#216CDF
Closest named color: Cerulean Blue (#056EEE). oklch(55.4% 0.19 259.4), rgb(33, 108, 223).
Aa
White text reads best on this color (4.91:1).
About this color
#216CDF is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.190 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.024 away. White text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.190) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.27:1 |
| White text | 4.91:1 |
Values
| HEX | #216CDF |
| RGB | rgb(33, 108, 223) |
| HSL | hsl(216, 75%, 50%) |
| OKLCH | oklch(55.4% 0.19 259.4) |
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 #216CDF | 4.91:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #216CDF | 4.27:1 | AA large text | Lc 30.7 | Non-text elements, placeholder text |
| #216CDF text on white | 4.91:1 | AA | Lc 73.4 | Content text, not long reading |
| #216CDF text on black | 4.27:1 | AA large text | Lc -28.3 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A0C2F8
oklch(80.9% 0.085 259.5)
-
Step 400
400
#6CA0F5
oklch(70.6% 0.137 259.8)
-
Step 500
500
#4386F1
oklch(63.1% 0.175 259.4)
-
Step 600
600 (this color)
#216CDF
oklch(55.4% 0.19 259.4)
-
Step 700
700
#145AC2
oklch(49.1% 0.176 259.3)
-
Step 800
800
#144A9D
oklch(42.6% 0.146 259.4)
-
Step 900
900
#183F7D
oklch(37.7% 0.114 259.5)
-
Step 950
950
#0F2549
oklch(26.9% 0.073 259.8)
#216CDF 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) | #1879E3 | 0.033 |
| Deuteranopia (no green cones) | #0069DD | 0.015 |
| Tritanopia (no blue cones) | #00889B | 0.145 |
| Achromatopsia (no color) | #717171 | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #216CDF
#216CDF
oklch(55.4% 0.19 259.4)
- #966900
#966900
oklch(55.3% 0.115 79.1)
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 #216CDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.024
- Royal Blue #4169E1 ΔE 0.024
- Neon Blue #4361EE ΔE 0.042
- Azul #1D5DEC ΔE 0.042
- Bright Blue #0165FC ΔE 0.049
- Warm Blue #4B57DB ΔE 0.055
- Clear Blue #247AFD ΔE 0.056
- Windows Blue #3778BF ΔE 0.065
Use #216CDF 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.