#3661B4
Closest named color: Mid Blue (#276AB3). oklch(50.6% 0.14 262), rgb(54, 97, 180).
Aa
White text reads best on this color (5.95:1).
About this color
#3661B4 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.140 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.026 away. White text reads best on it, at 5.95:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.52:1 |
| White text | 5.95:1 |
Values
| HEX | #3661B4 |
| RGB | rgb(54, 97, 180) |
| HSL | hsl(220, 54%, 46%) |
| OKLCH | oklch(50.6% 0.14 262) |
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 #3661B4 | 5.95:1 | AA | Lc -84.7 | Fine for body text |
| Black text on #3661B4 | 3.52:1 | AA large text | Lc 24.6 | Dividers and decoration only |
| #3661B4 text on white | 5.95:1 | AA | Lc 79.5 | Fine for body text |
| #3661B4 text on black | 3.52:1 | AA large text | Lc -22.4 | 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
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C1ED
oklch(80.8% 0.068 262.5)
-
Step 400
400
#7BA0E4
oklch(70.6% 0.108 262.1)
-
Step 500
500
#5A87DD
oklch(63.1% 0.139 262.3)
-
Step 600
600
#406FCA
oklch(55.6% 0.15 262.1)
-
Step 700
700 (this color)
#3661B4
oklch(50.6% 0.14 262)
-
Step 800
800
#2A4C8E
oklch(42.7% 0.116 262.1)
-
Step 900
900
#264071
oklch(37.7% 0.09 261.9)
-
Step 950
950
#172642
oklch(27.1% 0.056 262)
#3661B4 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) | #376AB7 | 0.025 |
| Deuteranopia (no green cones) | #1D5EB2 | 0.023 |
| Tritanopia (no blue cones) | #007482 | 0.112 |
| Achromatopsia (no color) | #646464 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3661B4
#3661B4
oklch(50.6% 0.14 262)
- #825E00
#825E00
oklch(50.6% 0.104 82.4)
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 #3661B4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.026
- French Blue #436BAD ΔE 0.036
- Dusky Blue #475F94 ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.054
- Flat Blue #3C73A8 ΔE 0.059
- Muted Blue #3B719F ΔE 0.062
- Peacock Blue #016795 ΔE 0.064
- Windows Blue #3778BF ΔE 0.064
Use #3661B4 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.