#3584C8
Closest named color: Water Blue (#0E87CC). oklch(59.7% 0.129 248), rgb(53, 132, 200).
Aa
Black text reads best on this color (5.28:1).
About this color
#3584C8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.129 and its hue 248°. 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 5.28:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.28:1 |
| White text | 3.97:1 |
Values
| HEX | #3584C8 |
| RGB | rgb(53, 132, 200) |
| HSL | hsl(208, 58%, 50%) |
| OKLCH | oklch(59.7% 0.129 248) |
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 #3584C8 | 3.97:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #3584C8 | 5.28:1 | AA | Lc 37.3 | Non-text elements, placeholder text |
| #3584C8 text on white | 3.97:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #3584C8 text on black | 5.28:1 | AA | Lc -34.9 | 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
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A1C5E8
oklch(80.9% 0.063 247.9)
-
Step 400
400
#6CA6DD
oklch(70.7% 0.101 248.2)
-
Step 500
500 (this color)
#3584C8
oklch(59.7% 0.129 248)
-
Step 600
600
#1877C1
oklch(55.6% 0.141 248.4)
-
Step 700
700
#0464A6
oklch(49.1% 0.13 247.9)
-
Step 800
800
#0D5287
oklch(42.8% 0.108 248.1)
-
Step 900
900
#15446C
oklch(37.7% 0.085 248.2)
-
Step 950
950
#0E283F
oklch(26.9% 0.054 248)
#3584C8 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) | #6587CB | 0.048 |
| Deuteranopia (no green cones) | #5079C7 | 0.035 |
| Tritanopia (no blue cones) | #00949D | 0.094 |
| Achromatopsia (no color) | #808080 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3584C8
#3584C8
oklch(59.7% 0.129 248)
- #B16E07
#B16E07
oklch(59.7% 0.129 67.9)
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 #3584C8, 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 0.028
- Steel Blue #4682B4 ΔE 0.031
- Windows Blue #3778BF ΔE 0.034
- Blue NCS #118AB2 ΔE 0.045
- Off Blue #5684AE ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.050
- Nice Blue #107AB0 ΔE 0.050
Use #3584C8 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.