#3F497D
Closest named color: Twilight (#4E518B). oklch(42.2% 0.087 273.9), rgb(63, 73, 125).
Aa
White text reads best on this color (8.53:1).
About this color
#3F497D is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.087 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.039 away. White text reads best on it, at 8.53:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.46:1 |
| White text | 8.53:1 |
Values
| HEX | #3F497D |
| RGB | rgb(63, 73, 125) |
| HSL | hsl(230, 33%, 37%) |
| OKLCH | oklch(42.2% 0.087 273.9) |
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 #3F497D | 8.53:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #3F497D | 2.46:1 | Fails | Lc 14.7 | Not readable |
| #3F497D text on white | 8.53:1 | AAA | Lc 89.3 | Fine for body text |
| #3F497D text on black | 2.46:1 | Fails | Lc -13.0 | Not readable |
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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F4
oklch(93.5% 0.015 273.8)
-
Step 200
200
#D3D8EC
oklch(88.4% 0.028 274.6)
-
Step 300
300
#B6BFE2
oklch(80.9% 0.05 273.9)
-
Step 400
400
#909DD4
oklch(70.6% 0.082 273.9)
-
Step 500
500
#7684C9
oklch(63.1% 0.105 274.3)
-
Step 600
600
#5F6DB5
oklch(55.6% 0.113 273.9)
-
Step 700
700
#4E5B9C
oklch(49.1% 0.105 273.4)
-
Step 800
800 (this color)
#3F497D
oklch(42.2% 0.087 273.9)
-
Step 900
900
#363E66
oklch(37.6% 0.069 274)
-
Step 950
950
#20253B
oklch(27.1% 0.042 273.5)
#3F497D 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) | #354F7F | 0.020 |
| Deuteranopia (no green cones) | #2F4A7C | 0.021 |
| Tritanopia (no blue cones) | #27545D | 0.077 |
| Achromatopsia (no color) | #4C4C4C | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F497D
#3F497D
oklch(42.2% 0.087 273.9)
- #5D4C00
#5D4C00
oklch(42.2% 0.086 94.1)
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 #3F497D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.039
- Dusk #4E5481 ΔE 0.041
- Dusk Blue #26538D ΔE 0.041
- Light Navy #155084 ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.044
- Cobalt #1E488F ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.050
- Blueberry #464196 ΔE 0.050
Use #3F497D 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.