#436DA9
Closest named color: French Blue (#436BAD). oklch(53.2% 0.106 257.4), rgb(67, 109, 169).
Aa
White text reads best on this color (5.25:1).
About this color
#436DA9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.106 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.009 away. White text reads best on it, at 5.25:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.99:1 |
| White text | 5.25:1 |
Values
| HEX | #436DA9 |
| RGB | rgb(67, 109, 169) |
| HSL | hsl(215, 43%, 46%) |
| OKLCH | oklch(53.2% 0.106 257.4) |
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 #436DA9 | 5.25:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #436DA9 | 3.99:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #436DA9 text on white | 5.25:1 | AA | Lc 75.9 | Fine for body text |
| #436DA9 text on black | 3.99:1 | AA large text | Lc -25.8 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEB
oklch(88.4% 0.027 257)
-
Step 300
300
#AEC2E0
oklch(80.9% 0.048 258.4)
-
Step 400
400
#83A2D0
oklch(70.6% 0.076 258.1)
-
Step 500
500
#638BC4
oklch(63.1% 0.097 257.3)
-
Step 600
600 (this color)
#436DA9
oklch(53.2% 0.106 257.4)
-
Step 700
700
#3B6198
oklch(49.1% 0.099 257.6)
-
Step 800
800
#314F7B
oklch(42.6% 0.082 257.9)
-
Step 900
900
#2B4263
oklch(37.6% 0.064 257.4)
-
Step 950
950
#1A273A
oklch(27% 0.04 257.8)
#436DA9 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) | #5471AB | 0.024 |
| Deuteranopia (no green cones) | #4668A8 | 0.014 |
| Tritanopia (no blue cones) | #007B83 | 0.091 |
| Achromatopsia (no color) | #6C6C6C | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #436DA9
#436DA9
oklch(53.2% 0.106 257.4)
- #8E6310
#8E6310
oklch(53.2% 0.106 77.3)
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 #436DA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.009
- Flat Blue #3C73A8 ΔE 0.018
- Muted Blue #3B719F ΔE 0.023
- Mid Blue #276AB3 ΔE 0.031
- Dull Blue #49759C ΔE 0.036
- Windows Blue #3778BF ΔE 0.041
- Nice Blue #107AB0 ΔE 0.043
- Ocean Blue #03719C ΔE 0.046
Use #436DA9 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.