#588FC9
Closest named color: Faded Blue (#658CBB). oklch(63.7% 0.106 251), rgb(88, 143, 201).
Aa
Black text reads best on this color (6.18:1).
About this color
#588FC9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.106 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.023 away. Black text reads best on it, at 6.18:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.18:1 |
| White text | 3.39:1 |
Values
| HEX | #588FC9 |
| RGB | rgb(88, 143, 201) |
| HSL | hsl(211, 51%, 57%) |
| OKLCH | oklch(63.7% 0.106 251) |
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 #588FC9 | 3.39:1 | AA large text | Lc -66.7 | Content text, not long reading |
| Black text on #588FC9 | 6.18:1 | AA | Lc 42.8 | Non-text elements, placeholder text |
| #588FC9 text on white | 3.39:1 | AA large text | Lc 61.3 | Content text, not long reading |
| #588FC9 text on black | 6.18:1 | AA | Lc -40.4 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBEC
oklch(88.5% 0.029 251.5)
-
Step 300
300
#A9C4E2
oklch(81% 0.052 251.2)
-
Step 400
400
#7AA5D3
oklch(70.8% 0.082 250.7)
-
Step 500
500 (this color)
#588FC9
oklch(63.7% 0.106 251)
-
Step 600
600
#3A76B4
oklch(55.5% 0.115 251.3)
-
Step 700
700
#2C639B
oklch(49.1% 0.107 251.3)
-
Step 800
800
#26517D
oklch(42.6% 0.088 251.1)
-
Step 900
900
#244465
oklch(37.8% 0.068 250.7)
-
Step 950
950
#15283B
oklch(27.1% 0.044 249.7)
#588FC9 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) | #7791CC | 0.037 |
| Deuteranopia (no green cones) | #6886C8 | 0.028 |
| Tritanopia (no blue cones) | #009CA3 | 0.091 |
| Achromatopsia (no color) | #8B8B8B | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #588FC9
#588FC9
oklch(63.7% 0.106 251)
- #B37F3C
#B37F3C
oklch(63.6% 0.105 70.7)
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 #588FC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.023
- Cool Blue #4984B8 ΔE 0.041
- Dusty Blue #5A86AD ΔE 0.044
- Dark Sky Blue #448EE4 ΔE 0.044
- Off Blue #5684AE ΔE 0.046
- Steel Blue #4682B4 ΔE 0.050
- Water Blue #0E87CC ΔE 0.055
- Chefchaouen Blue #4895EF ΔE 0.056
Use #588FC9 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.