#579FCB
Closest named color: Greyblue (#77A1B5). oklch(67.3% 0.097 237.4), rgb(87, 159, 203).
Aa
Black text reads best on this color (7.22:1).
About this color
#579FCB is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.097 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.046 away. Black text reads best on it, at 7.22:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.22:1 |
| White text | 2.90:1 |
Values
| HEX | #579FCB |
| RGB | rgb(87, 159, 203) |
| HSL | hsl(203, 53%, 57%) |
| OKLCH | oklch(67.3% 0.097 237.4) |
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 #579FCB | 2.90:1 | Fails | Lc -60.5 | Content text, not long reading |
| Black text on #579FCB | 7.22:1 | AAA | Lc 48.8 | Large or bold text, headings |
| #579FCB text on white | 2.90:1 | Fails | Lc 55.2 | Large or bold text, headings |
| #579FCB text on black | 7.22:1 | AAA | Lc -46.6 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C5DDED
oklch(88.5% 0.034 237)
-
Step 300
300
#9CC7E4
oklch(80.9% 0.061 238)
-
Step 400
400 (this color)
#579FCB
oklch(67.3% 0.097 237.4)
-
Step 500
500
#2993CB
oklch(63% 0.125 237.4)
-
Step 600
600
#007CB2
oklch(55.6% 0.123 237.7)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#034767
oklch(37.7% 0.081 237.2)
-
Step 950
950
#082A3C
oklch(27.1% 0.051 236.4)
#579FCB 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) | #8B9ECD | 0.058 |
| Deuteranopia (no green cones) | #7B92CA | 0.049 |
| Tritanopia (no blue cones) | #00AAAE | 0.073 |
| Achromatopsia (no color) | #979797 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #579FCB
#579FCB
oklch(67.3% 0.097 237.4)
- #C48758
#C48758
oklch(67.5% 0.098 57.7)
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 #579FCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.046
- Faded Blue #658CBB ΔE 0.052
- Turquoise Blue #06B1C4 ΔE 0.062
- Bluegrey #85A3B2 ΔE 0.063
- Silver Lake Blue #778DA9 ΔE 0.064
- Cadet Blue #5F9EA0 ΔE 0.064
- Cornflower Blue #6495ED ΔE 0.066
- Bluey Grey #89A0B0 ΔE 0.066
Use #579FCB 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.