#587CCB
Closest named color: Windows Blue (#3778BF). oklch(59.6% 0.128 264.4), rgb(88, 124, 203).
Aa
Black text reads best on this color (5.16:1).
About this color
#587CCB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.128 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.041 away. Black text reads best on it, at 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #587CCB |
| RGB | rgb(88, 124, 203) |
| HSL | hsl(221, 53%, 57%) |
| OKLCH | oklch(59.6% 0.128 264.4) |
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 #587CCB | 4.06:1 | AA large text | Lc -73.2 | Content text, not long reading |
| Black text on #587CCB | 5.16:1 | AA | Lc 36.4 | Non-text elements, placeholder text |
| #587CCB text on white | 4.06:1 | AA large text | Lc 67.7 | Content text, not long reading |
| #587CCB text on black | 5.16:1 | AA | Lc -33.9 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#ADC1EA
oklch(81% 0.062 264.6)
-
Step 400
400
#81A0E0
oklch(70.8% 0.1 264.1)
-
Step 500
500 (this color)
#587CCB
oklch(59.6% 0.128 264.4)
-
Step 600
600
#496FC4
oklch(55.6% 0.139 264.2)
-
Step 700
700
#3B5CA9
oklch(49% 0.129 264.6)
-
Step 800
800
#314C89
oklch(42.8% 0.106 264.4)
-
Step 900
900
#2B406E
oklch(37.8% 0.083 264.3)
-
Step 950
950
#192640
oklch(27.1% 0.052 263.2)
#587CCB 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) | #5B84CE | 0.022 |
| Deuteranopia (no green cones) | #4C79C9 | 0.017 |
| Tritanopia (no blue cones) | #018D9A | 0.114 |
| Achromatopsia (no color) | #7E7E7E | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #587CCB
#587CCB
oklch(59.6% 0.128 264.4)
- #A17800
#A17800
oklch(59.7% 0.122 84.6)
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 #587CCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.041
- Cool Blue #4984B8 ΔE 0.043
- Steel Blue #4682B4 ΔE 0.047
- Water Blue #0E87CC ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.055
- Off Blue #5684AE ΔE 0.055
- Soft Blue #6488EA ΔE 0.056
- Faded Blue #658CBB ΔE 0.059
Use #587CCB 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.