#2166EA
Closest named color: Cerulean Blue (#056EEE). oklch(55% 0.211 261.7), rgb(33, 102, 234).
Aa
White text reads best on this color (5.05:1).
About this color
#2166EA is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.211 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.020 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.211) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #2166EA |
| RGB | rgb(33, 102, 234) |
| HSL | hsl(219, 83%, 52%) |
| OKLCH | oklch(55% 0.211 261.7) |
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 #2166EA | 5.05:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #2166EA | 4.15:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #2166EA text on white | 5.05:1 | AA | Lc 74.2 | Content text, not long reading |
| #2166EA text on black | 4.15:1 | AA large text | Lc -27.5 | 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
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C6DAFD
oklch(88.5% 0.053 261.7)
-
Step 300
300
#9FC1FF
oklch(80.9% 0.096 262.2)
-
Step 400
400
#6A9EFF
oklch(70.6% 0.153 261.9)
-
Step 500
500
#4282FD
oklch(63% 0.195 261.8)
-
Step 600
600 (this color)
#2166EA
oklch(55% 0.211 261.7)
-
Step 700
700
#1655CD
oklch(49% 0.196 261.8)
-
Step 800
800
#1547A6
oklch(42.8% 0.162 261.7)
-
Step 900
900
#183D84
oklch(37.8% 0.127 261.8)
-
Step 950
950
#0F244D
oklch(27% 0.081 262.1)
#2166EA 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) | #0078EF | 0.043 |
| Deuteranopia (no green cones) | #0066E7 | 0.012 |
| Tritanopia (no blue cones) | #00879E | 0.161 |
| Achromatopsia (no color) | #6F6F6F | 0.211 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2166EA
#2166EA
oklch(55% 0.211 261.7)
- #936A00
#936A00
oklch(55.2% 0.114 81.8)
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 #2166EA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.020
- Azul #1D5DEC ΔE 0.022
- Neon Blue #4361EE ΔE 0.028
- Bright Blue #0165FC ΔE 0.029
- Royal Blue #4169E1 ΔE 0.030
- Warm Blue #4B57DB ΔE 0.049
- Electric Blue #0652FF ΔE 0.056
- Clear Blue #247AFD ΔE 0.056
Use #2166EA 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.