#3663B7
Closest named color: Mid Blue (#276AB3). oklch(51.3% 0.142 261.6), rgb(54, 99, 183).
Aa
White text reads best on this color (5.79:1).
About this color
#3663B7 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.142 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.023 away. White text reads best on it, at 5.79:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.62:1 |
| White text | 5.79:1 |
Values
| HEX | #3663B7 |
| RGB | rgb(54, 99, 183) |
| HSL | hsl(219, 54%, 46%) |
| OKLCH | oklch(51.3% 0.142 261.6) |
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 #3663B7 | 5.79:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #3663B7 | 3.62:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #3663B7 text on white | 5.79:1 | AA | Lc 78.7 | Fine for body text |
| #3663B7 text on black | 3.62:1 | AA large text | Lc -23.1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CBDAF3
oklch(88.5% 0.038 260.7)
-
Step 300
300
#A8C2EE
oklch(81% 0.069 260.9)
-
Step 400
400
#7AA0E5
oklch(70.6% 0.11 261.8)
-
Step 500
500
#5887DE
oklch(63% 0.141 261.7)
-
Step 600
600
#3E6FCB
oklch(55.5% 0.152 261.7)
-
Step 700
700 (this color)
#3663B7
oklch(51.3% 0.142 261.6)
-
Step 800
800
#284C8E
oklch(42.7% 0.117 261.4)
-
Step 900
900
#254072
oklch(37.7% 0.092 261.6)
-
Step 950
950
#162643
oklch(27.1% 0.058 261.5)
#3663B7 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) | #386CBA | 0.025 |
| Deuteranopia (no green cones) | #1E60B5 | 0.022 |
| Tritanopia (no blue cones) | #007784 | 0.115 |
| Achromatopsia (no color) | #656565 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3663B7
#3663B7
oklch(51.3% 0.142 261.6)
- #855F00
#855F00
oklch(51.2% 0.106 81.3)
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 #3663B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.023
- French Blue #436BAD ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.056
- Dusky Blue #475F94 ΔE 0.056
- Windows Blue #3778BF ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.060
- Muted Blue #3B719F ΔE 0.061
- Iris #6258C4 ΔE 0.063
Use #3663B7 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.