#588DDD
Closest named color: Dark Sky Blue (#448EE4). oklch(64.3% 0.133 258.4), rgb(88, 141, 221).
Aa
Black text reads best on this color (6.26:1).
About this color
#588DDD is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.133 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.019 away. Black text reads best on it, at 6.26:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.26:1 |
| White text | 3.34:1 |
Values
| HEX | #588DDD |
| RGB | rgb(88, 141, 221) |
| HSL | hsl(216, 66%, 61%) |
| OKLCH | oklch(64.3% 0.133 258.4) |
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 #588DDD | 3.34:1 | AA large text | Lc -66.2 | Content text, not long reading |
| Black text on #588DDD | 6.26:1 | AA | Lc 43.3 | Non-text elements, placeholder text |
| #588DDD text on white | 3.34:1 | AA large text | Lc 60.7 | Content text, not long reading |
| #588DDD text on black | 6.26:1 | AA | Lc -41.0 | 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
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A7C2EB
oklch(80.8% 0.065 258.6)
-
Step 400
400
#78A2E1
oklch(70.7% 0.104 258.3)
-
Step 500
500 (this color)
#588DDD
oklch(64.3% 0.133 258.4)
-
Step 600
600
#3972C7
oklch(55.7% 0.145 258.4)
-
Step 700
700
#2B5FAC
oklch(49.2% 0.135 258.3)
-
Step 800
800
#254E8B
oklch(42.8% 0.111 258.3)
-
Step 900
900
#23416F
oklch(37.7% 0.087 258.7)
-
Step 950
950
#152641
oklch(26.9% 0.056 259.3)
#588DDD 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) | #6B93E0 | 0.028 |
| Deuteranopia (no green cones) | #5987DB | 0.016 |
| Tritanopia (no blue cones) | #009FAA | 0.114 |
| Achromatopsia (no color) | #8C8C8C | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #588DDD
#588DDD
oklch(64.3% 0.133 258.4)
- #B88102
#B88102
oklch(64.2% 0.133 78.5)
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 #588DDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.019
- Soft Blue #6488EA ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.032
- Cornflower Blue #6495ED ΔE 0.034
- Faded Blue #658CBB ΔE 0.052
- Water Blue #0E87CC ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.059
- Cool Blue #4984B8 ΔE 0.061
Use #588DDD 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.