#3F68AB
Closest named color: French Blue (#436BAD). oklch(52% 0.116 259.8), rgb(63, 104, 171).
Aa
White text reads best on this color (5.55:1).
About this color
#3F68AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.116 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.010 away. White text reads best on it, at 5.55:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.77:1 |
| White text | 5.55:1 |
Values
| HEX | #3F68AB |
| RGB | rgb(63, 104, 171) |
| HSL | hsl(217, 46%, 46%) |
| OKLCH | oklch(52% 0.116 259.8) |
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 #3F68AB | 5.55:1 | AA | Lc -82.9 | Fine for body text |
| Black text on #3F68AB | 3.77:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #3F68AB text on white | 5.55:1 | AA | Lc 77.6 | Fine for body text |
| #3F68AB text on black | 3.77:1 | AA large text | Lc -24.2 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ACC2E6
oklch(81% 0.056 260.2)
-
Step 400
400
#7FA2D9
oklch(70.8% 0.09 259.2)
-
Step 500
500
#5F8ACF
oklch(63.2% 0.115 259.5)
-
Step 600
600
#4572BC
oklch(55.6% 0.126 259.8)
-
Step 700
700 (this color)
#3F68AB
oklch(52% 0.116 259.8)
-
Step 800
800
#2E4E83
oklch(42.7% 0.096 260)
-
Step 900
900
#294169
oklch(37.6% 0.075 260.1)
-
Step 950
950
#18263D
oklch(26.8% 0.047 260)
#3F68AB 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) | #4B6EAE | 0.023 |
| Deuteranopia (no green cones) | #3C64AA | 0.012 |
| Tritanopia (no blue cones) | #007781 | 0.097 |
| Achromatopsia (no color) | #686868 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F68AB
#3F68AB
oklch(52% 0.116 259.8)
- #896000
#896000
oklch(51.9% 0.108 79.5)
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 #3F68AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.010
- Mid Blue #276AB3 ΔE 0.022
- Flat Blue #3C73A8 ΔE 0.033
- Muted Blue #3B719F ΔE 0.036
- Dusky Blue #475F94 ΔE 0.040
- Windows Blue #3778BF ΔE 0.049
- Denim #3B638C ΔE 0.050
- Denim Blue #3B5B92 ΔE 0.050
Use #3F68AB 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.