#436CC9
Closest named color: Royal Blue (#4169E1). oklch(55% 0.152 264.2), rgb(67, 108, 201).
Aa
White text reads best on this color (4.96:1).
About this color
#436CC9 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.152 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.039 away. White text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.22:1 |
| White text | 4.96:1 |
Values
| HEX | #436CC9 |
| RGB | rgb(67, 108, 201) |
| HSL | hsl(222, 55%, 53%) |
| OKLCH | oklch(55% 0.152 264.2) |
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 #436CC9 | 4.96:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #436CC9 | 4.22:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #436CC9 text on white | 4.96:1 | AA | Lc 74.1 | Content text, not long reading |
| #436CC9 text on black | 4.22:1 | AA large text | Lc -27.6 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F3
oklch(88.4% 0.038 265.8)
-
Step 300
300
#ABC1EE
oklch(81% 0.068 264.5)
-
Step 400
400
#7E9FE5
oklch(70.6% 0.11 264.5)
-
Step 500
500
#5E86DD
oklch(63.1% 0.139 264.2)
-
Step 600
600 (this color)
#436CC9
oklch(55% 0.152 264.2)
-
Step 700
700
#365BB0
oklch(49% 0.142 264.2)
-
Step 800
800
#2D4B8E
oklch(42.7% 0.117 264)
-
Step 900
900
#283F72
oklch(37.7% 0.092 264.2)
-
Step 950
950
#182542
oklch(26.9% 0.057 264.6)
#436CC9 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) | #3D76CC | 0.026 |
| Deuteranopia (no green cones) | #236AC7 | 0.028 |
| Tritanopia (no blue cones) | #008291 | 0.125 |
| Achromatopsia (no color) | #707070 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #436CC9
#436CC9
oklch(55% 0.152 264.2)
- #906B00
#906B00
oklch(55% 0.113 84.6)
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 #436CC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.039
- Windows Blue #3778BF ΔE 0.039
- French Blue #436BAD ΔE 0.044
- Mid Blue #276AB3 ΔE 0.044
- Dark Periwinkle #665FD1 ΔE 0.053
- Iris #6258C4 ΔE 0.059
- Flat Blue #3C73A8 ΔE 0.059
- Warm Blue #4B57DB ΔE 0.060
Use #436CC9 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.