#3559CB
Closest named color: Warm Blue (#4B57DB). oklch(50.6% 0.182 266.5), rgb(53, 89, 203).
Aa
White text reads best on this color (6.09:1).
About this color
#3559CB is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.182 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.035 away. White text reads best on it, at 6.09:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.44:1 |
| White text | 6.09:1 |
Values
| HEX | #3559CB |
| RGB | rgb(53, 89, 203) |
| HSL | hsl(226, 59%, 50%) |
| OKLCH | oklch(50.6% 0.182 266.5) |
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 #3559CB | 6.09:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #3559CB | 3.44:1 | AA large text | Lc 24.1 | Dividers and decoration only |
| #3559CB text on white | 6.09:1 | AA | Lc 80.0 | Fine for body text |
| #3559CB text on black | 3.44:1 | AA large text | Lc -21.9 | 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 700.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A7C0FA
oklch(81% 0.087 266.4)
-
Step 400
400
#789CF8
oklch(70.6% 0.141 266.7)
-
Step 500
500
#5781F5
oklch(63.2% 0.18 266.4)
-
Step 600
600
#3E67E4
oklch(55.7% 0.195 266.3)
-
Step 700
700 (this color)
#3559CB
oklch(50.6% 0.182 266.5)
-
Step 800
800
#2946A0
oklch(42.8% 0.15 266.5)
-
Step 900
900
#253C7F
oklch(37.8% 0.117 266.5)
-
Step 950
950
#16244A
oklch(27.1% 0.073 266.4)
#3559CB 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) | #0069CF | 0.043 |
| Deuteranopia (no green cones) | #005BC9 | 0.028 |
| Tritanopia (no blue cones) | #007589 | 0.144 |
| Achromatopsia (no color) | #626262 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3559CB
#3559CB
oklch(50.6% 0.182 266.5)
- #7F6000
#7F6000
oklch(50.7% 0.104 86.5)
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 #3559CB, closest first.
No curated palette has a color within ΔE 0.04 of #3559CB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.035
- Azul #1D5DEC ΔE 0.053
- Royal Blue #4169E1 ΔE 0.054
- Iris #6258C4 ΔE 0.058
- Neon Blue #4361EE ΔE 0.060
- Blue Blue #2242C7 ΔE 0.060
- Mid Blue #276AB3 ΔE 0.062
- Dark Periwinkle #665FD1 ΔE 0.067
Use #3559CB 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.