#5580BB
Closest named color: Cool Blue (#4984B8). oklch(59.4% 0.103 256.5), rgb(85, 128, 187).
Aa
Black text reads best on this color (5.19:1).
About this color
#5580BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.103 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.017 away. Black text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #5580BB |
| RGB | rgb(85, 128, 187) |
| HSL | hsl(215, 43%, 53%) |
| OKLCH | oklch(59.4% 0.103 256.5) |
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 #5580BB | 4.04:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #5580BB | 5.19:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #5580BB text on white | 4.04:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #5580BB text on black | 5.19:1 | AA | Lc -34.1 | 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
#ACC2E1
oklch(80.8% 0.05 257)
-
Step 400
400
#80A3D3
oklch(70.8% 0.081 256.4)
-
Step 500
500 (this color)
#5580BB
oklch(59.4% 0.103 256.5)
-
Step 600
600
#4674B4
oklch(55.6% 0.112 256.9)
-
Step 700
700
#37619B
oklch(49.1% 0.105 256.8)
-
Step 800
800
#2E507D
oklch(42.8% 0.085 256)
-
Step 900
900
#294265
oklch(37.6% 0.068 257)
-
Step 950
950
#18273B
oklch(27% 0.043 255.9)
#5580BB 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) | #6884BE | 0.027 |
| Deuteranopia (no green cones) | #5C7ABA | 0.017 |
| Tritanopia (no blue cones) | #178D95 | 0.091 |
| Achromatopsia (no color) | #7E7E7E | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5580BB
#5580BB
oklch(59.4% 0.103 256.5)
- #A1762E
#A1762E
oklch(59.5% 0.103 77.1)
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 #5580BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.017
- Steel Blue #4682B4 ΔE 0.020
- Off Blue #5684AE ΔE 0.026
- Dusty Blue #5A86AD ΔE 0.032
- Windows Blue #3778BF ΔE 0.040
- Faded Blue #658CBB ΔE 0.041
- Water Blue #0E87CC ΔE 0.048
- Stormy Blue #507B9C ΔE 0.049
Use #5580BB 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.