#3F576A
Closest named color: YInMn Blue (#415A77). oklch(44.5% 0.043 242.7), rgb(63, 87, 106).
Aa
White text reads best on this color (7.54:1).
About this color
#3F576A is a dark, muted blue. In OKLCH its lightness is 45%, its chroma 0.043 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.022 away. White text reads best on it, at 7.54:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #3F576A |
| RGB | rgb(63, 87, 106) |
| HSL | hsl(207, 25%, 33%) |
| OKLCH | oklch(44.5% 0.043 242.7) |
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 #3F576A | 7.54:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #3F576A | 2.78:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #3F576A text on white | 7.54:1 | AAA | Lc 86.2 | Fine for body text |
| #3F576A text on black | 2.78:1 | Fails | Lc -15.9 | 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 800.
-
Step 50
50
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EAEE
oklch(93.5% 0.007 247.9)
-
Step 200
200
#D2DAE2
oklch(88.5% 0.014 248)
-
Step 300
300
#B3C3D0
oklch(80.9% 0.025 242.4)
-
Step 400
400
#8CA4B8
oklch(70.7% 0.04 243.5)
-
Step 500
500
#6F8EA6
oklch(63.2% 0.05 241.8)
-
Step 600
600
#567892
oklch(55.7% 0.056 241.9)
-
Step 700
700
#46647C
oklch(49% 0.052 243.2)
-
Step 800
800 (this color)
#3F576A
oklch(44.5% 0.043 242.7)
-
Step 900
900
#324452
oklch(37.7% 0.033 242.1)
-
Step 950
950
#1D2830
oklch(27% 0.021 240.1)
#3F576A 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) | #4F576B | 0.023 |
| Deuteranopia (no green cones) | #49526A | 0.020 |
| Tritanopia (no blue cones) | #305C5D | 0.036 |
| Achromatopsia (no color) | #545454 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F576A
#3F576A
oklch(44.5% 0.043 242.7)
- #654F3B
#654F3B
oklch(44.5% 0.043 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 #3F576A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.022
- Dusty Grape #545775 ΔE 0.036
- Petrol #005F6A ΔE 0.048
- Dusk #4E5481 ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.050
- Slate #516572 ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.053
- Denim #3B638C ΔE 0.058
Use #3F576A 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.