#588BF9
Closest named color: Soft Blue (#6488EA). oklch(65.5% 0.173 263.6), rgb(88, 139, 249).
Aa
Black text reads best on this color (6.47:1).
About this color
#588BF9 is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.173 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.024 away. Black text reads best on it, at 6.47:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.47:1 |
| White text | 3.24:1 |
Values
| HEX | #588BF9 |
| RGB | rgb(88, 139, 249) |
| HSL | hsl(221, 93%, 66%) |
| OKLCH | oklch(65.5% 0.173 263.6) |
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 #588BF9 | 3.24:1 | AA large text | Lc -64.8 | Content text, not long reading |
| Black text on #588BF9 | 6.47:1 | AA | Lc 44.7 | Non-text elements, placeholder text |
| #588BF9 text on white | 3.24:1 | AA large text | Lc 59.4 | Large or bold text, headings |
| #588BF9 text on black | 6.47:1 | AA | Lc -42.3 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A5C1F8
oklch(81% 0.084 263.6)
-
Step 400
400
#749EF5
oklch(70.6% 0.136 263.7)
-
Step 500
500 (this color)
#588BF9
oklch(65.5% 0.173 263.6)
-
Step 600
600
#366ADF
oklch(55.6% 0.187 263.5)
-
Step 700
700
#2957C2
oklch(49% 0.175 263.6)
-
Step 800
800
#23489D
oklch(42.7% 0.145 263.7)
-
Step 900
900
#213D7D
oklch(37.6% 0.114 264)
-
Step 950
950
#142449
oklch(26.9% 0.072 264.5)
#588BF9 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) | #5697FD | 0.030 |
| Deuteranopia (no green cones) | #3A88F7 | 0.028 |
| Tritanopia (no blue cones) | #00A4B6 | 0.142 |
| Achromatopsia (no color) | #8F8F8F | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #588BF9
#588BF9
oklch(65.5% 0.173 263.6)
- #B88800
#B88800
oklch(65.6% 0.135 83.5)
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 #588BF9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.024
- Chefchaouen Blue #4895EF ΔE 0.034
- Dodger Blue #1E90FF ΔE 0.037
- Cornflower Blue #6495ED ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.039
- Cornflower #6A79F7 ΔE 0.046
- Lavender Blue #8B88F8 ΔE 0.061
- Clear Blue #247AFD ΔE 0.064
Use #588BF9 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.