#3660BB
Closest named color: Mid Blue (#276AB3). oklch(50.9% 0.151 263.4), rgb(54, 96, 187).
Aa
White text reads best on this color (5.91:1).
About this color
#3660BB is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.151 and its hue 263°. 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 5.91:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.54:1 |
| White text | 5.91:1 |
Values
| HEX | #3660BB |
| RGB | rgb(54, 96, 187) |
| HSL | hsl(221, 55%, 47%) |
| OKLCH | oklch(50.9% 0.151 263.4) |
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 #3660BB | 5.91:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #3660BB | 3.54:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #3660BB text on white | 5.91:1 | AA | Lc 79.2 | Fine for body text |
| #3660BB text on black | 3.54:1 | AA large text | Lc -22.6 | 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 700.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A8C1F1
oklch(80.9% 0.074 263.3)
-
Step 400
400
#7A9FEA
oklch(70.6% 0.118 263.6)
-
Step 500
500
#5986E3
oklch(63.2% 0.149 263.3)
-
Step 600
600
#3F6DD1
oklch(55.6% 0.163 263.5)
-
Step 700
700 (this color)
#3660BB
oklch(50.9% 0.151 263.4)
-
Step 800
800
#294B93
oklch(42.8% 0.125 263.1)
-
Step 900
900
#253F75
oklch(37.7% 0.098 263.2)
-
Step 950
950
#162544
oklch(26.9% 0.061 263.4)
#3660BB 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) | #2E6ABE | 0.026 |
| Deuteranopia (no green cones) | #035EB9 | 0.031 |
| Tritanopia (no blue cones) | #007584 | 0.121 |
| Achromatopsia (no color) | #646464 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3660BB
#3660BB
oklch(50.9% 0.151 263.4)
- #825F00
#825F00
oklch(50.8% 0.104 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 #3660BB, 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 0.044
- Iris #6258C4 ΔE 0.059
- Warm Blue #4B57DB ΔE 0.060
- Dusky Blue #475F94 ΔE 0.064
- Royal Blue #4169E1 ΔE 0.064
- Denim Blue #3B5B92 ΔE 0.065
- Windows Blue #3778BF ΔE 0.066
Use #3660BB 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.