#587BCF
Closest named color: Windows Blue (#3778BF). oklch(59.6% 0.135 265.5), rgb(88, 123, 207).
Aa
Black text reads best on this color (5.14:1).
About this color
#587BCF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.135 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.043 away. Black text reads best on it, at 5.14:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.14:1 |
| White text | 4.07:1 |
Values
| HEX | #587BCF |
| RGB | rgb(88, 123, 207) |
| HSL | hsl(222, 55%, 58%) |
| OKLCH | oklch(59.6% 0.135 265.5) |
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 #587BCF | 4.07:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #587BCF | 5.14:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #587BCF text on white | 4.07:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #587BCF text on black | 5.14:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#ACC0EC
oklch(80.8% 0.066 265.8)
-
Step 400
400
#819FE3
oklch(70.7% 0.106 265.6)
-
Step 500
500 (this color)
#587BCF
oklch(59.6% 0.135 265.5)
-
Step 600
600
#496EC8
oklch(55.6% 0.146 265.2)
-
Step 700
700
#3B5BAD
oklch(49.1% 0.136 265.6)
-
Step 800
800
#314B8C
oklch(42.7% 0.112 265.5)
-
Step 900
900
#2B3F70
oklch(37.7% 0.088 265.7)
-
Step 950
950
#192542
oklch(27% 0.057 265.8)
#587BCF 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) | #5783D2 | 0.021 |
| Deuteranopia (no green cones) | #4879CD | 0.019 |
| Tritanopia (no blue cones) | #008E9B | 0.120 |
| Achromatopsia (no color) | #7E7E7E | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #587BCF
#587BCF
oklch(59.6% 0.135 265.5)
- #A07800
#A07800
oklch(59.6% 0.122 85.2)
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 #587BCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.043
- Cool Blue #4984B8 ΔE 0.050
- Soft Blue #6488EA ΔE 0.053
- Steel Blue #4682B4 ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.054
- Water Blue #0E87CC ΔE 0.055
- Off Blue #5684AE ΔE 0.062
- Royal Blue #4169E1 ΔE 0.065
Use #587BCF 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.