#3F6399
Closest named color: Dusky Blue (#475F94). oklch(49.8% 0.096 258.3), rgb(63, 99, 153).
Aa
White text reads best on this color (6.07:1).
About this color
#3F6399 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.096 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.014 away. White text reads best on it, at 6.07:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.45:1 |
| White text | 6.07:1 |
Values
| HEX | #3F6399 |
| RGB | rgb(63, 99, 153) |
| HSL | hsl(216, 42%, 42%) |
| OKLCH | oklch(49.8% 0.096 258.3) |
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 #3F6399 | 6.07:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #3F6399 | 3.45:1 | AA large text | Lc 23.9 | Dividers and decoration only |
| #3F6399 text on white | 6.07:1 | AA | Lc 80.2 | Fine for body text |
| #3F6399 text on black | 3.45:1 | AA large text | Lc -21.6 | 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
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AFC2DF
oklch(80.9% 0.046 258.8)
-
Step 400
400
#84A2CF
oklch(70.6% 0.074 258.3)
-
Step 500
500
#658BC3
oklch(63.2% 0.095 257.9)
-
Step 600
600
#4C74AF
oklch(55.6% 0.103 258)
-
Step 700
700 (this color)
#3F6399
oklch(49.8% 0.096 258.3)
-
Step 800
800
#334F7A
oklch(42.6% 0.08 258.7)
-
Step 900
900
#2D4262
oklch(37.7% 0.061 258.6)
-
Step 950
950
#1A273A
oklch(27% 0.04 257.8)
#3F6399 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) | #4D679B | 0.022 |
| Deuteranopia (no green cones) | #415E98 | 0.014 |
| Tritanopia (no blue cones) | #006F77 | 0.084 |
| Achromatopsia (no color) | #626262 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6399
#3F6399
oklch(49.8% 0.096 258.3)
- #805B13
#805B13
oklch(49.8% 0.096 78.6)
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 #3F6399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.014
- Denim #3B638C ΔE 0.022
- Denim Blue #3B5B92 ΔE 0.025
- French Blue #436BAD ΔE 0.037
- Peacock Blue #016795 ΔE 0.039
- Muted Blue #3B719F ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.042
- Mid Blue #276AB3 ΔE 0.044
Use #3F6399 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.