#599EE9
Closest named color: Cornflower Blue (#6495ED). oklch(68.7% 0.132 252), rgb(89, 158, 233).
Aa
Black text reads best on this color (7.49:1).
About this color
#599EE9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.132 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.027 away. Black text reads best on it, at 7.49:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.49:1 |
| White text | 2.80:1 |
Values
| HEX | #599EE9 |
| RGB | rgb(89, 158, 233) |
| HSL | hsl(211, 77%, 63%) |
| OKLCH | oklch(68.7% 0.132 252) |
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 #599EE9 | 2.80:1 | Fails | Lc -59.0 | Large or bold text, headings |
| Black text on #599EE9 | 7.49:1 | AAA | Lc 50.3 | Large or bold text, headings |
| #599EE9 text on white | 2.80:1 | Fails | Lc 53.7 | Large or bold text, headings |
| #599EE9 text on black | 7.49:1 | AAA | Lc -48.1 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF7
oklch(88.5% 0.045 251.4)
-
Step 300
300
#9AC5F5
oklch(81% 0.082 251.6)
-
Step 400
400 (this color)
#599EE9
oklch(68.7% 0.132 252)
-
Step 500
500
#298BEB
oklch(63% 0.169 252.2)
-
Step 600
600
#0074D0
oklch(55.6% 0.166 251.9)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#044279
oklch(37.7% 0.11 252)
-
Step 950
950
#072747
oklch(26.9% 0.07 252)
#599EE9 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) | #7EA2EC | 0.042 |
| Deuteranopia (no green cones) | #6A94E7 | 0.029 |
| Tritanopia (no blue cones) | #00AFB9 | 0.106 |
| Achromatopsia (no color) | #9A9A9A | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599EE9
#599EE9
oklch(68.7% 0.132 252)
- #CC8B2B
#CC8B2B
oklch(68.6% 0.132 71.9)
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 #599EE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.027
- Chefchaouen Blue #4895EF ΔE 0.033
- Dark Sky Blue #448EE4 ΔE 0.050
- Soft Blue #6488EA ΔE 0.059
- Dodger Blue #1E90FF ΔE 0.068
- Periwinkle Blue #8F99FB ΔE 0.069
- Perrywinkle #8F8CE7 ΔE 0.073
- Faded Blue #658CBB ΔE 0.074
Use #599EE9 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.