#3665C3
Closest named color: Mid Blue (#276AB3). oklch(52.5% 0.156 262.4), rgb(54, 101, 195).
Aa
White text reads best on this color (5.51:1).
About this color
#3665C3 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.156 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.032 away. White text reads best on it, at 5.51:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.80:1 |
| White text | 5.51:1 |
Values
| HEX | #3665C3 |
| RGB | rgb(54, 101, 195) |
| HSL | hsl(220, 57%, 49%) |
| OKLCH | oklch(52.5% 0.156 262.4) |
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 #3665C3 | 5.51:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #3665C3 | 3.80:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #3665C3 text on white | 5.51:1 | AA | Lc 77.2 | Fine for body text |
| #3665C3 text on black | 3.80:1 | AA large text | Lc -24.6 | 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 600.
-
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
#CBDAF4
oklch(88.5% 0.039 261.5)
-
Step 300
300
#A8C1EF
oklch(80.8% 0.071 262.5)
-
Step 400
400
#7AA0E7
oklch(70.7% 0.113 262.3)
-
Step 500
500
#5987E0
oklch(63.2% 0.144 262.4)
-
Step 600
600 (this color)
#3665C3
oklch(52.5% 0.156 262.4)
-
Step 700
700
#315CB2
oklch(49.2% 0.145 262.4)
-
Step 800
800
#294B90
oklch(42.6% 0.121 262.7)
-
Step 900
900
#254073
oklch(37.8% 0.093 261.9)
-
Step 950
950
#162643
oklch(27.1% 0.058 261.5)
#3665C3 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) | #3170C6 | 0.029 |
| Deuteranopia (no green cones) | #0463C1 | 0.029 |
| Tritanopia (no blue cones) | #007B8A | 0.125 |
| Achromatopsia (no color) | #696969 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3665C3
#3665C3
oklch(52.5% 0.156 262.4)
- #896300
#896300
oklch(52.5% 0.108 82.2)
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 #3665C3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.032
- French Blue #436BAD ΔE 0.043
- Royal Blue #4169E1 ΔE 0.049
- Windows Blue #3778BF ΔE 0.054
- Warm Blue #4B57DB ΔE 0.055
- Iris #6258C4 ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.063
- Flat Blue #3C73A8 ΔE 0.063
Use #3665C3 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.