#436FA9
Closest named color: Flat Blue (#3C73A8). oklch(53.7% 0.104 255.9), rgb(67, 111, 169).
Aa
White text reads best on this color (5.14:1).
About this color
#436FA9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.104 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.013 away. White text reads best on it, at 5.14:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.08:1 |
| White text | 5.14:1 |
Values
| HEX | #436FA9 |
| RGB | rgb(67, 111, 169) |
| HSL | hsl(214, 43%, 46%) |
| OKLCH | oklch(53.7% 0.104 255.9) |
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 #436FA9 | 5.14:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #436FA9 | 4.08:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #436FA9 text on white | 5.14:1 | AA | Lc 75.3 | Fine for body text |
| #436FA9 text on black | 4.08:1 | AA large text | Lc -26.5 | 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
#ADC3DF
oklch(81% 0.046 254.5)
-
Step 400
400
#82A3CF
oklch(70.7% 0.074 255.8)
-
Step 500
500
#628BC3
oklch(63% 0.096 256.4)
-
Step 600
600 (this color)
#436FA9
oklch(53.7% 0.104 255.9)
-
Step 700
700
#3A6297
oklch(49.2% 0.097 256)
-
Step 800
800
#30507A
oklch(42.7% 0.08 255.7)
-
Step 900
900
#2B4362
oklch(37.8% 0.061 255.3)
-
Step 950
950
#19273A
oklch(27% 0.041 256.3)
#436FA9 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) | #5773AB | 0.027 |
| Deuteranopia (no green cones) | #4969A8 | 0.017 |
| Tritanopia (no blue cones) | #007C84 | 0.088 |
| Achromatopsia (no color) | #6D6D6D | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #436FA9
#436FA9
oklch(53.7% 0.104 255.9)
- #906417
#906417
oklch(53.7% 0.104 75.8)
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 #436FA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.013
- French Blue #436BAD ΔE 0.014
- Muted Blue #3B719F ΔE 0.020
- Dull Blue #49759C ΔE 0.031
- Mid Blue #276AB3 ΔE 0.034
- Windows Blue #3778BF ΔE 0.038
- Nice Blue #107AB0 ΔE 0.039
- Cerulean #457B9D ΔE 0.044
Use #436FA9 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.