#3579AF
Closest named color: Flat Blue (#3C73A8). oklch(55.7% 0.108 245.6), rgb(53, 121, 175).
Aa
White text reads best on this color (4.66:1).
About this color
#3579AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.108 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.018 away. White text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.50:1 |
| White text | 4.66:1 |
Values
| HEX | #3579AF |
| RGB | rgb(53, 121, 175) |
| HSL | hsl(207, 54%, 45%) |
| OKLCH | oklch(55.7% 0.108 245.6) |
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 #3579AF | 4.66:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #3579AF | 4.50:1 | AA | Lc 32.0 | Non-text elements, placeholder text |
| #3579AF text on white | 4.66:1 | AA | Lc 72.1 | Content text, not long reading |
| #3579AF text on black | 4.50:1 | AA | Lc -29.6 | Dividers and decoration only |
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 600.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CBDBEA
oklch(88.4% 0.027 246.4)
-
Step 300
300
#A7C5DF
oklch(81% 0.049 244.6)
-
Step 400
400
#77A6CF
oklch(70.7% 0.079 245.5)
-
Step 500
500
#528FC2
oklch(63% 0.1 245.5)
-
Step 600
600 (this color)
#3579AF
oklch(55.7% 0.108 245.6)
-
Step 700
700
#266596
oklch(49% 0.101 245.6)
-
Step 800
800
#22537A
oklch(42.8% 0.084 245.6)
-
Step 900
900
#214562
oklch(37.8% 0.065 245.1)
-
Step 950
950
#142839
oklch(26.9% 0.041 245.8)
#3579AF 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) | #617BB1 | 0.047 |
| Deuteranopia (no green cones) | #506FAE | 0.035 |
| Tritanopia (no blue cones) | #00868C | 0.080 |
| Achromatopsia (no color) | #747474 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3579AF
#3579AF
oklch(55.7% 0.108 245.6)
- #9E6522
#9E6522
oklch(55.7% 0.108 65.9)
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 #3579AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.018
- Nice Blue #107AB0 ΔE 0.018
- Windows Blue #3778BF ΔE 0.026
- Muted Blue #3B719F ΔE 0.030
- Steel Blue #4682B4 ΔE 0.032
- Dull Blue #49759C ΔE 0.032
- Cerulean #457B9D ΔE 0.033
- Cool Blue #4984B8 ΔE 0.039
Use #3579AF 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.