#3679DA
Closest named color: Windows Blue (#3778BF). oklch(58.4% 0.163 258.1), rgb(54, 121, 218).
Aa
Black text reads best on this color (4.90:1).
About this color
#3679DA is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.163 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.042 away. Black text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.90:1 |
| White text | 4.28:1 |
Values
| HEX | #3679DA |
| RGB | rgb(54, 121, 218) |
| HSL | hsl(215, 69%, 53%) |
| OKLCH | oklch(58.4% 0.163 258.1) |
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 #3679DA | 4.28:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #3679DA | 4.90:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #3679DA text on white | 4.28:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #3679DA text on black | 4.90:1 | AA | Lc -32.5 | Non-text elements, placeholder text |
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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF5
oklch(88.6% 0.041 257.5)
-
Step 300
300
#A4C3F0
oklch(81% 0.072 257.6)
-
Step 400
400
#72A2E9
oklch(70.7% 0.117 258)
-
Step 500
500
#4C89E3
oklch(63.2% 0.15 258.1)
-
Step 600
600 (this color)
#3679DA
oklch(58.4% 0.163 258.1)
-
Step 700
700
#205EB5
oklch(49.2% 0.152 258)
-
Step 800
800
#1C4D92
oklch(42.7% 0.125 257.8)
-
Step 900
900
#1D4175
oklch(37.8% 0.098 257.9)
-
Step 950
950
#122644
oklch(26.9% 0.062 258.3)
#3679DA 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) | #4782DE | 0.030 |
| Deuteranopia (no green cones) | #2573D8 | 0.021 |
| Tritanopia (no blue cones) | #00909F | 0.127 |
| Achromatopsia (no color) | #7A7A7A | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3679DA
#3679DA
oklch(58.4% 0.163 258.1)
- #A27100
#A27100
oklch(58.4% 0.122 78.5)
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 #3679DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.042
- Royal Blue #4169E1 ΔE 0.043
- Water Blue #0E87CC ΔE 0.049
- Cerulean Blue #056EEE ΔE 0.050
- Clear Blue #247AFD ΔE 0.053
- Dark Sky Blue #448EE4 ΔE 0.060
- Soft Blue #6488EA ΔE 0.068
- Neon Blue #4361EE ΔE 0.068
Use #3679DA 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.