoration only |
| #3F617B text on white | 6.54:1 | AA | Lc 82.4 | Fine for body text |
| #3F617B text on black | 3.20:1 | AA large text | Lc -19.5 | 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
#D1DBE3
oklch(88.6% 0.015 241.8)
-
Step 300
300
#B2C3D2
oklch(80.9% 0.028 244.8)
-
Step 400
400
#89A5BB
oklch(70.8% 0.045 242)
-
Step 500
500
#6B8EAA
oklch(63.1% 0.058 242.9)
-
Step 600
600
#527895
oklch(55.6% 0.062 242.1)
-
Step 700
700 (this color)
#3F617B
oklch(47.8% 0.058 242.4)
-
Step 800
800
#375267
oklch(42.6% 0.048 242.6)
-
Step 900
900
#304454
oklch(37.7% 0.037 243.1)
-
Step 950
950
#1C2831
oklch(27% 0.024 241.1)
#3F617B 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) | #56617C | 0.030 |
| Deuteranopia (no green cones) | #4E5B7B | 0.025 |
| Tritanopia (no blue cones) | #24676A | 0.046 |
| Achromatopsia (no color) | #5D5D5D | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F617B
#3F617B
oklch(47.8% 0.058 242.4)
- #75563A
#75563A
oklch(47.9% 0.058 62.8)
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 #3F617B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.021
- Denim #3B638C ΔE 0.027
- Slate #516572 ΔE 0.032
- Dusty Grape #545775 ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.039
- Dusky Blue #475F94 ΔE 0.045
- Dusk #4E5481 ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.046
Use #3F617B 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.