#587BC4
Closest named color: Windows Blue (#3778BF). oklch(59% 0.119 263.7), rgb(88, 123, 196).
Aa
Black text reads best on this color (5.04:1).
About this color
#587BC4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.119 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.036 away. Black text reads best on it, at 5.04:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.04:1 |
| White text | 4.16:1 |
Values
| HEX | #587BC4 |
| RGB | rgb(88, 123, 196) |
| HSL | hsl(221, 48%, 56%) |
| OKLCH | oklch(59% 0.119 263.7) |
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 #587BC4 | 4.16:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #587BC4 | 5.04:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #587BC4 text on white | 4.16:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #587BC4 text on black | 5.04:1 | AA | Lc -33.2 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#CFD9EE
oklch(88.4% 0.031 265.3)
-
Step 300
300
#AFC1E4
oklch(80.9% 0.053 263.7)
-
Step 400
400
#85A0D7
oklch(70.6% 0.087 264.1)
-
Step 500
500
#6788CC
oklch(63.1% 0.11 263.8)
-
Step 600
600 (this color)
#587BC4
oklch(59% 0.119 263.7)
-
Step 700
700
#3F5E9F
oklch(49% 0.111 263.6)
-
Step 800
800
#344D81
oklch(42.6% 0.092 263.6)
-
Step 900
900
#2E4168
oklch(37.9% 0.071 263.6)
-
Step 950
950
#1B263D
oklch(27% 0.046 264.1)
#587BC4 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) | #5D82C7 | 0.021 |
| Deuteranopia (no green cones) | #5078C2 | 0.013 |
| Tritanopia (no blue cones) | #178B96 | 0.107 |
| Achromatopsia (no color) | #7C7C7C | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #587BC4
#587BC4
oklch(59% 0.119 263.7)
- #9F7607
#9F7607
oklch(59.1% 0.12 83.8)
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 #587BC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- Cool Blue #4984B8 ΔE 0.037
- Steel Blue #4682B4 ΔE 0.039
- Off Blue #5684AE ΔE 0.048
- Water Blue #0E87CC ΔE 0.052
- Dusty Blue #5A86AD ΔE 0.053
- Faded Blue #658CBB ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.058
Use #587BC4 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.