#3F6499
Closest named color: Dusky Blue (#475F94). oklch(50% 0.095 257.4), rgb(63, 100, 153).
Aa
White text reads best on this color (6.00:1).
About this color
#3F6499 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.095 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.016 away. White text reads best on it, at 6.00:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.49:1 |
| White text | 6.00:1 |
Values
| HEX | #3F6499 |
| RGB | rgb(63, 100, 153) |
| HSL | hsl(215, 42%, 42%) |
| OKLCH | oklch(50% 0.095 257.4) |
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 #3F6499 | 6.00:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #3F6499 | 3.49:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #3F6499 text on white | 6.00:1 | AA | Lc 79.9 | Fine for body text |
| #3F6499 text on black | 3.49:1 | AA large text | Lc -21.9 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CFDAEA
oklch(88.5% 0.025 257.6)
-
Step 300
300
#AEC2DF
oklch(80.8% 0.047 257.6)
-
Step 400
400
#84A2CF
oklch(70.6% 0.074 258.3)
-
Step 500
500
#658BC2
oklch(63.1% 0.094 257.6)
-
Step 600
600
#4B74AF
oklch(55.6% 0.103 257.5)
-
Step 700
700 (this color)
#3F6499
oklch(50% 0.095 257.4)
-
Step 800
800
#32507A
oklch(42.8% 0.079 257)
-
Step 900
900
#2C4262
oklch(37.6% 0.062 257.7)
-
Step 950
950
#1A2739
oklch(27% 0.038 256.7)
#3F6499 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) | #4E689B | 0.023 |
| Deuteranopia (no green cones) | #435F98 | 0.014 |
| Tritanopia (no blue cones) | #007077 | 0.084 |
| Achromatopsia (no color) | #636363 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6499
#3F6499
oklch(50% 0.095 257.4)
- #815B16
#815B16
oklch(49.9% 0.095 77.2)
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 #3F6499, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.016
- Denim #3B638C ΔE 0.022
- Denim Blue #3B5B92 ΔE 0.028
- French Blue #436BAD ΔE 0.035
- Muted Blue #3B719F ΔE 0.037
- Peacock Blue #016795 ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.043
- Mid Blue #276AB3 ΔE 0.044
Use #3F6499 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.