#599FDB
Closest named color: Cornflower Blue (#6495ED). oklch(68.2% 0.114 246.3), rgb(89, 159, 219).
Aa
Black text reads best on this color (7.40:1).
About this color
#599FDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.114 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.044 away. Black text reads best on it, at 7.40:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.40:1 |
| White text | 2.83:1 |
Values
| HEX | #599FDB |
| RGB | rgb(89, 159, 219) |
| HSL | hsl(208, 64%, 60%) |
| OKLCH | oklch(68.2% 0.114 246.3) |
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 #599FDB | 2.83:1 | Fails | Lc -59.5 | Large or bold text, headings |
| Black text on #599FDB | 7.40:1 | AAA | Lc 49.8 | Large or bold text, headings |
| #599FDB text on white | 2.83:1 | Fails | Lc 54.2 | Large or bold text, headings |
| #599FDB text on black | 7.40:1 | AAA | Lc -47.6 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C5DCF2
oklch(88.4% 0.039 247.1)
-
Step 300
300
#9BC6ED
oklch(80.9% 0.072 246.2)
-
Step 400
400 (this color)
#599FDB
oklch(68.2% 0.114 246.3)
-
Step 500
500
#2A8FDC
oklch(63.1% 0.146 246.6)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005287
oklch(42.6% 0.111 246.5)
-
Step 900
900
#044570
oklch(37.8% 0.094 245.6)
-
Step 950
950
#082842
oklch(26.9% 0.061 247.3)
#599FDB 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) | #85A1DE | 0.049 |
| Deuteranopia (no green cones) | #7494DA | 0.038 |
| Tritanopia (no blue cones) | #00ADB4 | 0.090 |
| Achromatopsia (no color) | #999999 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599FDB
#599FDB
oklch(68.2% 0.114 246.3)
- #C88A45
#C88A45
oklch(68.2% 0.114 66.7)
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 #599FDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.044
- Chefchaouen Blue #4895EF ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.057
- Faded Blue #658CBB ΔE 0.061
- Greyblue #77A1B5 ΔE 0.064
- Soft Blue #6488EA ΔE 0.070
- Turquoise Blue #06B1C4 ΔE 0.077
- Bluegrey #85A3B2 ΔE 0.078
Use #599FDB 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.