#436FE1
Closest named color: Royal Blue (#4169E1). oklch(57.3% 0.18 265.2), rgb(67, 111, 225).
Aa
Black text reads best on this color (4.59:1).
About this color
#436FE1 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.180 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.015 away. Black text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.59:1 |
| White text | 4.56:1 |
Values
| HEX | #436FE1 |
| RGB | rgb(67, 111, 225) |
| HSL | hsl(223, 72%, 57%) |
| OKLCH | oklch(57.3% 0.18 265.2) |
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 #436FE1 | 4.56:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #436FE1 | 4.59:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #436FE1 text on white | 4.56:1 | AA | Lc 71.3 | Content text, not long reading |
| #436FE1 text on black | 4.59:1 | AA | Lc -30.4 | Non-text elements, placeholder text |
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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBD9F8
oklch(88.5% 0.045 266.2)
-
Step 300
300
#A7C0F6
oklch(80.8% 0.082 265.3)
-
Step 400
400
#799EF2
oklch(70.8% 0.13 265.2)
-
Step 500
500
#5883ED
oklch(63.1% 0.166 265.3)
-
Step 600
600 (this color)
#436FE1
oklch(57.3% 0.18 265.2)
-
Step 700
700
#3157BE
oklch(49% 0.168 265.3)
-
Step 800
800
#29489A
oklch(42.7% 0.139 265.3)
-
Step 900
900
#253D7A
oklch(37.6% 0.108 265.4)
-
Step 950
950
#162448
oklch(26.9% 0.07 265.9)
#436FE1 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) | #287DE5 | 0.037 |
| Deuteranopia (no green cones) | #006FDF | 0.035 |
| Tritanopia (no blue cones) | #008A9D | 0.146 |
| Achromatopsia (no color) | #767676 | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #436FE1
#436FE1
oklch(57.3% 0.18 265.2)
- #977200
#977200
oklch(57.3% 0.117 85.9)
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 #436FE1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.015
- Cerulean Blue #056EEE ΔE 0.038
- Neon Blue #4361EE ΔE 0.040
- Clear Blue #247AFD ΔE 0.049
- Dark Periwinkle #665FD1 ΔE 0.056
- Warm Blue #4B57DB ΔE 0.057
- Azul #1D5DEC ΔE 0.060
- Bright Blue #0165FC ΔE 0.061
Use #436FE1 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.