#3663C1
Closest named color: Mid Blue (#276AB3). oklch(51.9% 0.156 262.9), rgb(54, 99, 193).
Aa
White text reads best on this color (5.65:1).
About this color
#3663C1 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.156 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.033 away. White text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #3663C1 |
| RGB | rgb(54, 99, 193) |
| HSL | hsl(221, 56%, 48%) |
| OKLCH | oklch(51.9% 0.156 262.9) |
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 #3663C1 | 5.65:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #3663C1 | 3.71:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #3663C1 text on white | 5.65:1 | AA | Lc 77.9 | Fine for body text |
| #3663C1 text on black | 3.71:1 | AA large text | Lc -23.9 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF6
oklch(88.6% 0.042 263)
-
Step 300
300
#A7C1F2
oklch(80.9% 0.075 262.9)
-
Step 400
400
#789FEC
oklch(70.6% 0.121 263.1)
-
Step 500
500
#5686E6
oklch(63.2% 0.154 262.8)
-
Step 600
600
#3C6DD4
oklch(55.6% 0.168 263)
-
Step 700
700 (this color)
#3663C1
oklch(51.9% 0.156 262.9)
-
Step 800
800
#274A94
oklch(42.6% 0.129 263)
-
Step 900
900
#243F76
oklch(37.7% 0.1 262.9)
-
Step 950
950
#152545
oklch(26.9% 0.064 262.8)
#3663C1 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) | #2E6EC4 | 0.029 |
| Deuteranopia (no green cones) | #0061BF | 0.030 |
| Tritanopia (no blue cones) | #007989 | 0.123 |
| Achromatopsia (no color) | #676767 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3663C1
#3663C1
oklch(51.9% 0.156 262.9)
- #866200
#866200
oklch(51.9% 0.107 83.4)
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 #3663C1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.033
- French Blue #436BAD ΔE 0.044
- Royal Blue #4169E1 ΔE 0.053
- Warm Blue #4B57DB ΔE 0.055
- Iris #6258C4 ΔE 0.058
- Windows Blue #3778BF ΔE 0.058
- Dark Periwinkle #665FD1 ΔE 0.065
- Flat Blue #3C73A8 ΔE 0.065
Use #3663C1 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.