#436CA5
Closest named color: French Blue (#436BAD). oklch(52.8% 0.102 256.9), rgb(67, 108, 165).
Aa
White text reads best on this color (5.34:1).
About this color
#436CA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.102 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.014 away. White text reads best on it, at 5.34:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.92:1 |
| White text | 5.34:1 |
Values
| HEX | #436CA5 |
| RGB | rgb(67, 108, 165) |
| HSL | hsl(215, 42%, 45%) |
| OKLCH | oklch(52.8% 0.102 256.9) |
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 #436CA5 | 5.34:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #436CA5 | 3.92:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #436CA5 text on white | 5.34:1 | AA | Lc 76.5 | Fine for body text |
| #436CA5 text on black | 3.92:1 | AA large text | Lc -25.3 | 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
#CFDAEA
oklch(88.5% 0.025 257.6)
-
Step 300
300
#AEC2DF
oklch(80.8% 0.047 257.6)
-
Step 400
400
#83A3CE
oklch(70.7% 0.073 255.9)
-
Step 500
500
#648BC2
oklch(63.1% 0.094 257)
-
Step 600
600 (this color)
#436CA5
oklch(52.8% 0.102 256.9)
-
Step 700
700
#3C6196
oklch(49% 0.096 257.4)
-
Step 800
800
#325079
oklch(42.8% 0.077 256.5)
-
Step 900
900
#2C4262
oklch(37.6% 0.062 257.7)
-
Step 950
950
#1A2739
oklch(27% 0.038 256.7)
#436CA5 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) | #5470A7 | 0.024 |
| Deuteranopia (no green cones) | #4867A4 | 0.014 |
| Tritanopia (no blue cones) | #007981 | 0.087 |
| Achromatopsia (no color) | #6B6B6B | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #436CA5
#436CA5
oklch(52.8% 0.102 256.9)
- #8C6217
#8C6217
oklch(52.8% 0.102 76.5)
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 #436CA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.014
- Flat Blue #3C73A8 ΔE 0.020
- Muted Blue #3B719F ΔE 0.020
- Mid Blue #276AB3 ΔE 0.033
- Dull Blue #49759C ΔE 0.034
- Dusky Blue #475F94 ΔE 0.041
- Ocean Blue #03719C ΔE 0.043
- Denim #3B638C ΔE 0.046
Use #436CA5 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.