#3579E9
Closest named color: Clear Blue (#247AFD). oklch(59.4% 0.183 259.9), rgb(53, 121, 233).
Aa
Black text reads best on this color (5.06:1).
About this color
#3579E9 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.183 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.031 away. Black text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.06:1 |
| White text | 4.14:1 |
Values
| HEX | #3579E9 |
| RGB | rgb(53, 121, 233) |
| HSL | hsl(217, 80%, 56%) |
| OKLCH | oklch(59.4% 0.183 259.9) |
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 #3579E9 | 4.14:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #3579E9 | 5.06:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #3579E9 text on white | 4.14:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #3579E9 text on black | 5.06:1 | AA | Lc -33.6 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFB
oklch(88.4% 0.051 260.4)
-
Step 300
300
#9FC2FB
oklch(80.9% 0.09 260)
-
Step 400
400
#6AA0F9
oklch(70.7% 0.143 259.9)
-
Step 500
500 (this color)
#3579E9
oklch(59.4% 0.183 259.9)
-
Step 600
600
#1F6BE5
oklch(55.6% 0.199 260)
-
Step 700
700
#1158C7
oklch(49% 0.186 260.1)
-
Step 800
800
#1249A1
oklch(42.7% 0.154 260)
-
Step 900
900
#163E80
oklch(37.7% 0.12 260)
-
Step 950
950
#0E254B
oklch(27% 0.076 259.9)
#3579E9 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) | #3885ED | 0.032 |
| Deuteranopia (no green cones) | #0075E7 | 0.026 |
| Tritanopia (no blue cones) | #0094A6 | 0.142 |
| Achromatopsia (no color) | #7C7C7C | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3579E9
#3579E9
oklch(59.4% 0.183 259.9)
- #A47400
#A47400
oklch(59.2% 0.123 79.7)
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 #3579E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.031
- Cerulean Blue #056EEE ΔE 0.039
- Royal Blue #4169E1 ΔE 0.040
- Neon Blue #4361EE ΔE 0.058
- Cornflower #6A79F7 ΔE 0.059
- Dark Sky Blue #448EE4 ΔE 0.061
- Dodger Blue #1E90FF ΔE 0.063
- Soft Blue #6488EA ΔE 0.064
Use #3579E9 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.