#2166DE
Closest named color: Royal Blue (#4169E1). oklch(54.1% 0.196 260.8), rgb(33, 102, 222).
Aa
White text reads best on this color (5.22:1).
About this color
#2166DE is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.196 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.028 away. White text reads best on it, at 5.22:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.02:1 |
| White text | 5.22:1 |
Values
| HEX | #2166DE |
| RGB | rgb(33, 102, 222) |
| HSL | hsl(218, 74%, 50%) |
| OKLCH | oklch(54.1% 0.196 260.8) |
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 #2166DE | 5.22:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #2166DE | 4.02:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #2166DE text on white | 5.22:1 | AA | Lc 75.3 | Fine for body text |
| #2166DE text on black | 4.02:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A0C2FA
oklch(80.9% 0.088 260.2)
-
Step 400
400
#6DA0F8
oklch(70.8% 0.141 260.7)
-
Step 500
500
#4585F5
oklch(63.2% 0.18 260.7)
-
Step 600
600 (this color)
#2166DE
oklch(54.1% 0.196 260.8)
-
Step 700
700
#1958C6
oklch(49.1% 0.183 260.9)
-
Step 800
800
#1749A0
oklch(42.7% 0.151 260.8)
-
Step 900
900
#193E7F
oklch(37.7% 0.118 260.7)
-
Step 950
950
#10254A
oklch(27% 0.074 260.8)
#2166DE 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) | #0075E2 | 0.037 |
| Deuteranopia (no green cones) | #0064DC | 0.014 |
| Tritanopia (no blue cones) | #008498 | 0.150 |
| Achromatopsia (no color) | #6C6C6C | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2166DE
#2166DE
oklch(54.1% 0.196 260.8)
- #906600
#906600
oklch(54% 0.112 80.3)
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 #2166DE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.028
- Cerulean Blue #056EEE ΔE 0.030
- Azul #1D5DEC ΔE 0.031
- Neon Blue #4361EE ΔE 0.038
- Warm Blue #4B57DB ΔE 0.046
- Bright Blue #0165FC ΔE 0.046
- Clear Blue #247AFD ΔE 0.067
- Electric Blue #0652FF ΔE 0.068
Use #2166DE 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.