#579CDB
Closest named color: Cornflower Blue (#6495ED). oklch(67.4% 0.117 247.9), rgb(87, 156, 219).
Aa
Black text reads best on this color (7.18:1).
About this color
#579CDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.117 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.039 away. Black text reads best on it, at 7.18:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.18:1 |
| White text | 2.92:1 |
Values
| HEX | #579CDB |
| RGB | rgb(87, 156, 219) |
| HSL | hsl(209, 65%, 60%) |
| OKLCH | oklch(67.4% 0.117 247.9) |
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 #579CDB | 2.92:1 | Fails | Lc -60.8 | Content text, not long reading |
| Black text on #579CDB | 7.18:1 | AAA | Lc 48.6 | Large or bold text, headings |
| #579CDB text on white | 2.92:1 | Fails | Lc 55.4 | Large or bold text, headings |
| #579CDB text on black | 7.18:1 | AAA | Lc -46.4 | 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
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C5DCF3
oklch(88.5% 0.04 248.3)
-
Step 300
300
#9BC5EE
oklch(80.8% 0.073 248.1)
-
Step 400
400 (this color)
#579CDB
oklch(67.4% 0.117 247.9)
-
Step 500
500
#2B8EDF
oklch(63% 0.151 248.2)
-
Step 600
600
#0077C5
oklch(55.6% 0.149 247.9)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#054472
oklch(37.7% 0.097 247.7)
-
Step 950
950
#082843
oklch(27% 0.062 248.2)
#579CDB 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) | #819EDE | 0.047 |
| Deuteranopia (no green cones) | #6F91DA | 0.036 |
| Tritanopia (no blue cones) | #00ABB2 | 0.094 |
| Achromatopsia (no color) | #979797 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #579CDB
#579CDB
oklch(67.4% 0.117 247.9)
- #C6883E
#C6883E
oklch(67.5% 0.117 68.1)
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 #579CDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.039
- Chefchaouen Blue #4895EF ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.048
- Faded Blue #658CBB ΔE 0.056
- Soft Blue #6488EA ΔE 0.063
- Greyblue #77A1B5 ΔE 0.069
- Dodger Blue #1E90FF ΔE 0.077
- Silver Lake Blue #778DA9 ΔE 0.078
Use #579CDB 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.