#587FBC
Closest named color: Cool Blue (#4984B8). oklch(59.4% 0.104 259.1), rgb(88, 127, 188).
Aa
Black text reads best on this color (5.17:1).
About this color
#587FBC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.104 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.022 away. Black text reads best on it, at 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.17:1 |
| White text | 4.05:1 |
Values
| HEX | #587FBC |
| RGB | rgb(88, 127, 188) |
| HSL | hsl(217, 43%, 54%) |
| OKLCH | oklch(59.4% 0.104 259.1) |
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 #587FBC | 4.05:1 | AA large text | Lc -73.2 | Content text, not long reading |
| Black text on #587FBC | 5.17:1 | AA | Lc 36.4 | Non-text elements, placeholder text |
| #587FBC text on white | 4.05:1 | AA large text | Lc 67.7 | Content text, not long reading |
| #587FBC text on black | 5.17:1 | AA | Lc -34.0 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#ADC2E2
oklch(80.9% 0.051 258.7)
-
Step 400
400
#82A2D3
oklch(70.7% 0.081 258.7)
-
Step 500
500 (this color)
#587FBC
oklch(59.4% 0.104 259.1)
-
Step 600
600
#4973B5
oklch(55.6% 0.113 259.1)
-
Step 700
700
#3B609C
oklch(49.1% 0.106 259.6)
-
Step 800
800
#314F7E
oklch(42.8% 0.086 259.1)
-
Step 900
900
#2B4265
oklch(37.7% 0.067 258.5)
-
Step 950
950
#19273B
oklch(27% 0.042 257.3)
#587FBC 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) | #6783BF | 0.023 |
| Deuteranopia (no green cones) | #5B7ABB | 0.014 |
| Tritanopia (no blue cones) | #228C95 | 0.092 |
| Achromatopsia (no color) | #7E7E7E | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #587FBC
#587FBC
oklch(59.4% 0.104 259.1)
- #9F762C
#9F762C
oklch(59.3% 0.103 78.9)
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 #587FBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.022
- Steel Blue #4682B4 ΔE 0.025
- Off Blue #5684AE ΔE 0.029
- Dusty Blue #5A86AD ΔE 0.035
- Windows Blue #3778BF ΔE 0.041
- Faded Blue #658CBB ΔE 0.042
- Water Blue #0E87CC ΔE 0.050
- Stormy Blue #507B9C ΔE 0.051
Use #587FBC 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.