#588CB4
Closest named color: Dusty Blue (#5A86AD). oklch(62% 0.082 242.8), rgb(88, 140, 180).
Aa
Black text reads best on this color (5.82:1).
About this color
#588CB4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.082 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Blue (#5A86AD), ΔE 0.018 away. Black text reads best on it, at 5.82:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Dusty Blue (#5A86AD) |
| Black text | 5.82:1 |
| White text | 3.60:1 |
Values
| HEX | #588CB4 |
| RGB | rgb(88, 140, 180) |
| HSL | hsl(206, 38%, 53%) |
| OKLCH | oklch(62% 0.082 242.8) |
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 #588CB4 | 3.60:1 | AA large text | Lc -69.0 | Content text, not long reading |
| Black text on #588CB4 | 5.82:1 | AA | Lc 40.5 | Non-text elements, placeholder text |
| #588CB4 text on white | 3.60:1 | AA large text | Lc 63.5 | Content text, not long reading |
| #588CB4 text on black | 5.82:1 | AA | Lc -38.1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CDDBE7
oklch(88.4% 0.022 243.8)
-
Step 300
300
#ABC4D9
oklch(80.8% 0.04 243.6)
-
Step 400
400
#7DA6C6
oklch(70.7% 0.065 242.3)
-
Step 500
500 (this color)
#588CB4
oklch(62% 0.082 242.8)
-
Step 600
600
#4079A4
oklch(55.6% 0.09 243.2)
-
Step 700
700
#31668C
oklch(49.1% 0.083 242.3)
-
Step 800
800
#2A5372
oklch(42.7% 0.069 243.3)
-
Step 900
900
#27455C
oklch(37.8% 0.053 243)
-
Step 950
950
#172836
oklch(26.9% 0.035 244.4)
#588CB4 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) | #7B8CB6 | 0.042 |
| Deuteranopia (no green cones) | #6F83B3 | 0.034 |
| Tritanopia (no blue cones) | #289699 | 0.069 |
| Achromatopsia (no color) | #878787 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #588CB4
#588CB4
oklch(62% 0.082 242.8)
- #AA7B50
#AA7B50
oklch(62% 0.083 62.8)
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 #588CB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Blue #5A86AD ΔE 0.018
- Faded Blue #658CBB ΔE 0.019
- Off Blue #5684AE ΔE 0.023
- Cool Blue #4984B8 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.036
- Silver Lake Blue #778DA9 ΔE 0.039
- Blue Grey #758DA3 ΔE 0.042
- Blue NCS #118AB2 ΔE 0.047
Use #588CB4 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.