#2166BD
Closest named color: Mid Blue (#276AB3). oklch(51.6% 0.153 256.4), rgb(33, 102, 189).
Aa
White text reads best on this color (5.67:1).
About this color
#2166BD is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.153 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.021 away. White text reads best on it, at 5.67:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.70:1 |
| White text | 5.67:1 |
Values
| HEX | #2166BD |
| RGB | rgb(33, 102, 189) |
| HSL | hsl(213, 70%, 44%) |
| OKLCH | oklch(51.6% 0.153 256.4) |
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 #2166BD | 5.67:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #2166BD | 3.70:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #2166BD text on white | 5.67:1 | AA | Lc 77.9 | Fine for body text |
| #2166BD text on black | 3.70:1 | AA large text | Lc -23.9 | 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 700.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F0
oklch(80.9% 0.073 256.2)
-
Step 400
400
#6FA3E9
oklch(70.8% 0.117 256.1)
-
Step 500
500
#478AE3
oklch(63.2% 0.151 256.4)
-
Step 600
600
#2671D1
oklch(55.6% 0.165 256.6)
-
Step 700
700 (this color)
#2166BD
oklch(51.6% 0.153 256.4)
-
Step 800
800
#174E92
oklch(42.8% 0.126 256.1)
-
Step 900
900
#1A4175
oklch(37.7% 0.099 256.7)
-
Step 950
950
#102744
oklch(27.1% 0.062 255.3)
#2166BD 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) | #376EC0 | 0.030 |
| Deuteranopia (no green cones) | #0D60BB | 0.020 |
| Tritanopia (no blue cones) | #007B88 | 0.116 |
| Achromatopsia (no color) | #676767 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2166BD
#2166BD
oklch(51.6% 0.153 256.4)
- #8B5E00
#8B5E00
oklch(51.7% 0.108 76.3)
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 #2166BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.021
- French Blue #436BAD ΔE 0.042
- Windows Blue #3778BF ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.059
- Nice Blue #107AB0 ΔE 0.063
- Royal Blue #4169E1 ΔE 0.064
- Muted Blue #3B719F ΔE 0.065
- Ocean Blue #03719C ΔE 0.067
Use #2166BD 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.