#587CB5
Closest named color: Steel Blue (#4682B4). oklch(58.4% 0.097 259.3), rgb(88, 124, 181).
Aa
Black text reads best on this color (4.96:1).
About this color
#587CB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.097 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.024 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #587CB5 |
| RGB | rgb(88, 124, 181) |
| HSL | hsl(217, 39%, 53%) |
| OKLCH | oklch(58.4% 0.097 259.3) |
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 #587CB5 | 4.22:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #587CB5 | 4.96:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #587CB5 text on white | 4.22:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #587CB5 text on black | 4.96:1 | AA | Lc -32.6 | 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 600.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D0DAEA
oklch(88.6% 0.025 259.8)
-
Step 300
300
#B0C2DD
oklch(80.9% 0.043 258.4)
-
Step 400
400
#87A2CD
oklch(70.8% 0.07 259.6)
-
Step 500
500
#698AC0
oklch(63.1% 0.09 260)
-
Step 600
600 (this color)
#587CB5
oklch(58.4% 0.097 259.3)
-
Step 700
700
#416194
oklch(49.2% 0.091 259.4)
-
Step 800
800
#364F78
oklch(42.7% 0.075 259.9)
-
Step 900
900
#2F4261
oklch(37.8% 0.059 259.9)
-
Step 950
950
#1B2739
oklch(27.1% 0.038 258.3)
#587CB5 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) | #6680B7 | 0.022 |
| Deuteranopia (no green cones) | #5B77B4 | 0.014 |
| Tritanopia (no blue cones) | #2B8890 | 0.086 |
| Achromatopsia (no color) | #7B7B7B | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #587CB5
#587CB5
oklch(58.4% 0.097 259.3)
- #9A7430
#9A7430
oklch(58.3% 0.097 79.2)
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 #587CB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.024
- Cool Blue #4984B8 ΔE 0.025
- Off Blue #5684AE ΔE 0.028
- Dusty Blue #5A86AD ΔE 0.035
- Windows Blue #3778BF ΔE 0.039
- Stormy Blue #507B9C ΔE 0.041
- Cerulean #457B9D ΔE 0.045
- Flat Blue #3C73A8 ΔE 0.045
Use #587CB5 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.