#2166BE
Closest named color: Mid Blue (#276AB3). oklch(51.7% 0.154 256.6), rgb(33, 102, 190).
Aa
White text reads best on this color (5.66:1).
About this color
#2166BE is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.154 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.022 away. White text reads best on it, at 5.66:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.70:1 |
| White text | 5.66:1 |
Values
| HEX | #2166BE |
| RGB | rgb(33, 102, 190) |
| HSL | hsl(214, 70%, 44%) |
| OKLCH | oklch(51.7% 0.154 256.6) |
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 #2166BE | 5.66:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #2166BE | 3.70:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #2166BE text on white | 5.66:1 | AA | Lc 77.8 | Fine for body text |
| #2166BE 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
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F1
oklch(80.9% 0.075 256.7)
-
Step 400
400
#6EA2EA
oklch(70.6% 0.12 256.7)
-
Step 500
500
#4689E3
oklch(63% 0.152 256.6)
-
Step 600
600
#2671D1
oklch(55.6% 0.165 256.6)
-
Step 700
700 (this color)
#2166BE
oklch(51.7% 0.154 256.6)
-
Step 800
800
#174D93
oklch(42.6% 0.128 256.9)
-
Step 900
900
#1A4175
oklch(37.7% 0.099 256.7)
-
Step 950
950
#102645
oklch(26.9% 0.064 257.3)
#2166BE 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) | #366EC1 | 0.029 |
| Deuteranopia (no green cones) | #0860BC | 0.021 |
| Tritanopia (no blue cones) | #007B89 | 0.116 |
| Achromatopsia (no color) | #676767 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2166BE
#2166BE
oklch(51.7% 0.154 256.6)
- #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 #2166BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.022
- French Blue #436BAD ΔE 0.043
- Windows Blue #3778BF ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.060
- Royal Blue #4169E1 ΔE 0.062
- Nice Blue #107AB0 ΔE 0.064
- Muted Blue #3B719F ΔE 0.067
- Ocean Blue #03719C ΔE 0.069
Use #2166BE 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.