#436EA4
Closest named color: Flat Blue (#3C73A8). oklch(53.2% 0.098 254.9), rgb(67, 110, 164).
Aa
White text reads best on this color (5.24:1).
About this color
#436EA4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.098 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.015 away. White text reads best on it, at 5.24:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #436EA4 |
| RGB | rgb(67, 110, 164) |
| HSL | hsl(213, 42%, 45%) |
| OKLCH | oklch(53.2% 0.098 254.9) |
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 #436EA4 | 5.24:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #436EA4 | 4.00:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #436EA4 text on white | 5.24:1 | AA | Lc 75.9 | Fine for body text |
| #436EA4 text on black | 4.00:1 | AA large text | Lc -25.9 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EAF2
oklch(93.5% 0.013 255.5)
-
Step 200
200
#CFDAEA
oklch(88.5% 0.025 257.6)
-
Step 300
300
#AEC3DD
oklch(81% 0.043 253.8)
-
Step 400
400
#83A3CC
oklch(70.7% 0.07 254.8)
-
Step 500
500
#638CBF
oklch(63.1% 0.09 254.4)
-
Step 600
600 (this color)
#436EA4
oklch(53.2% 0.098 254.9)
-
Step 700
700
#3B6293
oklch(49% 0.091 254.9)
-
Step 800
800
#315078
oklch(42.6% 0.076 255.4)
-
Step 900
900
#2B4360
oklch(37.7% 0.058 253.8)
-
Step 950
950
#1A2738
oklch(26.9% 0.037 255.4)
#436EA4 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) | #5871A6 | 0.027 |
| Deuteranopia (no green cones) | #4B68A3 | 0.018 |
| Tritanopia (no blue cones) | #007A81 | 0.084 |
| Achromatopsia (no color) | #6C6C6C | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #436EA4
#436EA4
oklch(53.2% 0.098 254.9)
- #8D631F
#8D631F
oklch(53.1% 0.098 75.1)
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 #436EA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.015
- Muted Blue #3B719F ΔE 0.015
- French Blue #436BAD ΔE 0.018
- Dull Blue #49759C ΔE 0.028
- Mid Blue #276AB3 ΔE 0.037
- Ocean Blue #03719C ΔE 0.041
- Nice Blue #107AB0 ΔE 0.042
- Cerulean #457B9D ΔE 0.043
Use #436EA4 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.