#588BB1
Closest named color: Dusty Blue (#5A86AD). oklch(61.6% 0.08 241.9), rgb(88, 139, 177).
Aa
Black text reads best on this color (5.74:1).
About this color
#588BB1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.080 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Blue (#5A86AD), ΔE 0.014 away. Black text reads best on it, at 5.74:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Dusty Blue (#5A86AD) |
| Black text | 5.74:1 |
| White text | 3.65:1 |
Values
| HEX | #588BB1 |
| RGB | rgb(88, 139, 177) |
| HSL | hsl(206, 36%, 52%) |
| OKLCH | oklch(61.6% 0.08 241.9) |
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 #588BB1 | 3.65:1 | AA large text | Lc -69.5 | Content text, not long reading |
| Black text on #588BB1 | 5.74:1 | AA | Lc 40.0 | Non-text elements, placeholder text |
| #588BB1 text on white | 3.65:1 | AA large text | Lc 64.0 | Content text, not long reading |
| #588BB1 text on black | 5.74:1 | AA | Lc -37.6 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CDDBE6
oklch(88.4% 0.021 241.4)
-
Step 300
300
#ABC4D8
oklch(80.8% 0.039 242.2)
-
Step 400
400
#7EA6C5
oklch(70.7% 0.063 242)
-
Step 500
500 (this color)
#588BB1
oklch(61.6% 0.08 241.9)
-
Step 600
600
#4179A2
oklch(55.6% 0.087 242.3)
-
Step 700
700
#33668A
oklch(49.1% 0.08 241.6)
-
Step 800
800
#2B5370
oklch(42.6% 0.066 242)
-
Step 900
900
#27455B
oklch(37.7% 0.052 241.8)
-
Step 950
950
#172835
oklch(26.8% 0.033 242.4)
#588BB1 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) | #7B8BB3 | 0.042 |
| Deuteranopia (no green cones) | #6F82B0 | 0.034 |
| Tritanopia (no blue cones) | #2B9498 | 0.064 |
| Achromatopsia (no color) | #868686 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #588BB1
#588BB1
oklch(61.6% 0.08 241.9)
- #A87A52
#A87A52
oklch(61.6% 0.08 61.5)
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 #588BB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Blue #5A86AD ΔE 0.014
- Off Blue #5684AE ΔE 0.020
- Faded Blue #658CBB ΔE 0.022
- Cool Blue #4984B8 ΔE 0.030
- Steel Blue #4682B4 ΔE 0.035
- Silver Lake Blue #778DA9 ΔE 0.039
- Blue Grey #758DA3 ΔE 0.040
- Blue NCS #118AB2 ΔE 0.046
Use #588BB1 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.