#587ECB
Closest named color: Cool Blue (#4984B8). oklch(60% 0.126 263.2), rgb(88, 126, 203).
Aa
Black text reads best on this color (5.26:1).
About this color
#587ECB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.126 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.040 away. Black text reads best on it, at 5.26:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.26:1 |
| White text | 3.99:1 |
Values
| HEX | #587ECB |
| RGB | rgb(88, 126, 203) |
| HSL | hsl(220, 53%, 57%) |
| OKLCH | oklch(60% 0.126 263.2) |
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 #587ECB | 3.99:1 | AA large text | Lc -72.6 | Content text, not long reading |
| Black text on #587ECB | 5.26:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #587ECB text on white | 3.99:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #587ECB text on black | 5.26:1 | AA | Lc -34.6 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#ACC1E9
oklch(80.9% 0.061 263.2)
-
Step 400
400
#80A0DE
oklch(70.6% 0.098 263.1)
-
Step 500
500 (this color)
#587ECB
oklch(60% 0.126 263.2)
-
Step 600
600
#4870C2
oklch(55.6% 0.135 263.1)
-
Step 700
700
#395DA8
oklch(49.1% 0.127 263.2)
-
Step 800
800
#304C88
oklch(42.6% 0.105 263.7)
-
Step 900
900
#2A406D
oklch(37.7% 0.082 263.3)
-
Step 950
950
#192640
oklch(27.1% 0.052 263.2)
#587ECB 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) | #5E85CE | 0.021 |
| Deuteranopia (no green cones) | #507AC9 | 0.015 |
| Tritanopia (no blue cones) | #008F9B | 0.112 |
| Achromatopsia (no color) | #7F7F7F | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #587ECB
#587ECB
oklch(60% 0.126 263.2)
- #A47800
#A47800
oklch(60.1% 0.124 82.8)
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 #587ECB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.040
- Windows Blue #3778BF ΔE 0.042
- Steel Blue #4682B4 ΔE 0.045
- Water Blue #0E87CC ΔE 0.050
- Dark Sky Blue #448EE4 ΔE 0.051
- Off Blue #5684AE ΔE 0.052
- Soft Blue #6488EA ΔE 0.054
- Faded Blue #658CBB ΔE 0.054
Use #587ECB 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.