#3584CB
Closest named color: Water Blue (#0E87CC). oklch(59.9% 0.133 249), rgb(53, 132, 203).
Aa
Black text reads best on this color (5.31:1).
About this color
#3584CB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.133 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.017 away. Black text reads best on it, at 5.31:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.31:1 |
| White text | 3.95:1 |
Values
| HEX | #3584CB |
| RGB | rgb(53, 132, 203) |
| HSL | hsl(208, 59%, 50%) |
| OKLCH | oklch(59.9% 0.133 249) |
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 #3584CB | 3.95:1 | AA large text | Lc -72.0 | Content text, not long reading |
| Black text on #3584CB | 5.31:1 | AA | Lc 37.5 | Non-text elements, placeholder text |
| #3584CB text on white | 3.95:1 | AA large text | Lc 66.5 | Content text, not long reading |
| #3584CB text on black | 5.31:1 | AA | Lc -35.1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C7DCF1
oklch(88.5% 0.037 248.2)
-
Step 300
300
#A1C5E9
oklch(81% 0.064 248.6)
-
Step 400
400
#6BA6DF
oklch(70.8% 0.104 248.7)
-
Step 500
500 (this color)
#3584CB
oklch(59.9% 0.133 249)
-
Step 600
600
#1777C3
oklch(55.7% 0.144 248.9)
-
Step 700
700
#0363A9
oklch(49.1% 0.135 249.4)
-
Step 800
800
#0C5188
oklch(42.6% 0.111 249.1)
-
Step 900
900
#15446D
oklch(37.7% 0.086 248.8)
-
Step 950
950
#0E2840
oklch(27% 0.055 249)
#3584CB 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) | #6388CE | 0.046 |
| Deuteranopia (no green cones) | #4E7ACA | 0.031 |
| Tritanopia (no blue cones) | #00959E | 0.098 |
| Achromatopsia (no color) | #808080 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3584CB
#3584CB
oklch(59.9% 0.133 249)
- #B16F00
#B16F00
oklch(59.9% 0.13 69.1)
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 #3584CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.017
- Cool Blue #4984B8 ΔE 0.032
- Windows Blue #3778BF ΔE 0.035
- Steel Blue #4682B4 ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.046
- Blue NCS #118AB2 ΔE 0.050
- Off Blue #5684AE ΔE 0.051
- Nice Blue #107AB0 ΔE 0.053
Use #3584CB 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.