#588BDB
Closest named color: Dark Sky Blue (#448EE4). oklch(63.7% 0.133 259.1), rgb(88, 139, 219).
Aa
Black text reads best on this color (6.13:1).
About this color
#588BDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.133 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.021 away. Black text reads best on it, at 6.13:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.13:1 |
| White text | 3.42:1 |
Values
| HEX | #588BDB |
| RGB | rgb(88, 139, 219) |
| HSL | hsl(217, 65%, 60%) |
| OKLCH | oklch(63.7% 0.133 259.1) |
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 #588BDB | 3.42:1 | AA large text | Lc -67.0 | Content text, not long reading |
| Black text on #588BDB | 6.13:1 | AA | Lc 42.5 | Non-text elements, placeholder text |
| #588BDB text on white | 3.42:1 | AA large text | Lc 61.6 | Content text, not long reading |
| #588BDB text on black | 6.13:1 | AA | Lc -40.1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A8C2EB
oklch(80.9% 0.065 259.4)
-
Step 400
400
#79A2E1
oklch(70.8% 0.103 258.8)
-
Step 500
500 (this color)
#588BDB
oklch(63.7% 0.133 259.1)
-
Step 600
600
#3B71C6
oklch(55.5% 0.144 259.2)
-
Step 700
700
#2D5EAB
oklch(49% 0.134 259.2)
-
Step 800
800
#264D8B
oklch(42.6% 0.112 259.3)
-
Step 900
900
#24416F
oklch(37.7% 0.087 259.3)
-
Step 950
950
#152641
oklch(26.9% 0.056 259.3)
#588BDB 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) | #6991DE | 0.026 |
| Deuteranopia (no green cones) | #5885D9 | 0.016 |
| Tritanopia (no blue cones) | #009DA9 | 0.113 |
| Achromatopsia (no color) | #8B8B8B | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #588BDB
#588BDB
oklch(63.7% 0.133 259.1)
- #B68000
#B68000
oklch(63.8% 0.132 78.9)
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 #588BDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.021
- Soft Blue #6488EA ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.036
- Cornflower Blue #6495ED ΔE 0.039
- Faded Blue #658CBB ΔE 0.051
- Water Blue #0E87CC ΔE 0.055
- Cool Blue #4984B8 ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.061
Use #588BDB 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.