#588BB9
Closest named color: Faded Blue (#658CBB). oklch(62% 0.089 247), rgb(88, 139, 185).
Aa
Black text reads best on this color (5.80:1).
About this color
#588BB9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.089 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.015 away. Black text reads best on it, at 5.80:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 5.80:1 |
| White text | 3.61:1 |
Values
| HEX | #588BB9 |
| RGB | rgb(88, 139, 185) |
| HSL | hsl(208, 41%, 54%) |
| OKLCH | oklch(62% 0.089 247) |
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 #588BB9 | 3.61:1 | AA large text | Lc -69.1 | Content text, not long reading |
| Black text on #588BB9 | 5.80:1 | AA | Lc 40.5 | Non-text elements, placeholder text |
| #588BB9 text on white | 3.61:1 | AA large text | Lc 63.6 | Content text, not long reading |
| #588BB9 text on black | 5.80:1 | 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
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CDDBE9
oklch(88.5% 0.025 248.1)
-
Step 300
300
#ABC4DC
oklch(80.9% 0.044 247.3)
-
Step 400
400
#7DA5CA
oklch(70.6% 0.07 246.9)
-
Step 500
500 (this color)
#588BB9
oklch(62% 0.089 247)
-
Step 600
600
#4078A9
oklch(55.6% 0.097 247)
-
Step 700
700
#326591
oklch(49.2% 0.09 246.9)
-
Step 800
800
#2A5276
oklch(42.7% 0.075 247.7)
-
Step 900
900
#27445F
oklch(37.7% 0.058 248)
-
Step 950
950
#172838
oklch(27% 0.038 247.9)
#588BB9 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) | #788CBB | 0.039 |
| Deuteranopia (no green cones) | #6B82B8 | 0.031 |
| Tritanopia (no blue cones) | #22969B | 0.075 |
| Achromatopsia (no color) | #878787 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #588BB9
#588BB9
oklch(62% 0.089 247)
- #AA7B49
#AA7B49
oklch(61.9% 0.089 66.6)
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 #588BB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.015
- Dusty Blue #5A86AD ΔE 0.020
- Off Blue #5684AE ΔE 0.023
- Cool Blue #4984B8 ΔE 0.027
- Steel Blue #4682B4 ΔE 0.034
- Silver Lake Blue #778DA9 ΔE 0.044
- Blue Grey #758DA3 ΔE 0.048
- Blue NCS #118AB2 ΔE 0.049
Use #588BB9 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.