#3581DF
Closest named color: Dark Sky Blue (#448EE4). oklch(60.4% 0.161 255.6), rgb(53, 129, 223).
Aa
Black text reads best on this color (5.35:1).
About this color
#3581DF is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.161 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.039 away. Black text reads best on it, at 5.35:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.161) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.35:1 |
| White text | 3.92:1 |
Values
| HEX | #3581DF |
| RGB | rgb(53, 129, 223) |
| HSL | hsl(213, 73%, 54%) |
| OKLCH | oklch(60.4% 0.161 255.6) |
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 #3581DF | 3.92:1 | AA large text | Lc -71.7 | Content text, not long reading |
| Black text on #3581DF | 5.35:1 | AA | Lc 37.9 | Non-text elements, placeholder text |
| #3581DF text on white | 3.92:1 | AA large text | Lc 66.2 | Content text, not long reading |
| #3581DF text on black | 5.35:1 | AA | Lc -35.5 | 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 500.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#9FC3F3
oklch(80.8% 0.079 255.7)
-
Step 400
400
#69A3EE
oklch(70.7% 0.126 255.4)
-
Step 500
500 (this color)
#3581DF
oklch(60.4% 0.161 255.6)
-
Step 600
600
#1671D6
oklch(55.6% 0.175 255.5)
-
Step 700
700
#045EBA
oklch(49.1% 0.163 255.6)
-
Step 800
800
#0B4D96
oklch(42.6% 0.135 255.5)
-
Step 900
900
#144178
oklch(37.7% 0.106 255.7)
-
Step 950
950
#0D2746
oklch(27.1% 0.066 254.6)
#3581DF 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) | #5289E3 | 0.035 |
| Deuteranopia (no green cones) | #3479DD | 0.021 |
| Tritanopia (no blue cones) | #0097A5 | 0.123 |
| Achromatopsia (no color) | #818181 | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3581DF
#3581DF
oklch(60.4% 0.161 255.6)
- #AC7500
#AC7500
oklch(60.4% 0.127 76.1)
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 #3581DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.039
- Water Blue #0E87CC ΔE 0.040
- Windows Blue #3778BF ΔE 0.051
- Clear Blue #247AFD ΔE 0.052
- Soft Blue #6488EA ΔE 0.053
- Dodger Blue #1E90FF ΔE 0.057
- Chefchaouen Blue #4895EF ΔE 0.060
- Royal Blue #4169E1 ΔE 0.061
Use #3581DF 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.