#436CCB
Closest named color: Royal Blue (#4169E1). oklch(55.1% 0.154 264.4), rgb(67, 108, 203).
Aa
White text reads best on this color (4.94:1).
About this color
#436CCB is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.154 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.036 away. White text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.24:1 |
| White text | 4.94:1 |
Values
| HEX | #436CCB |
| RGB | rgb(67, 108, 203) |
| HSL | hsl(222, 57%, 53%) |
| OKLCH | oklch(55.1% 0.154 264.4) |
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 #436CCB | 4.94:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #436CCB | 4.24:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #436CCB text on white | 4.94:1 | AA | Lc 73.9 | Content text, not long reading |
| #436CCB text on black | 4.24:1 | AA large text | Lc -27.8 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCD9F3
oklch(88.4% 0.039 264.4)
-
Step 300
300
#AAC1EE
oklch(80.9% 0.069 263.7)
-
Step 400
400
#7E9FE6
oklch(70.7% 0.111 264.7)
-
Step 500
500
#5D86DF
oklch(63.2% 0.142 264.1)
-
Step 600
600 (this color)
#436CCB
oklch(55.1% 0.154 264.4)
-
Step 700
700
#365BB1
oklch(49.1% 0.143 264.3)
-
Step 800
800
#2D4B8F
oklch(42.7% 0.118 264.1)
-
Step 900
900
#283F72
oklch(37.7% 0.092 264.2)
-
Step 950
950
#182543
oklch(27% 0.059 265)
#436CCB 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) | #3B77CF | 0.029 |
| Deuteranopia (no green cones) | #1F6AC9 | 0.030 |
| Tritanopia (no blue cones) | #008292 | 0.126 |
| Achromatopsia (no color) | #707070 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #436CCB
#436CCB
oklch(55.1% 0.154 264.4)
- #916B00
#916B00
oklch(55.1% 0.113 83.9)
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 #436CCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.036
- Windows Blue #3778BF ΔE 0.041
- Mid Blue #276AB3 ΔE 0.046
- French Blue #436BAD ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.052
- Warm Blue #4B57DB ΔE 0.058
- Iris #6258C4 ΔE 0.059
- Cerulean Blue #056EEE ΔE 0.061
Use #436CCB 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.