#588CD4
Closest named color: Dark Sky Blue (#448EE4). oklch(63.6% 0.123 256.8), rgb(88, 140, 212).
Aa
Black text reads best on this color (6.11:1).
About this color
#588CD4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.123 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.028 away. Black text reads best on it, at 6.11:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.11:1 |
| White text | 3.43:1 |
Values
| HEX | #588CD4 |
| RGB | rgb(88, 140, 212) |
| HSL | hsl(215, 59%, 59%) |
| OKLCH | oklch(63.6% 0.123 256.8) |
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 #588CD4 | 3.43:1 | AA large text | Lc -67.1 | Content text, not long reading |
| Black text on #588CD4 | 6.11:1 | AA | Lc 42.4 | Non-text elements, placeholder text |
| #588CD4 text on white | 3.43:1 | AA large text | Lc 61.7 | Content text, not long reading |
| #588CD4 text on black | 6.11:1 | AA | Lc -40.0 | 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
#E3EBF6
oklch(93.7% 0.017 256.3)
-
Step 200
200
#CBDAF0
oklch(88.4% 0.034 257.9)
-
Step 300
300
#A8C3E8
oklch(81% 0.06 256.3)
-
Step 400
400
#7AA3DC
oklch(70.8% 0.095 256.7)
-
Step 500
500 (this color)
#588CD4
oklch(63.6% 0.123 256.8)
-
Step 600
600
#3B73C0
oklch(55.6% 0.134 256.9)
-
Step 700
700
#2D60A5
oklch(49% 0.124 256.8)
-
Step 800
800
#264F86
oklch(42.7% 0.103 256.5)
-
Step 900
900
#24426B
oklch(37.7% 0.079 256.6)
-
Step 950
950
#16273F
oklch(27.1% 0.05 257.1)
#588CD4 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) | #6E91D7 | 0.030 |
| Deuteranopia (no green cones) | #5E85D3 | 0.019 |
| Tritanopia (no blue cones) | #009CA6 | 0.105 |
| Achromatopsia (no color) | #8A8A8A | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #588CD4
#588CD4
oklch(63.6% 0.123 256.8)
- #B48020
#B48020
oklch(63.6% 0.123 77.3)
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 #588CD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.028
- Soft Blue #6488EA ΔE 0.040
- Faded Blue #658CBB ΔE 0.040
- Chefchaouen Blue #4895EF ΔE 0.043
- Cornflower Blue #6495ED ΔE 0.044
- Cool Blue #4984B8 ΔE 0.049
- Water Blue #0E87CC ΔE 0.052
- Steel Blue #4682B4 ΔE 0.057
Use #588CD4 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.