#599FD4
Closest named color: Cornflower Blue (#6495ED). oklch(67.8% 0.106 243.1), rgb(89, 159, 212).
Aa
Black text reads best on this color (7.33:1).
About this color
#599FD4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.106 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.053 away. Black text reads best on it, at 7.33:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.33:1 |
| White text | 2.86:1 |
Values
| HEX | #599FD4 |
| RGB | rgb(89, 159, 212) |
| HSL | hsl(206, 59%, 59%) |
| OKLCH | oklch(67.8% 0.106 243.1) |
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 #599FD4 | 2.86:1 | Fails | Lc -59.9 | Large or bold text, headings |
| Black text on #599FD4 | 7.33:1 | AAA | Lc 49.4 | Large or bold text, headings |
| #599FD4 text on white | 2.86:1 | Fails | Lc 54.6 | Large or bold text, headings |
| #599FD4 text on black | 7.33:1 | AAA | Lc -47.2 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C5DDF0
oklch(88.6% 0.037 241.8)
-
Step 300
300
#9CC6E9
oklch(80.9% 0.067 243.9)
-
Step 400
400 (this color)
#599FD4
oklch(67.8% 0.106 243.1)
-
Step 500
500
#2C91D4
oklch(63.1% 0.135 243)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900
#05466C
oklch(37.8% 0.087 242.4)
-
Step 950
950
#08293F
oklch(27% 0.055 242.5)
#599FD4 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) | #88A0D6 | 0.052 |
| Deuteranopia (no green cones) | #7793D3 | 0.042 |
| Tritanopia (no blue cones) | #00ACB1 | 0.084 |
| Achromatopsia (no color) | #999999 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599FD4
#599FD4
oklch(67.8% 0.106 243.1)
- #C6894E
#C6894E
oklch(67.9% 0.106 63.4)
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 #599FD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.053
- Greyblue #77A1B5 ΔE 0.055
- Faded Blue #658CBB ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.062
- Turquoise Blue #06B1C4 ΔE 0.071
- Bluegrey #85A3B2 ΔE 0.071
- Silver Lake Blue #778DA9 ΔE 0.072
Use #599FD4 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.