#436ECB
Closest named color: Windows Blue (#3778BF). oklch(55.5% 0.152 263.6), rgb(67, 110, 203).
Aa
White text reads best on this color (4.84:1).
About this color
#436ECB is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.152 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.036 away. White text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.33:1 |
| White text | 4.84:1 |
Values
| HEX | #436ECB |
| RGB | rgb(67, 110, 203) |
| HSL | hsl(221, 57%, 53%) |
| OKLCH | oklch(55.5% 0.152 263.6) |
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 #436ECB | 4.84:1 | AA | Lc -78.7 | Fine for body text |
| Black text on #436ECB | 4.33:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #436ECB text on white | 4.84:1 | AA | Lc 73.3 | Content text, not long reading |
| #436ECB text on black | 4.33:1 | AA large text | Lc -28.4 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#AAC1EE
oklch(80.9% 0.069 263.7)
-
Step 400
400
#7DA0E5
oklch(70.8% 0.109 263.3)
-
Step 500
500
#5D86DE
oklch(63.1% 0.141 264)
-
Step 600
600 (this color)
#436ECB
oklch(55.5% 0.152 263.6)
-
Step 700
700
#355CB0
oklch(49.2% 0.141 263.4)
-
Step 800
800
#2C4B8E
oklch(42.6% 0.117 263.5)
-
Step 900
900
#283F72
oklch(37.7% 0.092 264.2)
-
Step 950
950
#172543
oklch(26.9% 0.059 264)
#436ECB 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) | #3F78CE | 0.026 |
| Deuteranopia (no green cones) | #256CC9 | 0.026 |
| Tritanopia (no blue cones) | #008492 | 0.126 |
| Achromatopsia (no color) | #717171 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #436ECB
#436ECB
oklch(55.5% 0.152 263.6)
- #936C00
#936C00
oklch(55.6% 0.114 83.5)
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 #436ECB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- Royal Blue #4169E1 ΔE 0.038
- French Blue #436BAD ΔE 0.047
- Mid Blue #276AB3 ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.060
- Cerulean Blue #056EEE ΔE 0.061
- Iris #6258C4 ΔE 0.062
Use #436ECB 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.