#3664B0
Closest named color: Mid Blue (#276AB3). oklch(51% 0.131 259.9), rgb(54, 100, 176).
Aa
White text reads best on this color (5.82:1).
About this color
#3664B0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.131 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.018 away. White text reads best on it, at 5.82:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.60:1 |
| White text | 5.82:1 |
Values
| HEX | #3664B0 |
| RGB | rgb(54, 100, 176) |
| HSL | hsl(217, 53%, 45%) |
| OKLCH | oklch(51% 0.131 259.9) |
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 #3664B0 | 5.82:1 | AA | Lc -84.1 | Fine for body text |
| Black text on #3664B0 | 3.60:1 | AA large text | Lc 25.2 | Dividers and decoration only |
| #3664B0 text on white | 5.82:1 | AA | Lc 78.8 | Fine for body text |
| #3664B0 text on black | 3.60:1 | AA large text | Lc -23.0 | 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
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CCDAF1
oklch(88.5% 0.035 260.4)
-
Step 300
300
#A9C2EA
oklch(80.9% 0.063 259.7)
-
Step 400
400
#7BA1E0
oklch(70.6% 0.102 260.2)
-
Step 500
500
#5989D7
oklch(63.1% 0.129 259.7)
-
Step 600
600
#3F71C5
oklch(55.6% 0.142 260.1)
-
Step 700
700 (this color)
#3664B0
oklch(51% 0.131 259.9)
-
Step 800
800
#294D8A
oklch(42.6% 0.11 260.3)
-
Step 900
900
#25416E
oklch(37.7% 0.085 259.5)
-
Step 950
950
#162640
oklch(26.9% 0.053 259.7)
#3664B0 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) | #406BB3 | 0.023 |
| Deuteranopia (no green cones) | #2B60AE | 0.016 |
| Tritanopia (no blue cones) | #007681 | 0.106 |
| Achromatopsia (no color) | #656565 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3664B0
#3664B0
oklch(51% 0.131 259.9)
- #855E00
#855E00
oklch(51% 0.105 80.3)
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 #3664B0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.018
- French Blue #436BAD ΔE 0.026
- Dusky Blue #475F94 ΔE 0.046
- Flat Blue #3C73A8 ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.050
- Muted Blue #3B719F ΔE 0.051
- Peacock Blue #016795 ΔE 0.056
- Windows Blue #3778BF ΔE 0.057
Use #3664B0 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.